diff --git a/internal/jet/cast.go b/internal/jet/cast.go
index 4c05f76..b7768af 100644
--- a/internal/jet/cast.go
+++ b/internal/jet/cast.go
@@ -1,17 +1,7 @@
 package jet
 
-import "strconv"
-
 type Cast interface {
 	AS(castType string) Expression
-
-	AS_CHAR(lenght ...int) StringExpression
-	// Cast expression AS date type
-	AS_DATE() DateExpression
-	// Cast expression AS numeric type, using precision and optionally scale
-	AS_DECIMAL() FloatExpression
-	// Cast expression AS time type
-	AS_TIME() TimeExpression
 }
 
 type CastImpl struct {
@@ -37,29 +27,6 @@ func (b *CastImpl) AS(castType string) Expression {
 	return castExp
 }
 
-func (b *CastImpl) AS_CHAR(lenght ...int) StringExpression {
-	if len(lenght) > 0 {
-		return StringExp(b.AS("CHAR(" + strconv.Itoa(lenght[0]) + ")"))
-	}
-
-	return StringExp(b.AS("CHAR"))
-}
-
-// Cast expression AS date type
-func (b *CastImpl) AS_DATE() DateExpression {
-	return DateExp(b.AS("DATE"))
-}
-
-// Cast expression AS date type
-func (b *CastImpl) AS_DECIMAL() FloatExpression {
-	return FloatExp(b.AS("DECIMAL"))
-}
-
-// Cast expression AS date type
-func (b *CastImpl) AS_TIME() TimeExpression {
-	return TimeExp(b.AS("TIME"))
-}
-
 type castExpression struct {
 	ExpressionInterfaceImpl
 
diff --git a/internal/jet/literal_expression.go b/internal/jet/literal_expression.go
index 1ba06c3..a5fbbaa 100644
--- a/internal/jet/literal_expression.go
+++ b/internal/jet/literal_expression.go
@@ -2,11 +2,10 @@ package jet
 
 import (
 	"fmt"
-	"strconv"
 	"time"
 )
 
-// Representation of an escaped literal
+// LiteralExpression is representation of an escaped literal
 type LiteralExpression interface {
 	Expression
 
@@ -129,76 +128,149 @@ func String(value string, constant ...bool) StringExpression {
 	return &stringLiteral
 }
 
-func formatMilliseconds(milliseconds ...int) string {
-	if len(milliseconds) > 0 {
-		if milliseconds[0] < 1000 {
-			return fmt.Sprintf(".%03d", milliseconds[0])
-		} else {
-			return "." + strconv.Itoa(milliseconds[0])
-		}
-	}
+//---------------------------------------------------//
 
-	return ""
+type timeLiteral struct {
+	timeInterfaceImpl
+	literalExpressionImpl
 }
 
 // Time creates new time literal expression
-func Time(hour, minute, second int, milliseconds ...int) TimeExpression {
+func Time(hour, minute, second int, nanoseconds ...time.Duration) TimeExpression {
+	timeLiteral := &timeLiteral{}
 	timeStr := fmt.Sprintf("%02d:%02d:%02d", hour, minute, second)
+	timeStr += formatNanoseconds(nanoseconds...)
+	timeLiteral.literalExpressionImpl = *literal(timeStr)
 
-	timeStr += formatMilliseconds(milliseconds...)
+	timeLiteral.timeInterfaceImpl.parent = timeLiteral
 
-	return TimeExp(literal(timeStr))
+	return timeLiteral
 }
 
 func TimeT(t time.Time) TimeExpression {
-	return TimeExp(literal(t))
+	timeLiteral := &timeLiteral{}
+	timeLiteral.literalExpressionImpl = *literal(t)
+	timeLiteral.timeInterfaceImpl.parent = timeLiteral
+
+	return timeLiteral
+}
+
+//---------------------------------------------------//
+
+type timezLiteral struct {
+	timezInterfaceImpl
+	literalExpressionImpl
 }
 
 // Timez creates new time with time zone literal expression
-func Timez(hour, minute, second, milliseconds, timezone int) TimezExpression {
-	timeStr := fmt.Sprintf("%02d:%02d:%02d.%03d %+03d", hour, minute, second, milliseconds, timezone)
+func Timez(hour, minute, second int, nanoseconds time.Duration, timezone string) TimezExpression {
+	timezLiteral := timezLiteral{}
+	timeStr := fmt.Sprintf("%02d:%02d:%02d", hour, minute, second)
+	timeStr += formatNanoseconds(nanoseconds)
+	timeStr += " " + timezone
+	timezLiteral.literalExpressionImpl = *literal(timeStr)
 
 	return TimezExp(literal(timeStr))
 }
 
 func TimezT(t time.Time) TimezExpression {
-	return TimezExp(literal(t))
+	timeLiteral := &timezLiteral{}
+	timeLiteral.literalExpressionImpl = *literal(t)
+	timeLiteral.timezInterfaceImpl.parent = timeLiteral
+
+	return timeLiteral
+}
+
+//---------------------------------------------------//
+
+type timestampLiteral struct {
+	timestampInterfaceImpl
+	literalExpressionImpl
 }
 
 // Timestamp creates new timestamp literal expression
-func Timestamp(year int, month time.Month, day, hour, minute, second int, milliseconds ...int) TimestampExpression {
+func Timestamp(year int, month time.Month, day, hour, minute, second int, nanoseconds ...time.Duration) TimestampExpression {
+	timestamp := &timestampLiteral{}
 	timeStr := fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d", year, month, day, hour, minute, second)
-
-	timeStr += formatMilliseconds(milliseconds...)
-
-	return TimestampExp(literal(timeStr))
+	timeStr += formatNanoseconds(nanoseconds...)
+	timestamp.literalExpressionImpl = *literal(timeStr)
+	timestamp.timestampInterfaceImpl.parent = timestamp
+	return timestamp
 }
 
 func TimestampT(t time.Time) TimestampExpression {
-	return TimestampExp(literal(t))
+	timestamp := &timestampLiteral{}
+	timestamp.literalExpressionImpl = *literal(t)
+	timestamp.timestampInterfaceImpl.parent = timestamp
+	return timestamp
 }
 
-// Timestampz creates new timestamp with time zone literal expression
-func Timestampz(year, month, day, hour, minute, second, milliseconds, timezone int) TimestampzExpression {
-	timeStr := fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d.%03d %+04d",
-		year, month, day, hour, minute, second, milliseconds, timezone)
+//---------------------------------------------------//
 
-	return TimestampzExp(literal(timeStr))
+type timestampzLiteral struct {
+	timestampzInterfaceImpl
+	literalExpressionImpl
+}
+
+// Timestamp creates new timestamp literal expression
+func Timestampz(year int, month time.Month, day, hour, minute, second int, nanoseconds time.Duration, timezone string) TimestampzExpression {
+	timestamp := &timestampzLiteral{}
+	timeStr := fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d", year, month, day, hour, minute, second)
+	timeStr += formatNanoseconds(nanoseconds)
+	timeStr += " " + timezone
+
+	timestamp.literalExpressionImpl = *literal(timeStr)
+	timestamp.timestampzInterfaceImpl.parent = timestamp
+	return timestamp
 }
 
 func TimestampzT(t time.Time) TimestampzExpression {
-	return TimestampzExp(literal(t))
+	timestamp := &timestampzLiteral{}
+	timestamp.literalExpressionImpl = *literal(t)
+	timestamp.timestampzInterfaceImpl.parent = timestamp
+	return timestamp
+}
+
+//---------------------------------------------------//
+
+type dateLiteral struct {
+	dateInterfaceImpl
+	literalExpressionImpl
 }
 
 //Date creates new date expression
 func Date(year int, month time.Month, day int) DateExpression {
-	timeStr := fmt.Sprintf("%04d-%02d-%02d", year, month, day)
+	dateLiteral := &dateLiteral{}
 
-	return DateExp(literal(timeStr))
+	timeStr := fmt.Sprintf("%04d-%02d-%02d", year, month, day)
+	dateLiteral.literalExpressionImpl = *literal(timeStr)
+	dateLiteral.dateInterfaceImpl.parent = dateLiteral
+
+	return dateLiteral
 }
 
 func DateT(t time.Time) DateExpression {
-	return DateExp(literal(t))
+	dateLiteral := &dateLiteral{}
+	dateLiteral.literalExpressionImpl = *literal(t)
+	dateLiteral.dateInterfaceImpl.parent = dateLiteral
+
+	return dateLiteral
+}
+
+func formatNanoseconds(nanoseconds ...time.Duration) string {
+	if len(nanoseconds) > 0 && nanoseconds[0] != 0 {
+		duration := fmt.Sprintf("%09d", nanoseconds[0])
+		i := len(duration) - 1
+		for ; i >= 3; i-- {
+			if duration[i] != '0' {
+				break
+			}
+		}
+
+		return "." + duration[0:i+1]
+	}
+
+	return ""
 }
 
 //--------------------------------------------------//
diff --git a/internal/jet/literal_expression_test.go b/internal/jet/literal_expression_test.go
index 0b671d5..5142f27 100644
--- a/internal/jet/literal_expression_test.go
+++ b/internal/jet/literal_expression_test.go
@@ -12,3 +12,49 @@ func TestRawExpression(t *testing.T) {
 
 	assertClauseSerialize(t, DateT(timeT), "$1", timeT)
 }
+
+func TestTimeLiteral(t *testing.T) {
+	assertClauseDebugSerialize(t, Time(11, 5, 30), "'11:05:30'")
+	assertClauseDebugSerialize(t, Time(11, 5, 30, 0), "'11:05:30'")
+	assertClauseDebugSerialize(t, Time(11, 5, 30, 3*time.Millisecond), "'11:05:30.003'")
+	assertClauseDebugSerialize(t, Time(11, 5, 30, 30*time.Millisecond), "'11:05:30.030'")
+	assertClauseDebugSerialize(t, Time(11, 5, 30, 300*time.Millisecond), "'11:05:30.300'")
+	assertClauseDebugSerialize(t, Time(11, 5, 30, 300*time.Microsecond), "'11:05:30.0003'")
+	assertClauseDebugSerialize(t, Time(11, 5, 30, 4*time.Nanosecond), "'11:05:30.000000004'")
+}
+
+func TestTimeT(t *testing.T) {
+	timeT := time.Date(2000, 1, 1, 11, 40, 20, 124, time.UTC)
+	assertClauseDebugSerialize(t, TimeT(timeT), `'2000-01-01 11:40:20.000000124Z'`)
+}
+
+func TestTimezLiteral(t *testing.T) {
+	assertClauseDebugSerialize(t, Timez(11, 5, 30, 10*time.Nanosecond, "UTC"), "'11:05:30.00000001 UTC'")
+	assertClauseDebugSerialize(t, Timez(11, 5, 30, 0, "+1"), "'11:05:30 +1'")
+	assertClauseDebugSerialize(t, Timez(11, 5, 30, 3*time.Microsecond, "-7"), "'11:05:30.000003 -7'")
+	assertClauseDebugSerialize(t, Timez(11, 5, 30, 30*time.Millisecond, "+8:00"), "'11:05:30.030 +8:00'")
+	assertClauseDebugSerialize(t, Timez(11, 5, 30, 300*time.Nanosecond, "America/New_Yor"), "'11:05:30.0000003 America/New_Yor'")
+	assertClauseDebugSerialize(t, Timez(11, 5, 30, 3000*time.Nanosecond, "zulu"), "'11:05:30.000003 zulu'")
+}
+
+func TestTimestampLiteral(t *testing.T) {
+	assertClauseDebugSerialize(t, Timestamp(2011, 1, 8, 11, 5, 30), "'2011-01-08 11:05:30'")
+	assertClauseDebugSerialize(t, Timestamp(2011, 2, 7, 11, 5, 30, 0), "'2011-02-07 11:05:30'")
+	assertClauseDebugSerialize(t, Timestamp(2011, 3, 6, 11, 5, 30, 3*time.Millisecond), "'2011-03-06 11:05:30.003'")
+	assertClauseDebugSerialize(t, Timestamp(2011, 4, 5, 11, 5, 30, 30*time.Millisecond), "'2011-04-05 11:05:30.030'")
+	assertClauseDebugSerialize(t, Timestamp(2011, 5, 4, 11, 5, 30, 300*time.Millisecond), "'2011-05-04 11:05:30.300'")
+	assertClauseDebugSerialize(t, Timestamp(2011, 6, 3, 11, 5, 30, 3000*time.Microsecond), "'2011-06-03 11:05:30.003'")
+}
+
+func TestTimestampzLiteral(t *testing.T) {
+	assertClauseDebugSerialize(t, Timestampz(2011, 1, 8, 11, 5, 30, 0, "UTC"), "'2011-01-08 11:05:30 UTC'")
+	assertClauseDebugSerialize(t, Timestampz(2011, 2, 7, 11, 5, 30, 0, "PST"), "'2011-02-07 11:05:30 PST'")
+	assertClauseDebugSerialize(t, Timestampz(2011, 3, 6, 11, 5, 30, 3, "+4:00"), "'2011-03-06 11:05:30.000000003 +4:00'")
+	assertClauseDebugSerialize(t, Timestampz(2011, 4, 5, 11, 5, 30, 30, "-8:00"), "'2011-04-05 11:05:30.00000003 -8:00'")
+	assertClauseDebugSerialize(t, Timestampz(2011, 5, 4, 11, 5, 30, 300, "400"), "'2011-05-04 11:05:30.0000003 400'")
+	assertClauseDebugSerialize(t, Timestampz(2011, 6, 3, 11, 5, 30, 3000, "zulu"), "'2011-06-03 11:05:30.000003 zulu'")
+}
+
+func TestDate(t *testing.T) {
+	assertClauseDebugSerialize(t, Date(2019, 8, 8), `'2019-08-08'`)
+}
diff --git a/internal/jet/serializer_test.go b/internal/jet/serializer_test.go
index 0d55807..ad84b96 100644
--- a/internal/jet/serializer_test.go
+++ b/internal/jet/serializer_test.go
@@ -24,6 +24,7 @@ func TestArgToString(t *testing.T) {
 	assert.Equal(t, argToString(float64(1.11)), "1.11")
 
 	assert.Equal(t, argToString("john"), "'john'")
+	assert.Equal(t, argToString("It's text"), "'It''s text'")
 	assert.Equal(t, argToString([]byte("john")), "'john'")
 	assert.Equal(t, argToString(uuid.MustParse("b68dbff4-a87d-11e9-a7f2-98ded00c39c6")), "'b68dbff4-a87d-11e9-a7f2-98ded00c39c6'")
 
diff --git a/internal/jet/testutils.go b/internal/jet/testutils.go
index 9680e95..ebcf5ce 100644
--- a/internal/jet/testutils.go
+++ b/internal/jet/testutils.go
@@ -67,6 +67,18 @@ func assertClauseSerializeErr(t *testing.T, clause Serializer, errString string)
 	assert.Error(t, err, errString)
 }
 
+func assertClauseDebugSerialize(t *testing.T, clause Serializer, query string, args ...interface{}) {
+	out := SqlBuilder{Dialect: DefaultDialect, debug: true}
+	err := clause.serialize(SelectStatementType, &out)
+
+	assert.NilError(t, err)
+
+	//fmt.Println(out.Buff.String())
+
+	assert.DeepEqual(t, out.Buff.String(), query)
+	assert.DeepEqual(t, out.Args, args)
+}
+
 func assertProjectionSerialize(t *testing.T, projection Projection, query string, args ...interface{}) {
 	out := SqlBuilder{Dialect: DefaultDialect}
 	err := projection.serializeForProjection(SelectStatementType, &out)
diff --git a/internal/jet/time_expression_test.go b/internal/jet/time_expression_test.go
index 8f595a2..2b3d015 100644
--- a/internal/jet/time_expression_test.go
+++ b/internal/jet/time_expression_test.go
@@ -2,52 +2,53 @@ package jet
 
 import (
 	"testing"
+	"time"
 )
 
 var timeVar = Time(10, 20, 0, 0)
 
 func TestTimeExpressionEQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTime.EQ(table2ColTime), "(table1.col_time = table2.col_time)")
-	assertClauseSerialize(t, table1ColTime.EQ(timeVar), "(table1.col_time = $1)", "10:20:00.000")
+	assertClauseSerialize(t, table1ColTime.EQ(timeVar), "(table1.col_time = $1)", "10:20:00")
 }
 
 func TestTimeExpressionNOT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTime.NOT_EQ(table2ColTime), "(table1.col_time != table2.col_time)")
-	assertClauseSerialize(t, table1ColTime.NOT_EQ(timeVar), "(table1.col_time != $1)", "10:20:00.000")
+	assertClauseSerialize(t, table1ColTime.NOT_EQ(timeVar), "(table1.col_time != $1)", "10:20:00")
 }
 
