sanatize time to within microsecond accuracy

internal/sanitize/sanitize.go

@@ -48,7 +48,7 @@ func (q *Query) Sanitize(args ...interface{}) (string, error) {
 			case string:
 				str = QuoteString(arg)
 			case time.Time:
-				str = arg.Format("'2006-01-02 15:04:05.999999999Z07:00:00'")
+				str = arg.Truncate(time.Microsecond).Format("'2006-01-02 15:04:05.999999999Z07:00:00'")
 			default:
 				return "", errors.Errorf("invalid arg type: %T", arg)
 			}

internal/sanitize/sanitize_test.go

@@ -2,6 +2,7 @@ package sanitize_test
 
 import (
 	"testing"
+	"time"
 
 	"github.com/jackc/pgx/v4/internal/sanitize"
 )
@@ -130,6 +131,11 @@ func TestQuerySanitize(t *testing.T) {
 			args:     []interface{}{`foo\'bar`},
 			expected: `select 'foo\''bar'`,
 		},
+		{
+			query:    sanitize.Query{Parts: []sanitize.Part{"insert ", 1}},
+			args:     []interface{}{time.Date(2020, time.March, 1, 23, 59, 59, 999999999, time.UTC)},
+			expected: `insert '2020-03-01 23:59:59.999999Z'`,
+		},
 	}
 
 	for i, tt := range successfulTests {