fix: BC for timestamp

Author: jozolam

timestamp.go

@@ -4,6 +4,7 @@ import (
 	"database/sql/driver"
 	"encoding/binary"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/jackc/pgio"
@@ -118,6 +119,15 @@ func (dst *Timestamp) DecodeText(ci *ConnInfo, src []byte) error {
 	case "-infinity":
 		*dst = Timestamp{Status: Present, InfinityModifier: -Infinity}
 	default:
+		if strings.HasSuffix(sbuf, " BC") {
+			t, err := time.Parse(pgTimestampFormat, strings.TrimRight(sbuf, " BC"))
+			t2 := time.Date(1-t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), t.Location())
+			if err != nil {
+				return err
+			}
+			*dst = Timestamp{Time: t2, Status: Present}
+			return nil
+		}
 		tim, err := time.Parse(pgTimestampFormat, sbuf)
 		if err != nil {
 			return err

timestamp_test.go

@@ -124,6 +124,7 @@ func TestTimestampSet(t *testing.T) {
 		{source: pgtype.Infinity, result: pgtype.Timestamp{InfinityModifier: pgtype.Infinity, Status: pgtype.Present}},
 		{source: pgtype.NegativeInfinity, result: pgtype.Timestamp{InfinityModifier: pgtype.NegativeInfinity, Status: pgtype.Present}},
 		{source: "2001-04-05 06:07:08", result: pgtype.Timestamp{Time: time.Date(2001, 4, 5, 6, 7, 8, 0, time.UTC), Status: pgtype.Present}},
+		{source: "0001-01-01 00:00:00.000000000 BC", result: pgtype.Timestamp{Time: time.Date(0000, 01, 01, 0, 0, 0, 0, time.UTC), Status: pgtype.Present}},
 	}
 
 	for i, tt := range successfulTests {