 func TestTimeExpressionIS_DISTINCT_FROM(t *testing.T) {
 	assertClauseSerialize(t, table1ColTime.IS_DISTINCT_FROM(table2ColTime), "(table1.col_time IS DISTINCT FROM table2.col_time)")
-	assertClauseSerialize(t, table1ColTime.IS_DISTINCT_FROM(timeVar), "(table1.col_time IS DISTINCT FROM $1)", "10:20:00.000")
+	assertClauseSerialize(t, table1ColTime.IS_DISTINCT_FROM(timeVar), "(table1.col_time IS DISTINCT FROM $1)", "10:20:00")
 }
 
 func TestTimeExpressionIS_NOT_DISTINCT_FROM(t *testing.T) {
 	assertClauseSerialize(t, table1ColTime.IS_NOT_DISTINCT_FROM(table2ColTime), "(table1.col_time IS NOT DISTINCT FROM table2.col_time)")
-	assertClauseSerialize(t, table1ColTime.IS_NOT_DISTINCT_FROM(timeVar), "(table1.col_time IS NOT DISTINCT FROM $1)", "10:20:00.000")
+	assertClauseSerialize(t, table1ColTime.IS_NOT_DISTINCT_FROM(timeVar), "(table1.col_time IS NOT DISTINCT FROM $1)", "10:20:00")
 }
 
 func TestTimeExpressionLT(t *testing.T) {
 	assertClauseSerialize(t, table1ColTime.LT(table2ColTime), "(table1.col_time < table2.col_time)")
-	assertClauseSerialize(t, table1ColTime.LT(timeVar), "(table1.col_time < $1)", "10:20:00.000")
+	assertClauseSerialize(t, table1ColTime.LT(timeVar), "(table1.col_time < $1)", "10:20:00")
 }
 
 func TestTimeExpressionLT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTime.LT_EQ(table2ColTime), "(table1.col_time <= table2.col_time)")
-	assertClauseSerialize(t, table1ColTime.LT_EQ(timeVar), "(table1.col_time <= $1)", "10:20:00.000")
+	assertClauseSerialize(t, table1ColTime.LT_EQ(timeVar), "(table1.col_time <= $1)", "10:20:00")
 }
 
 func TestTimeExpressionGT(t *testing.T) {
 	assertClauseSerialize(t, table1ColTime.GT(table2ColTime), "(table1.col_time > table2.col_time)")
-	assertClauseSerialize(t, table1ColTime.GT(timeVar), "(table1.col_time > $1)", "10:20:00.000")
+	assertClauseSerialize(t, table1ColTime.GT(timeVar), "(table1.col_time > $1)", "10:20:00")
 }
 
 func TestTimeExpressionGT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTime.GT_EQ(table2ColTime), "(table1.col_time >= table2.col_time)")
-	assertClauseSerialize(t, table1ColTime.GT_EQ(timeVar), "(table1.col_time >= $1)", "10:20:00.000")
+	assertClauseSerialize(t, table1ColTime.GT_EQ(timeVar), "(table1.col_time >= $1)", "10:20:00")
 }
 
 func TestTimeExp(t *testing.T) {
 	assertClauseSerialize(t, TimeExp(table1ColFloat), "table1.col_float")
-	assertClauseSerialize(t, TimeExp(table1ColFloat).LT(Time(1, 1, 1, 1)),
+	assertClauseSerialize(t, TimeExp(table1ColFloat).LT(Time(1, 1, 1, 1*time.Millisecond)),
 		"(table1.col_float < $1)", string("01:01:01.001"))
 }
diff --git a/internal/jet/timestamp_expression_test.go b/internal/jet/timestamp_expression_test.go
index b49fc9f..9a9ceb4 100644
--- a/internal/jet/timestamp_expression_test.go
+++ b/internal/jet/timestamp_expression_test.go
@@ -1,52 +1,55 @@
 package jet
 
-import "testing"
+import (
+	"testing"
+	"time"
+)
 
-var timestamp = Timestamp(2000, 1, 31, 10, 20, 0, 0)
+var timestamp = Timestamp(2000, 1, 31, 10, 20, 0, 3*time.Millisecond)
 
 func TestTimestampExpressionEQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestamp.EQ(table2ColTimestamp), "(table1.col_timestamp = table2.col_timestamp)")
 	assertClauseSerialize(t, table1ColTimestamp.EQ(timestamp),
-		"(table1.col_timestamp = $1)", "2000-01-31 10:20:00.000")
+		"(table1.col_timestamp = $1)", "2000-01-31 10:20:00.003")
 }
 
 func TestTimestampExpressionNOT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestamp.NOT_EQ(table2ColTimestamp), "(table1.col_timestamp != table2.col_timestamp)")
-	assertClauseSerialize(t, table1ColTimestamp.NOT_EQ(timestamp), "(table1.col_timestamp != $1)", "2000-01-31 10:20:00.000")
+	assertClauseSerialize(t, table1ColTimestamp.NOT_EQ(timestamp), "(table1.col_timestamp != $1)", "2000-01-31 10:20:00.003")
 }
 
 func TestTimestampExpressionIS_DISTINCT_FROM(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestamp.IS_DISTINCT_FROM(table2ColTimestamp), "(table1.col_timestamp IS DISTINCT FROM table2.col_timestamp)")
-	assertClauseSerialize(t, table1ColTimestamp.IS_DISTINCT_FROM(timestamp), "(table1.col_timestamp IS DISTINCT FROM $1)", "2000-01-31 10:20:00.000")
+	assertClauseSerialize(t, table1ColTimestamp.IS_DISTINCT_FROM(timestamp), "(table1.col_timestamp IS DISTINCT FROM $1)", "2000-01-31 10:20:00.003")
 }
 
 func TestTimestampExpressionIS_NOT_DISTINCT_FROM(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestamp.IS_NOT_DISTINCT_FROM(table2ColTimestamp), "(table1.col_timestamp IS NOT DISTINCT FROM table2.col_timestamp)")
-	assertClauseSerialize(t, table1ColTimestamp.IS_NOT_DISTINCT_FROM(timestamp), "(table1.col_timestamp IS NOT DISTINCT FROM $1)", "2000-01-31 10:20:00.000")
+	assertClauseSerialize(t, table1ColTimestamp.IS_NOT_DISTINCT_FROM(timestamp), "(table1.col_timestamp IS NOT DISTINCT FROM $1)", "2000-01-31 10:20:00.003")
 }
 
 func TestTimestampExpressionLT(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestamp.LT(table2ColTimestamp), "(table1.col_timestamp < table2.col_timestamp)")
-	assertClauseSerialize(t, table1ColTimestamp.LT(timestamp), "(table1.col_timestamp < $1)", "2000-01-31 10:20:00.000")
+	assertClauseSerialize(t, table1ColTimestamp.LT(timestamp), "(table1.col_timestamp < $1)", "2000-01-31 10:20:00.003")
 }
 
 func TestTimestampExpressionLT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestamp.LT_EQ(table2ColTimestamp), "(table1.col_timestamp <= table2.col_timestamp)")
-	assertClauseSerialize(t, table1ColTimestamp.LT_EQ(timestamp), "(table1.col_timestamp <= $1)", "2000-01-31 10:20:00.000")
+	assertClauseSerialize(t, table1ColTimestamp.LT_EQ(timestamp), "(table1.col_timestamp <= $1)", "2000-01-31 10:20:00.003")
 }
 
 func TestTimestampExpressionGT(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestamp.GT(table2ColTimestamp), "(table1.col_timestamp > table2.col_timestamp)")
-	assertClauseSerialize(t, table1ColTimestamp.GT(timestamp), "(table1.col_timestamp > $1)", "2000-01-31 10:20:00.000")
+	assertClauseSerialize(t, table1ColTimestamp.GT(timestamp), "(table1.col_timestamp > $1)", "2000-01-31 10:20:00.003")
 }
 
 func TestTimestampExpressionGT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestamp.GT_EQ(table2ColTimestamp), "(table1.col_timestamp >= table2.col_timestamp)")
-	assertClauseSerialize(t, table1ColTimestamp.GT_EQ(timestamp), "(table1.col_timestamp >= $1)", "2000-01-31 10:20:00.000")
+	assertClauseSerialize(t, table1ColTimestamp.GT_EQ(timestamp), "(table1.col_timestamp >= $1)", "2000-01-31 10:20:00.003")
 }
 
 func TestTimestampExp(t *testing.T) {
 	assertClauseSerialize(t, TimestampExp(table1ColFloat), "table1.col_float")
 	assertClauseSerialize(t, TimestampExp(table1ColFloat).LT(timestamp),
-		"(table1.col_float < $1)", "2000-01-31 10:20:00.000")
+		"(table1.col_float < $1)", "2000-01-31 10:20:00.003")
 }
diff --git a/internal/jet/timestampz_expression_test.go b/internal/jet/timestampz_expression_test.go
index 8ec30d3..6880c93 100644
--- a/internal/jet/timestampz_expression_test.go
+++ b/internal/jet/timestampz_expression_test.go
@@ -1,52 +1,55 @@
 package jet
 
-import "testing"
+import (
+	"testing"
+	"time"
+)
 
-var timestampz = Timestampz(2000, 1, 31, 10, 20, 0, 0, 2)
+var timestampz = Timestampz(2000, 1, 31, 10, 20, 5, 23*time.Microsecond, "+200")
 
 func TestTimestampzExpressionEQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestampz.EQ(table2ColTimestampz), "(table1.col_timestampz = table2.col_timestampz)")
 	assertClauseSerialize(t, table1ColTimestampz.EQ(timestampz),
-		"(table1.col_timestampz = $1)", "2000-01-31 10:20:00.000 +002")
+		"(table1.col_timestampz = $1)", "2000-01-31 10:20:05.000023 +200")
 }
 
 func TestTimestampzExpressionNOT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestampz.NOT_EQ(table2ColTimestampz), "(table1.col_timestampz != table2.col_timestampz)")
-	assertClauseSerialize(t, table1ColTimestampz.NOT_EQ(timestampz), "(table1.col_timestampz != $1)", "2000-01-31 10:20:00.000 +002")
+	assertClauseSerialize(t, table1ColTimestampz.NOT_EQ(timestampz), "(table1.col_timestampz != $1)", "2000-01-31 10:20:05.000023 +200")
 }
 
 func TestTimestampzExpressionIS_DISTINCT_FROM(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestampz.IS_DISTINCT_FROM(table2ColTimestampz), "(table1.col_timestampz IS DISTINCT FROM table2.col_timestampz)")
-	assertClauseSerialize(t, table1ColTimestampz.IS_DISTINCT_FROM(timestampz), "(table1.col_timestampz IS DISTINCT FROM $1)", "2000-01-31 10:20:00.000 +002")
+	assertClauseSerialize(t, table1ColTimestampz.IS_DISTINCT_FROM(timestampz), "(table1.col_timestampz IS DISTINCT FROM $1)", "2000-01-31 10:20:05.000023 +200")
 }
 
 func TestTimestampzExpressionIS_NOT_DISTINCT_FROM(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestampz.IS_NOT_DISTINCT_FROM(table2ColTimestampz), "(table1.col_timestampz IS NOT DISTINCT FROM table2.col_timestampz)")
-	assertClauseSerialize(t, table1ColTimestampz.IS_NOT_DISTINCT_FROM(timestampz), "(table1.col_timestampz IS NOT DISTINCT FROM $1)", "2000-01-31 10:20:00.000 +002")
+	assertClauseSerialize(t, table1ColTimestampz.IS_NOT_DISTINCT_FROM(timestampz), "(table1.col_timestampz IS NOT DISTINCT FROM $1)", "2000-01-31 10:20:05.000023 +200")
 }
 
 func TestTimestampzExpressionLT(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestampz.LT(table2ColTimestampz), "(table1.col_timestampz < table2.col_timestampz)")
-	assertClauseSerialize(t, table1ColTimestampz.LT(timestampz), "(table1.col_timestampz < $1)", "2000-01-31 10:20:00.000 +002")
+	assertClauseSerialize(t, table1ColTimestampz.LT(timestampz), "(table1.col_timestampz < $1)", "2000-01-31 10:20:05.000023 +200")
 }
 
 func TestTimestampzExpressionLT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestampz.LT_EQ(table2ColTimestampz), "(table1.col_timestampz <= table2.col_timestampz)")
-	assertClauseSerialize(t, table1ColTimestampz.LT_EQ(timestampz), "(table1.col_timestampz <= $1)", "2000-01-31 10:20:00.000 +002")
+	assertClauseSerialize(t, table1ColTimestampz.LT_EQ(timestampz), "(table1.col_timestampz <= $1)", "2000-01-31 10:20:05.000023 +200")
 }
 
 func TestTimestampzExpressionGT(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestampz.GT(table2ColTimestampz), "(table1.col_timestampz > table2.col_timestampz)")
-	assertClauseSerialize(t, table1ColTimestampz.GT(timestampz), "(table1.col_timestampz > $1)", "2000-01-31 10:20:00.000 +002")
+	assertClauseSerialize(t, table1ColTimestampz.GT(timestampz), "(table1.col_timestampz > $1)", "2000-01-31 10:20:05.000023 +200")
 }
 
 func TestTimestampzExpressionGT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimestampz.GT_EQ(table2ColTimestampz), "(table1.col_timestampz >= table2.col_timestampz)")
-	assertClauseSerialize(t, table1ColTimestampz.GT_EQ(timestampz), "(table1.col_timestampz >= $1)", "2000-01-31 10:20:00.000 +002")
+	assertClauseSerialize(t, table1ColTimestampz.GT_EQ(timestampz), "(table1.col_timestampz >= $1)", "2000-01-31 10:20:05.000023 +200")
 }
 
 func TestTimestampzExp(t *testing.T) {
 	assertClauseSerialize(t, TimestampzExp(table1ColFloat), "table1.col_float")
 	assertClauseSerialize(t, TimestampzExp(table1ColFloat).LT(timestampz),
-		"(table1.col_float < $1)", "2000-01-31 10:20:00.000 +002")
+		"(table1.col_float < $1)", "2000-01-31 10:20:05.000023 +200")
 }
diff --git a/internal/jet/timez_expression_test.go b/internal/jet/timez_expression_test.go
index 23aef52..2a0312a 100644
--- a/internal/jet/timez_expression_test.go
+++ b/internal/jet/timez_expression_test.go
@@ -2,50 +2,50 @@ package jet
 
 import "testing"
 
-var timezVar = Timez(10, 20, 0, 0, 4)
+var timezVar = Timez(10, 20, 0, 0, "+4:00")
 
 func TestTimezExpressionEQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimez.EQ(table2ColTimez), "(table1.col_timez = table2.col_timez)")
-	assertClauseSerialize(t, table1ColTimez.EQ(timezVar), "(table1.col_timez = $1)", "10:20:00.000 +04")
+	assertClauseSerialize(t, table1ColTimez.EQ(timezVar), "(table1.col_timez = $1)", "10:20:00 +4:00")
 }
 
 func TestTimezExpressionNOT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimez.NOT_EQ(table2ColTimez), "(table1.col_timez != table2.col_timez)")
-	assertClauseSerialize(t, table1ColTimez.NOT_EQ(timezVar), "(table1.col_timez != $1)", "10:20:00.000 +04")
+	assertClauseSerialize(t, table1ColTimez.NOT_EQ(timezVar), "(table1.col_timez != $1)", "10:20:00 +4:00")
 }
 
 func TestTimezExpressionIS_DISTINCT_FROM(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimez.IS_DISTINCT_FROM(table2ColTimez), "(table1.col_timez IS DISTINCT FROM table2.col_timez)")
-	assertClauseSerialize(t, table1ColTimez.IS_DISTINCT_FROM(timezVar), "(table1.col_timez IS DISTINCT FROM $1)", "10:20:00.000 +04")
+	assertClauseSerialize(t, table1ColTimez.IS_DISTINCT_FROM(timezVar), "(table1.col_timez IS DISTINCT FROM $1)", "10:20:00 +4:00")
 }
 
 func TestTimezExpressionIS_NOT_DISTINCT_FROM(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimez.IS_NOT_DISTINCT_FROM(table2ColTimez), "(table1.col_timez IS NOT DISTINCT FROM table2.col_timez)")
-	assertClauseSerialize(t, table1ColTimez.IS_NOT_DISTINCT_FROM(timezVar), "(table1.col_timez IS NOT DISTINCT FROM $1)", "10:20:00.000 +04")
+	assertClauseSerialize(t, table1ColTimez.IS_NOT_DISTINCT_FROM(timezVar), "(table1.col_timez IS NOT DISTINCT FROM $1)", "10:20:00 +4:00")
 }
 
