Bug fix: parsing iso8601 date strings

postgres/parser/pgdate/field_extract.go

@@ -175,6 +175,9 @@ func (fe *fieldExtract) Extract(s string) error {
 				return err
 			}
 
+		case "t":
+			continue
+
 		default:
 			// The most probable case is that we have a numeric input.
 			if err := appendNumber(chunk.NotMatch, match); err == nil {

postgres/parser/pgdate/parsing_test.go

@@ -0,0 +1,66 @@
+// Copyright 2025 Dolthub, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgdate
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseTimestamp(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected time.Time
+		hasError bool
+	}{
+		// Basic ISO 8601 formats
+		{"2025-03-24T19:21:59Z", time.Date(2025, 3, 24, 19, 21, 59, 0, time.UTC), false},
+		{"2025-03-24T19:21:59+00:00", time.Date(2025, 3, 24, 19, 21, 59, 0, time.FixedZone("+000000", 0)), false},
+		{"2025-03-24T19:21:59.690479+00:00", time.Date(2025, 3, 24, 19, 21, 59, 690479000, time.FixedZone("+000000", 0)), false},
+		{"2025-03-24", time.Date(2025, 3, 24, 0, 0, 0, 0, time.Local), false},
+
+		// Different time zone offsets
+		{"2025-03-24T19:21:59-05:00", time.Date(2025, 3, 24, 19, 21, 59, 0, time.FixedZone("-050000", -5*60*60)), false},
+		{"2025-03-24T19:21:59.123456+02:30", time.Date(2025, 3, 24, 19, 21, 59, 123456000, time.FixedZone("+023000", 2*60*60+30*60)), false},
+
+		// Edge cases
+		{"2024-02-29T12:34:56Z", time.Date(2024, 2, 29, 12, 34, 56, 0, time.UTC), false},  // Leap year
+		{"0001-01-01T00:00:00Z", time.Date(1, 1, 1, 0, 0, 0, 0, time.UTC), false},         // Minimum date
+		{"9999-12-31T23:59:59Z", time.Date(9999, 12, 31, 23, 59, 59, 0, time.UTC), false}, // Maximum date
+
+		// Invalid formats
+		{"24-03-2025T19:21:59Z", time.Time{}, true}, // Wrong date format
+		{"2025-03-24T25:00:00Z", time.Time{}, true}, // Invalid hour
+		{"2025-13-01T12:00:00Z", time.Time{}, true}, // Invalid month
+		{"2025-03-32T12:00:00Z", time.Time{}, true}, // Invalid day
+		{"2025-02-29T12:34:56Z", time.Time{}, true},
+		{"NotATimestamp", time.Time{}, true}, // Completely invalid
+	}
+
+	for _, test := range tests {
+		t.Run(test.input, func(t *testing.T) {
+			parsed, _, err := ParseTimestamp(time.Now(), ParseModeYMD, test.input)
+			if test.hasError {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				assert.Equal(t, test.expected, parsed)
+			}
+		})
+	}
+}

testing/go/insert_test.go

@@ -246,5 +246,17 @@ func TestInsert(t *testing.T) {
 				},
 			},
 		},
+		{
+			Name: "insert iso8601 timestamptz literal",
+			SetUpScript: []string{
+				"CREATE TABLE django_migrations (id serial primary key, app varchar, name varchar, applied timestamptz)",
+			},
+			Assertions: []ScriptTestAssertion{
+				{
+					Query:    `INSERT INTO "django_migrations" ("app", "name", "applied") VALUES ('contenttypes', '0001_initial', '2025-03-24T19:21:59.690479+00:00'::timestamptz) RETURNING "django_migrations"."id"`,
+					Expected: []sql.Row{{1}},
+				},
+			},
+		},
 	})
 }