Add required DTSTART field

Author: AA-Turner

release_management/serialize.py

@@ -81,6 +81,8 @@ def create_release_schedule_calendar() -> str:
 def release_schedule_calendar_lines(
     releases: list[tuple[int, ReleaseInfo]], /
 ) -> list[str]:
+    dtstamp = dt.datetime.now(dt.timezone.utc).strftime('%Y%m%dT%H%M%SZ')
+
     lines = [
         'BEGIN:VCALENDAR',
         'VERSION:2.0',
@@ -98,9 +100,10 @@ def release_schedule_calendar_lines(
             note = ()
         lines += (
             'BEGIN:VEVENT',
-            f'SUMMARY:Python {release.stage}',
-            f'DTSTART;VALUE=DATE:{release.date.strftime("%Y%m%d")}',
+            f'DTSTAMP:{dtstamp}',
             f'UID:python-{normalised_stage}@releases.python.org',
+            f'DTSTART;VALUE=DATE:{release.date.strftime("%Y%m%d")}',
+            f'SUMMARY:Python {release.stage}',
             *note,
             f'URL:https://peps.python.org/pep-{pep_number:04d}/',
             'END:VEVENT',

release_management/tests/test_release_schedule_calendar.py

@@ -37,11 +37,13 @@ def test_create_release_calendar_first_event() -> None:
 
     # Assert
     assert cal_lines[5] == 'BEGIN:VEVENT'
-    assert cal_lines[6] == 'SUMMARY:Python X.Y.Z final'
-    assert cal_lines[7] == 'DTSTART;VALUE=DATE:20000101'
-    assert cal_lines[8] == 'UID:python-X.Y.Zfinal@releases.python.org'
-    assert cal_lines[9] == (
+    assert cal_lines[6].startswith('DTSTAMP:')
+    assert cal_lines[6].endswith('Z')
+    assert cal_lines[7] == 'UID:python-X.Y.Zfinal@releases.python.org'
+    assert cal_lines[8] == 'DTSTART;VALUE=DATE:20000101'
+    assert cal_lines[9] == 'SUMMARY:Python X.Y.Z final'
+    assert cal_lines[10] == (
         'DESCRIPTION:Note: These characters need escaping: \\\\ \\, \\; \\n'
     )
-    assert cal_lines[10] == 'URL:https://peps.python.org/pep-9999/'
-    assert cal_lines[11] == 'END:VEVENT'
+    assert cal_lines[11] == 'URL:https://peps.python.org/pep-9999/'
+    assert cal_lines[12] == 'END:VEVENT'