 func TestTimezExpressionLT(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimez.LT(table2ColTimez), "(table1.col_timez < table2.col_timez)")
-	assertClauseSerialize(t, table1ColTimez.LT(timezVar), "(table1.col_timez < $1)", "10:20:00.000 +04")
+	assertClauseSerialize(t, table1ColTimez.LT(timezVar), "(table1.col_timez < $1)", "10:20:00 +4:00")
 }
 
 func TestTimezExpressionLT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimez.LT_EQ(table2ColTimez), "(table1.col_timez <= table2.col_timez)")
-	assertClauseSerialize(t, table1ColTimez.LT_EQ(timezVar), "(table1.col_timez <= $1)", "10:20:00.000 +04")
+	assertClauseSerialize(t, table1ColTimez.LT_EQ(timezVar), "(table1.col_timez <= $1)", "10:20:00 +4:00")
 }
 
 func TestTimezExpressionGT(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimez.GT(table2ColTimez), "(table1.col_timez > table2.col_timez)")
-	assertClauseSerialize(t, table1ColTimez.GT(timezVar), "(table1.col_timez > $1)", "10:20:00.000 +04")
+	assertClauseSerialize(t, table1ColTimez.GT(timezVar), "(table1.col_timez > $1)", "10:20:00 +4:00")
 }
 
 func TestTimezExpressionGT_EQ(t *testing.T) {
 	assertClauseSerialize(t, table1ColTimez.GT_EQ(table2ColTimez), "(table1.col_timez >= table2.col_timez)")
-	assertClauseSerialize(t, table1ColTimez.GT_EQ(timezVar), "(table1.col_timez >= $1)", "10:20:00.000 +04")
+	assertClauseSerialize(t, table1ColTimez.GT_EQ(timezVar), "(table1.col_timez >= $1)", "10:20:00 +4:00")
 }
 
 func TestTimezExp(t *testing.T) {
 	assertClauseSerialize(t, TimezExp(table1ColFloat), "table1.col_float")
-	assertClauseSerialize(t, TimezExp(table1ColFloat).LT(Timez(1, 1, 1, 1, 4)),
-		"(table1.col_float < $1)", string("01:01:01.001 +04"))
+	assertClauseSerialize(t, TimezExp(table1ColFloat).LT(Timez(1, 1, 1, 1, "+4:00")),
+		"(table1.col_float < $1)", string("01:01:01.000000001 +4:00"))
 }
diff --git a/internal/testutils/test_utils.go b/internal/testutils/test_utils.go
index fcf7655..59ee748 100644
--- a/internal/testutils/test_utils.go
+++ b/internal/testutils/test_utils.go
@@ -119,7 +119,11 @@ func AssertClauseSerialize(t *testing.T, dialect jet.Dialect, clause jet.Seriali
 	//fmt.Println(out.Buff.String())
 
 	assert.DeepEqual(t, out.Buff.String(), query)
-	assert.DeepEqual(t, out.Args, args)
+
+	if len(args) > 0 {
+		assert.DeepEqual(t, out.Args, args)
+	}
+
 }
 
 func AssertClauseSerializeErr(t *testing.T, dialect jet.Dialect, clause jet.Serializer, errString string) {
diff --git a/mysql/cast.go b/mysql/cast.go
index c53005e..c4c056c 100644
--- a/mysql/cast.go
+++ b/mysql/cast.go
@@ -2,14 +2,27 @@ package mysql
 
 import (
 	"github.com/go-jet/jet/internal/jet"
+	"strconv"
 )
 
 type cast interface {
-	jet.Cast
-
+	// Cast expressions as castType type
+	AS(castType string) Expression
+	// Cast expression as char with optional length
+	AS_CHAR(lenght ...int) StringExpression
+	// Cast expression AS date type
+	AS_DATE() DateExpression
+	// Cast expression AS numeric type, using precision and optionally scale
+	AS_DECIMAL() FloatExpression
+	// Cast expression AS time type
+	AS_TIME() TimeExpression
+	// Cast expression as datetime type
 	AS_DATETIME() DateTimeExpression
+	// Cast expressions as signed integer type
 	AS_SIGNED() IntegerExpression
+	// Cast expression as unsigned integer type
 	AS_UNSIGNED() IntegerExpression
+	// Cast expression as binary type
 	AS_BINARY() StringExpression
 }
 
@@ -25,6 +38,10 @@ func CAST(expr jet.Expression) cast {
 	return castImpl
 }
 
+func (c *castImpl) AS(castType string) Expression {
+	return c.Cast.AS(castType)
+}
+
 func (c *castImpl) AS_DATETIME() DateTimeExpression {
 	return DateTimeExp(c.AS("DATETIME"))
 }
@@ -37,6 +54,29 @@ func (c *castImpl) AS_UNSIGNED() IntegerExpression {
 	return IntExp(c.AS("UNSIGNED"))
 }
 
+func (b *castImpl) AS_CHAR(lenght ...int) StringExpression {
+	if len(lenght) > 0 {
+		return StringExp(b.AS("CHAR(" + strconv.Itoa(lenght[0]) + ")"))
+	}
+
+	return StringExp(b.AS("CHAR"))
+}
+
+// Cast expression AS date type
+func (b *castImpl) AS_DATE() DateExpression {
+	return DateExp(b.AS("DATE"))
+}
+
+// Cast expression AS date type
+func (b *castImpl) AS_DECIMAL() FloatExpression {
+	return FloatExp(b.AS("DECIMAL"))
+}
+
+// Cast expression AS date type
+func (b *castImpl) AS_TIME() TimeExpression {
+	return TimeExp(b.AS("TIME"))
+}
+
 func (c *castImpl) AS_BINARY() StringExpression {
 	return StringExp(c.AS("BINARY"))
 }
diff --git a/mysql/cast_test.go b/mysql/cast_test.go
index 26b6426..cc1a809 100644
--- a/mysql/cast_test.go
+++ b/mysql/cast_test.go
@@ -4,6 +4,15 @@ import (
 	"testing"
 )
 
