[utils] Add microseconds to unified_timestamp

test/test_utils.py

@@ -415,10 +415,12 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(unified_timestamp('Sep 11, 2013 | 5:49 AM'), 1378878540)
         self.assertEqual(unified_timestamp('December 15, 2017 at 7:49 am'), 1513324140)
         self.assertEqual(unified_timestamp('2018-03-14T08:32:43.1493874+00:00'), 1521016363)
+        self.assertEqual(unified_timestamp('2022-10-13T02:37:47.831Z'), 1665628667)
 
         self.assertEqual(unified_timestamp('December 31 1969 20:00:01 EDT'), 1)
         self.assertEqual(unified_timestamp('Wednesday 31 December 1969 18:01:26 MDT'), 86)
         self.assertEqual(unified_timestamp('12/31/1969 20:01:18 EDT', False), 78)
+        self.assertEqual(unified_timestamp('2023-03-09T18:01:33.646Z', with_milliseconds=True), 1678384893.646)
 
     def test_determine_ext(self):
         self.assertEqual(determine_ext('http://example.com/foo/bar.mp4/?download'), 'mp4')

yt_dlp/utils.py

@@ -1843,7 +1843,7 @@ def unified_strdate(date_str, day_first=True):
         return str(upload_date)
 
 
-def unified_timestamp(date_str, day_first=True):
+def unified_timestamp(date_str, day_first=True, with_milliseconds=False):
     if date_str is None:
         return None
 
@@ -1869,7 +1869,7 @@ def unified_timestamp(date_str, day_first=True):
     for expression in date_formats(day_first):
         with contextlib.suppress(ValueError):
             dt = datetime.datetime.strptime(date_str, expression) - timezone + datetime.timedelta(hours=pm_delta)
-            return calendar.timegm(dt.timetuple())
+            return calendar.timegm(dt.timetuple()) + (dt.microsecond/1e6 if with_milliseconds else 0)
 
     timetuple = email.utils.parsedate_tz(date_str)
     if timetuple: