batches(gitlab) handle time with numeric timezone in webhook (#38250)

* handle time with numeric timezone

* update changelog

* add test case

CHANGELOG.md

@@ -34,6 +34,7 @@ All notable changes to Sourcegraph are documented in this file.
 - Code Insights: the commit indexer no longer errors when fetching commits from empty repositories and marks them as successfully indexed. [#39081](https://github.com/sourcegraph/sourcegraph/pull/38091)
 - The file view does not jump to the first selected line anymore when selecting multiple lines and the first selected line was out of view. [#38175](https://github.com/sourcegraph/sourcegraph/pull/38175)
 - Fixed an issue where multiple activations of the back button are required to navigate back to a previously selected line in a file [#38193](https://github.com/sourcegraph/sourcegraph/pull/38193)
+- Support timestamps with numeric timezone format from Gitlab's Webhook payload [#38250](https://github.com/sourcegraph/sourcegraph/pull/38250)
 
 ### Removed
 

internal/extsvc/gitlab/time.go

@@ -33,6 +33,14 @@ func (t *Time) UnmarshalJSON(data []byte) error {
 	dec, err := time.Parse("2006-01-02 15:04:05 MST", s)
 	if err == nil {
 		t.Time = dec
+		return nil
 	}
+
+	dec, err = time.Parse("2006-01-02 15:04:05 -0700", s)
+	if err == nil {
+		t.Time = dec
+		return nil
+	}
+
 	return err
 }

internal/extsvc/gitlab/time_test.go

@@ -8,6 +8,11 @@ import (
 
 func TestTimeUnmarshal(t *testing.T) {
 	t.Run("valid", func(t *testing.T) {
+		loc, err := time.LoadLocation("Europe/Berlin")
+		if err != nil {
+			t.Fatal(err)
+		}
+
 		for _, tc := range []struct {
 			input string
 			want  time.Time
@@ -24,6 +29,10 @@ func TestTimeUnmarshal(t *testing.T) {
 				input: "2020-06-24 00:05:18 UTC",
 				want:  time.Date(2020, 6, 24, 0, 5, 18, 0, time.UTC),
 			},
+			{
+				input: "2022-07-05 20:52:49 +0200",
+				want:  time.Date(2022, 7, 5, 20, 52, 49, 0, loc),
+			},
 		} {
 			t.Run(tc.input, func(t *testing.T) {
 				js, err := json.Marshal(tc.input)