-func TestCAST_AS_DATE(t *testing.T) {
-	assertClauseSerialize(t, CAST(Int(22)).AS_DATE(), `CAST(? AS DATE)`, int64(22))
+func TestCAST(t *testing.T) {
+	assertClauseSerialize(t, CAST(Float(11.22)).AS("bigint"), `CAST(? AS bigint)`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_CHAR(), `CAST(? AS CHAR)`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_CHAR(10), `CAST(? AS CHAR(10))`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_DATE(), `CAST(? AS DATE)`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_DECIMAL(), `CAST(? AS DECIMAL)`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_TIME(), `CAST(? AS TIME)`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_DATETIME(), `CAST(? AS DATETIME)`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_SIGNED(), `CAST(? AS SIGNED)`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_UNSIGNED(), `CAST(? AS UNSIGNED)`)
+	assertClauseSerialize(t, CAST(Int(22)).AS_BINARY(), `CAST(? AS BINARY)`)
 }
diff --git a/mysql/literal.go b/mysql/literal.go
index a2b98db..9cf7592 100644
--- a/mysql/literal.go
+++ b/mysql/literal.go
@@ -17,26 +17,23 @@ var String = jet.String
 var Date = func(year int, month time.Month, day int) DateExpression {
 	return CAST(jet.Date(year, month, day)).AS_DATE()
 }
-
 var DateT = func(t time.Time) DateExpression {
 	return CAST(jet.DateT(t)).AS_DATE()
 }
-var Time = func(hour, minute, second int, milliseconds ...int) TimeExpression {
-	return CAST(jet.Time(hour, minute, second, milliseconds...)).AS_TIME()
+var Time = func(hour, minute, second int, nanoseconds ...time.Duration) TimeExpression {
+	return CAST(jet.Time(hour, minute, second, nanoseconds...)).AS_TIME()
 }
-
 var TimeT = func(t time.Time) TimeExpression {
 	return CAST(jet.TimeT(t)).AS_TIME()
 }
-var DateTime = func(year int, month time.Month, day, hour, minute, second int, milliseconds ...int) DateTimeExpression {
-	return CAST(jet.Timestamp(year, month, day, hour, minute, second, milliseconds...)).AS_DATETIME()
+var DateTime = func(year int, month time.Month, day, hour, minute, second int, nanoseconds ...time.Duration) DateTimeExpression {
+	return CAST(jet.Timestamp(year, month, day, hour, minute, second, nanoseconds...)).AS_DATETIME()
 }
-
 var DateTimeT = func(t time.Time) DateTimeExpression {
 	return CAST(jet.TimestampT(t)).AS_DATETIME()
 }
-var Timestamp = func(year int, month time.Month, day, hour, minute, second int, milliseconds ...int) TimestampExpression {
-	return TIMESTAMP(StringExp(jet.Timestamp(year, month, day, hour, minute, second, milliseconds...)))
+var Timestamp = func(year int, month time.Month, day, hour, minute, second int, nanoseconds ...time.Duration) TimestampExpression {
+	return TIMESTAMP(StringExp(jet.Timestamp(year, month, day, hour, minute, second, nanoseconds...)))
 }
 var TimestampT = func(t time.Time) TimestampExpression {
 	return TIMESTAMP(StringExp(jet.TimestampT(t)))
diff --git a/mysql/literal_test.go b/mysql/literal_test.go
new file mode 100644
index 0000000..f677d11
--- /dev/null
+++ b/mysql/literal_test.go
@@ -0,0 +1,42 @@
+package mysql
+
+import (
+	"testing"
+	"time"
+)
+
+func TestBool(t *testing.T) {
+	assertClauseSerialize(t, Bool(false), `?`, false)
+}
+
+func TestInt(t *testing.T) {
+	assertClauseSerialize(t, Int(11), `?`, int64(11))
+}
+
+func TestFloat(t *testing.T) {
+	assertClauseSerialize(t, Float(12.34), `?`, float64(12.34))
+}
+
+func TestString(t *testing.T) {
+	assertClauseSerialize(t, String("Some text"), `?`, "Some text")
+}
+
+func TestDate(t *testing.T) {
+	assertClauseSerialize(t, Date(2014, time.January, 2), `CAST(? AS DATE)`, "2014-01-02")
+	assertClauseSerialize(t, DateT(time.Now()), `CAST(? AS DATE)`)
+}
+
+func TestTime(t *testing.T) {
+	assertClauseSerialize(t, Time(10, 15, 30), `CAST(? AS TIME)`, "10:15:30")
+	assertClauseSerialize(t, TimeT(time.Now()), `CAST(? AS TIME)`)
+}
+
+func TestDateTime(t *testing.T) {
+	assertClauseSerialize(t, DateTime(2010, time.March, 30, 10, 15, 30), `CAST(? AS DATETIME)`, "2010-03-30 10:15:30")
+	assertClauseSerialize(t, DateTimeT(time.Now()), `CAST(? AS DATETIME)`)
+}
+
+func TestTimestamp(t *testing.T) {
+	assertClauseSerialize(t, Timestamp(2010, time.March, 30, 10, 15, 30), `TIMESTAMP(?)`, "2010-03-30 10:15:30")
+	assertClauseSerialize(t, TimestampT(time.Now()), `TIMESTAMP(?)`)
+}
diff --git a/postgres/cast.go b/postgres/cast.go
index 747dd97..7c91cc1 100644
--- a/postgres/cast.go
+++ b/postgres/cast.go
@@ -3,13 +3,13 @@ package postgres
 import (
 	"fmt"
 	"github.com/go-jet/jet/internal/jet"
+	"strconv"
 )
 
 type cast interface {
-	jet.Cast
+	AS(castType string) Expression
 	// Cast expression AS bool type
 	AS_BOOL() BoolExpression
-
 	// Cast expression AS smallint type
 	AS_SMALLINT() IntegerExpression
 	// Cast expression AS integer type
@@ -18,16 +18,22 @@ type cast interface {
 	AS_BIGINT() IntegerExpression
 	// Cast expression AS numeric type, using precision and optionally scale
 	AS_NUMERIC(precisionAndScale ...int) FloatExpression
-
 	// Cast expression AS real type
 	AS_REAL() FloatExpression
 	// Cast expression AS double precision type
 	AS_DOUBLE() FloatExpression
+	// Cast expression AS char with optional length
+	AS_CHAR(length ...int) StringExpression
+	// Cast expression AS date type
+	AS_DATE() DateExpression
+	// Cast expression AS numeric type, using precision and optionally scale
+	AS_DECIMAL() FloatExpression
+	// Cast expression AS time type
+	AS_TIME() TimeExpression
 	// Cast expression AS text type
 	AS_TEXT() StringExpression
 
 	AS_BYTEA() StringExpression
-
 	// Cast expression AS time with time timezone type
 	AS_TIMEZ() TimezExpression
 	// Cast expression AS timestamp type
@@ -48,22 +54,26 @@ func CAST(expr Expression) cast {
 	return castImpl
 }
 
+func (b *castImpl) AS(castType string) Expression {
+	return b.Cast.AS(castType)
+}
+
 func (b *castImpl) AS_BOOL() BoolExpression {
-	return jet.BoolExp(b.AS("boolean"))
+	return BoolExp(b.AS("boolean"))
 }
 
 func (b *castImpl) AS_SMALLINT() IntegerExpression {
-	return jet.IntExp(b.AS("smallint"))
+	return IntExp(b.AS("smallint"))
 }
 
 // Cast expression AS integer type
 func (b *castImpl) AS_INTEGER() IntegerExpression {
-	return jet.IntExp(b.AS("integer"))
+	return IntExp(b.AS("integer"))
 }
 
 // Cast expression AS bigint type
 func (b *castImpl) AS_BIGINT() IntegerExpression {
-	return jet.IntExp(b.AS("bigint"))
+	return IntExp(b.AS("bigint"))
 }
 
 // Cast expression AS numeric type, using precision and optionally scale
@@ -77,45 +87,63 @@ func (b *castImpl) AS_NUMERIC(precisionAndScale ...int) FloatExpression {
 		castArgs = fmt.Sprintf("(%d)", precisionAndScale[0])
 	}
 
-	return jet.FloatExp(b.AS("numeric" + castArgs))
+	return FloatExp(b.AS("numeric" + castArgs))
 }
 
 // Cast expression AS real type
 func (b *castImpl) AS_REAL() FloatExpression {
-	return jet.FloatExp(b.AS("real"))
+	return FloatExp(b.AS("real"))
 }
 
 // Cast expression AS double precision type
 func (b *castImpl) AS_DOUBLE() FloatExpression {
-	return jet.FloatExp(b.AS("double precision"))
+	return FloatExp(b.AS("double precision"))
 }
 
 // Cast expression AS text type
 func (b *castImpl) AS_TEXT() StringExpression {
-	return jet.StringExp(b.AS("text"))
+	return StringExp(b.AS("text"))
+}
+
+func (b *castImpl) AS_CHAR(lenght ...int) StringExpression {
+	if len(lenght) > 0 {
+		return StringExp(b.AS("char(" + strconv.Itoa(lenght[0]) + ")"))
+	}
+
+	return StringExp(b.AS("char"))
+}
+
+// Cast expression AS date type
+func (b *castImpl) AS_DATE() DateExpression {
+	return DateExp(b.AS("date"))
+}
+
+// Cast expression AS date type
+func (b *castImpl) AS_DECIMAL() FloatExpression {
+	return FloatExp(b.AS("decimal"))
 }
 
 // Cast expression AS text type
 func (b *castImpl) AS_BYTEA() StringExpression {
-	return jet.StringExp(b.AS("bytea"))
+	return StringExp(b.AS("bytea"))
 }
 
 // Cast expression AS date type
-func (b *castImpl) AS_TIME() jet.TimeExpression {
+func (b *castImpl) AS_TIME() TimeExpression {
 	return TimeExp(b.AS("time without time zone"))
 }
 
 // Cast expression AS time with time timezone type
 func (b *castImpl) AS_TIMEZ() TimezExpression {
-	return jet.TimezExp(b.AS("time with time zone"))
+	return TimezExp(b.AS("time with time zone"))
 }
 
 // Cast expression AS timestamp type
 func (b *castImpl) AS_TIMESTAMP() TimestampExpression {
-	return jet.TimestampExp(b.AS("timestamp without time zone"))
+	return TimestampExp(b.AS("timestamp without time zone"))
 }
 
 // Cast expression AS timestamp with timezone type
 func (b *castImpl) AS_TIMESTAMPZ() TimestampzExpression {
-	return jet.TimestampzExp(b.AS("timestamp with time zone"))
+	return TimestampzExp(b.AS("timestamp with time zone"))
 }
diff --git a/postgres/cast_test.go b/postgres/cast_test.go
index 297e327..4537784 100644
--- a/postgres/cast_test.go
+++ b/postgres/cast_test.go
@@ -44,7 +44,7 @@ func TestExpressionCAST_AS_TEXT(t *testing.T) {
 }
 
 func TestExpressionCAST_AS_DATE(t *testing.T) {
-	assertClauseSerialize(t, CAST(table2Col3).AS_DATE(), "table2.col3::DATE")
+	assertClauseSerialize(t, CAST(table2Col3).AS_DATE(), "table2.col3::date")
 }
 
 func TestExpressionCAST_AS_TIME(t *testing.T) {
diff --git a/postgres/expressions.go b/postgres/expressions.go
index df6916e..0333a0d 100644
--- a/postgres/expressions.go
+++ b/postgres/expressions.go
@@ -26,6 +26,7 @@ var BoolExp = jet.BoolExp
 var IntExp = jet.IntExp
 var FloatExp = jet.FloatExp
 var TimeExp = jet.TimeExp
+var StringExp = jet.StringExp
 var TimezExp = jet.TimezExp
 var DateExp = jet.DateExp
 var TimestampExp = jet.TimestampExp
diff --git a/postgres/literal.go b/postgres/literal.go
index b64c24c..4defa62 100644
--- a/postgres/literal.go
+++ b/postgres/literal.go
@@ -13,43 +13,33 @@ var String = jet.String
 var Bytea = func(value string) StringExpression {
 	return CAST(jet.String(value)).AS_BYTEA()
 }
-
 var Date = func(year int, month time.Month, day int) DateExpression {
 	return CAST(jet.Date(year, month, day)).AS_DATE()
 }
-
 var DateT = func(t time.Time) DateExpression {
 	return CAST(jet.DateT(t)).AS_DATE()
 }
-
-var Time = func(hour, minute, second int, milliseconds ...int) TimeExpression {
-	return CAST(jet.Time(hour, minute, second, milliseconds...)).AS_TIME()
+var Time = func(hour, minute, second int, nanoseconds ...time.Duration) TimeExpression {
+	return CAST(jet.Time(hour, minute, second, nanoseconds...)).AS_TIME()
 }
-
 var TimeT = func(t time.Time) TimeExpression {
 	return CAST(jet.TimeT(t)).AS_TIME()
 }
-
-var Timez = func(hour, minute, second, milliseconds int, timezone int) TimezExpression {
+var Timez = func(hour, minute, second int, milliseconds time.Duration, timezone string) TimezExpression {
 	return CAST(jet.Timez(hour, minute, second, milliseconds, timezone)).AS_TIMEZ()
 }
-
 var TimezT = func(t time.Time) TimezExpression {
 	return CAST(jet.TimezT(t)).AS_TIMEZ()
 }
-
-var Timestamp = func(year int, month time.Month, day, hour, minute, second, milliseconds int) TimestampExpression {
-	return CAST(jet.Timestamp(year, month, day, hour, minute, second, milliseconds)).AS_TIMESTAMP()
+var Timestamp = func(year int, month time.Month, day, hour, minute, second int, milliseconds ...time.Duration) TimestampExpression {
+	return CAST(jet.Timestamp(year, month, day, hour, minute, second, milliseconds...)).AS_TIMESTAMP()
 }
-
 var TimestampT = func(t time.Time) TimestampExpression {
 	return CAST(jet.TimestampzT(t)).AS_TIMESTAMP()
 }
-
-var Timestampz = func(year, month, day, hour, minute, second, milliseconds int, timezone int) TimestampzExpression {
+var Timestampz = func(year int, month time.Month, day, hour, minute, second int, milliseconds time.Duration, timezone string) TimestampzExpression {
 	return CAST(jet.Timestampz(year, month, day, hour, minute, second, milliseconds, timezone)).AS_TIMESTAMPZ()
 }
-
 var TimestampzT = func(t time.Time) TimestampzExpression {
 	return CAST(jet.TimestampzT(t)).AS_TIMESTAMPZ()
 }
diff --git a/postgres/literal_test.go b/postgres/literal_test.go
index 89f7601..f30ef01 100644
--- a/postgres/literal_test.go
+++ b/postgres/literal_test.go
@@ -1,7 +1,50 @@
 package postgres
 
-import "testing"
+import (
+	"testing"
+	"time"
+)
 
-func TestDateLiteral(t *testing.T) {
-	assertClauseSerialize(t, Date(2019, 8, 6), "$1::DATE", "2019-08-06")
+func TestBool(t *testing.T) {
+	assertClauseSerialize(t, Bool(false), `$1`, false)
+}
+
+func TestInt(t *testing.T) {
+	assertClauseSerialize(t, Int(11), `$1`, int64(11))
+}
+
+func TestFloat(t *testing.T) {
+	assertClauseSerialize(t, Float(12.34), `$1`, float64(12.34))
+}
+
+func TestString(t *testing.T) {
+	assertClauseSerialize(t, String("Some text"), `$1`, "Some text")
+}
+
+func TestDate(t *testing.T) {
+	assertClauseSerialize(t, Date(2014, time.January, 2), `$1::date`, "2014-01-02")
+	assertClauseSerialize(t, DateT(time.Now()), `$1::date`)
+}
+
+func TestTime(t *testing.T) {
+	assertClauseSerialize(t, Time(10, 15, 30), `$1::time without time zone`, "10:15:30")
+	assertClauseSerialize(t, TimeT(time.Now()), `$1::time without time zone`)
+}
+
+func TestTimez(t *testing.T) {
+	assertClauseSerialize(t, Timez(10, 15, 30, 0, "UTC"),
+		`$1::time with time zone`, "10:15:30 UTC")
+	assertClauseSerialize(t, TimezT(time.Now()), `$1::time with time zone`)
+}
+
+func TestTimestamp(t *testing.T) {
+	assertClauseSerialize(t, Timestamp(2010, time.March, 30, 10, 15, 30),
+		`$1::timestamp without time zone`, "2010-03-30 10:15:30")
+	assertClauseSerialize(t, TimestampT(time.Now()), `$1::timestamp without time zone`)
+}
+
+func TestTimestampz(t *testing.T) {
+	assertClauseSerialize(t, Timestampz(2010, time.March, 30, 10, 15, 30, 0, "UTC"),
+		`$1::timestamp with time zone`, "2010-03-30 10:15:30 UTC")
+	assertClauseSerialize(t, TimestampzT(time.Now()), `$1::timestamp with time zone`)
 }
diff --git a/tests/mysql/alltypes_test.go b/tests/mysql/alltypes_test.go
index c305c26..6e15330 100644
--- a/tests/mysql/alltypes_test.go
+++ b/tests/mysql/alltypes_test.go
@@ -1,6 +1,7 @@
 package mysql
 
 import (
+	"fmt"
 	"github.com/go-jet/jet/internal/testutils"
 	"github.com/go-jet/jet/tests/.gentestdata/mysql/test_sample/model"
 	. "github.com/go-jet/jet/tests/.gentestdata/mysql/test_sample/table"
@@ -494,8 +495,8 @@ func TestTimeExpressions(t *testing.T) {
 
 		AllTypes.Time.EQ(AllTypes.Time),
 		AllTypes.Time.EQ(Time(23, 6, 6)),
-		AllTypes.Time.EQ(Time(22, 6, 6, 11)),
-		AllTypes.Time.EQ(Time(21, 6, 6, 11111)),
+		AllTypes.Time.EQ(Time(22, 6, 6, 11*time.Millisecond)),
+		AllTypes.Time.EQ(Time(21, 6, 6, 11111*time.Microsecond)),
 
 		AllTypes.TimePtr.NOT_EQ(AllTypes.Time),
 		AllTypes.TimePtr.NOT_EQ(Time(20, 16, 6)),
@@ -547,7 +548,7 @@ SELECT CAST(? AS TIME),
      CURRENT_TIME,
      CURRENT_TIME(3)
 FROM test_sample.all_types;
-`, "20:34:58", "23:06:06", "22:06:06.011", "21:06:06.11111", "20:16:06",
+`, "20:34:58", "23:06:06", "22:06:06.011", "21:06:06.011111", "20:16:06",
 		"19:26:06", "18:36:06", "17:46:06", "16:56:56", "15:16:46", "14:26:36")
 
 	err := query.Query(db, &struct{}{})
@@ -624,7 +625,7 @@ func TestDateTimeExpressions(t *testing.T) {
 		AllTypes.DateTime.EQ(dateTime),
 
 		AllTypes.DateTimePtr.NOT_EQ(AllTypes.DateTime),
-		AllTypes.DateTimePtr.NOT_EQ(DateTime(2019, 6, 6, 10, 2, 46, 1000)),
+		AllTypes.DateTimePtr.NOT_EQ(DateTime(2019, 6, 6, 10, 2, 46, 100*time.Millisecond)),
 
 		AllTypes.DateTime.IS_DISTINCT_FROM(AllTypes.DateTime),
 		AllTypes.DateTime.IS_DISTINCT_FROM(dateTime),
@@ -654,7 +655,7 @@ func TestDateTimeExpressions(t *testing.T) {
 SELECT all_types.date_time = all_types.date_time,
      all_types.date_time = CAST('2019-06-06 10:02:46' AS DATETIME),
      all_types.date_time_ptr != all_types.date_time,
-     all_types.date_time_ptr != CAST('2019-06-06 10:02:46.1000' AS DATETIME),
+     all_types.date_time_ptr != CAST('2019-06-06 10:02:46.100' AS DATETIME),
      NOT(all_types.date_time <=> all_types.date_time),
      NOT(all_types.date_time <=> CAST('2019-06-06 10:02:46' AS DATETIME)),
      all_types.date_time <=> all_types.date_time,
@@ -686,7 +687,7 @@ func TestTimestampExpressions(t *testing.T) {
 		AllTypes.Timestamp.EQ(timestamp),
 
 		AllTypes.TimestampPtr.NOT_EQ(AllTypes.Timestamp),
-		AllTypes.TimestampPtr.NOT_EQ(Timestamp(2019, 6, 6, 10, 2, 46, 1000)),
+		AllTypes.TimestampPtr.NOT_EQ(Timestamp(2019, 6, 6, 10, 2, 46, 100*time.Millisecond)),
 
 		AllTypes.Timestamp.IS_DISTINCT_FROM(AllTypes.Timestamp),
 		AllTypes.Timestamp.IS_DISTINCT_FROM(timestamp),
@@ -716,7 +717,7 @@ func TestTimestampExpressions(t *testing.T) {
 SELECT all_types.timestamp = all_types.timestamp,
      all_types.timestamp = TIMESTAMP('2019-06-06 10:02:46'),
      all_types.timestamp_ptr != all_types.timestamp,
-     all_types.timestamp_ptr != TIMESTAMP('2019-06-06 10:02:46.1000'),
+     all_types.timestamp_ptr != TIMESTAMP('2019-06-06 10:02:46.100'),
      NOT(all_types.timestamp <=> all_types.timestamp),
      NOT(all_types.timestamp <=> TIMESTAMP('2019-06-06 10:02:46')),
      all_types.timestamp <=> all_types.timestamp,
@@ -751,11 +752,11 @@ func TestTimeLiterals(t *testing.T) {
 		Time(timeT.Clock()).AS("time"),
 		TimeT(timeT).AS("timeT"),
 		DateTimeT(timeT).AS("datetime"),
-		Timestamp(2019, 8, 6, 10, 10, 30, 123456).AS("timestamp"),
+		Timestamp(2019, 8, 6, 10, 10, 30, 123456*time.Millisecond).AS("timestamp"),
 		TimestampT(timeT).AS("timestampT"),
 	).FROM(AllTypes).LIMIT(1)
 
-	//fmt.Println(query.Sql())
+	fmt.Println(query.DebugSql())
 
 	testutils.AssertStatementSql(t, query, `
 SELECT CAST(? AS DATE) AS "date",
diff --git a/tests/postgres/alltypes_test.go b/tests/postgres/alltypes_test.go
index 5c9111f..e530c31 100644
--- a/tests/postgres/alltypes_test.go
+++ b/tests/postgres/alltypes_test.go
@@ -384,7 +384,7 @@ SELECT (all_types.numeric = all_types.numeric) AS "eq1",
      TRUNC(ABS(all_types.decimal), $29) AS "abs",
      TRUNC(POWER(all_types.decimal, $30), $31) AS "power",
      TRUNC(SQRT(all_types.decimal), $32) AS "sqrt",
-     TRUNC(CBRT(all_types.decimal)::DECIMAL, $33) AS "cbrt",
+     TRUNC(CBRT(all_types.decimal)::decimal, $33) AS "cbrt",
      CEIL(all_types.real) AS "ceil",
      FLOOR(all_types.real) AS "floor",
      ROUND(all_types.decimal) AS "round1",
@@ -552,22 +552,22 @@ func TestTimeExpression(t *testing.T) {
 		AllTypes.Time.EQ(AllTypes.Time),
 		AllTypes.Time.EQ(Time(23, 6, 6, 1)),
 		AllTypes.Timez.EQ(AllTypes.TimezPtr),
-		AllTypes.Timez.EQ(Timez(23, 6, 6, 222, +200)),
+		AllTypes.Timez.EQ(Timez(23, 6, 6, 222, "+200")),
 		AllTypes.Timestamp.EQ(AllTypes.TimestampPtr),
 		AllTypes.Timestamp.EQ(Timestamp(2010, 10, 21, 15, 30, 12, 333)),
 		AllTypes.Timestampz.EQ(AllTypes.TimestampzPtr),
-		AllTypes.Timestampz.EQ(Timestampz(2010, 10, 21, 15, 30, 12, 444, 0)),
+		AllTypes.Timestampz.EQ(Timestampz(2010, 10, 21, 15, 30, 12, 444, "PST")),
 		AllTypes.Date.EQ(AllTypes.DatePtr),
 		AllTypes.Date.EQ(Date(2010, 12, 3)),
 
 		AllTypes.Time.NOT_EQ(AllTypes.Time),
 		AllTypes.Time.NOT_EQ(Time(23, 6, 6, 10)),
 		AllTypes.Timez.NOT_EQ(AllTypes.TimezPtr),
-		AllTypes.Timez.NOT_EQ(Timez(23, 6, 6, 555, +200)),
+		AllTypes.Timez.NOT_EQ(Timez(23, 6, 6, 555, "+4:00")),
 		AllTypes.Timestamp.NOT_EQ(AllTypes.TimestampPtr),
 		AllTypes.Timestamp.NOT_EQ(Timestamp(2010, 10, 21, 15, 30, 12, 666)),
 		AllTypes.Timestampz.NOT_EQ(AllTypes.TimestampzPtr),
-		AllTypes.Timestampz.NOT_EQ(Timestampz(2010, 10, 21, 15, 30, 12, 777, 0)),
+		AllTypes.Timestampz.NOT_EQ(Timestampz(2010, 10, 21, 15, 30, 12, 777, "UTC")),
 		AllTypes.Date.NOT_EQ(AllTypes.DatePtr),
 		AllTypes.Date.NOT_EQ(Date(2010, 12, 3)),
 
@@ -803,7 +803,7 @@ func TestTimeLiterals(t *testing.T) {
 	//fmt.Println(query.Sql())
 
 	testutils.AssertStatementSql(t, query, `
-SELECT $1::DATE AS "date",
+SELECT $1::date AS "date",
      $2::time without time zone AS "time",
      $3::time with time zone AS "timez",
      $4::timestamp without time zone AS "timestamp",
diff --git a/tests/postgres/select_test.go b/tests/postgres/select_test.go
index 833a7b5..066f64c 100644
--- a/tests/postgres/select_test.go
+++ b/tests/postgres/select_test.go
@@ -10,6 +10,7 @@ import (
 	. "github.com/go-jet/jet/tests/.gentestdata/jetdb/dvds/table"
 	"gotest.tools/assert"
 	"testing"
+	"time"
 )
 
 func TestSelect_ScanToStruct(t *testing.T) {
@@ -1185,15 +1186,15 @@ SELECT payment.payment_id AS "payment.payment_id",
      payment.amount AS "payment.amount",
      payment.payment_date AS "payment.payment_date"
 FROM dvds.payment
-WHERE payment.payment_date < '2007-02-14 22:16:01.000'::timestamp without time zone
+WHERE payment.payment_date < '2007-02-14 22:16:01'::timestamp without time zone
 ORDER BY payment.payment_date ASC;
 `
 
 	query := Payment.SELECT(Payment.AllColumns).
-		WHERE(Payment.PaymentDate.LT(Timestamp(2007, 02, 14, 22, 16, 01, 0))).
+		WHERE(Payment.PaymentDate.LT(Timestamp(2007, time.February, 14, 22, 16, 01, 0))).
 		ORDER_BY(Payment.PaymentDate.ASC())
 
-	testutils.AssertDebugStatementSql(t, query, expectedSQL, "2007-02-14 22:16:01.000")
+	testutils.AssertDebugStatementSql(t, query, expectedSQL, "2007-02-14 22:16:01")
 
 	payments := []model.Payment{}