diff --git a/test/test_utils.py b/test/test_utils.py
index 9a5e3f0f0d..d84c3d3eef 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -1390,21 +1390,21 @@ def test_dfxp2srt(self):
   </body>
 </tt>'''.encode('utf-8')
         srt_data = '''1
-00:00:02,080 --> 00:00:05,839
+00:00:02,080 --> 00:00:05,840
 <font color="white" face="sansSerif" size="16">default style<font color="red">custom style</font></font>
 
 2
-00:00:02,080 --> 00:00:05,839
+00:00:02,080 --> 00:00:05,840
 <b><font color="cyan" face="sansSerif" size="16"><font color="lime">part 1
 </font>part 2</font></b>
 
 3
-00:00:05,839 --> 00:00:09,560
+00:00:05,840 --> 00:00:09,560
 <u><font color="lime">line 3
 part 3</font></u>
 
 4
-00:00:09,560 --> 00:00:12,359
+00:00:09,560 --> 00:00:12,360
 <i><u><font color="yellow"><font color="lime">inner
  </font>style</font></u></i>
 
diff --git a/yt_dlp/downloader/common.py b/yt_dlp/downloader/common.py
index 9081794dbc..6cfbb6657a 100644
--- a/yt_dlp/downloader/common.py
+++ b/yt_dlp/downloader/common.py
@@ -12,6 +12,7 @@
     format_bytes,
     shell_quote,
     timeconvert,
+    timetuple_from_msec,
 )
 from ..minicurses import (
     MultilineLogger,
@@ -75,14 +76,12 @@ def __init__(self, ydl, params):
 
     @staticmethod
     def format_seconds(seconds):
-        (mins, secs) = divmod(seconds, 60)
-        (hours, mins) = divmod(mins, 60)
-        if hours > 99:
+        time = timetuple_from_msec(seconds * 1000)
+        if time.hours > 99:
             return '--:--:--'
-        if hours == 0:
-            return '%02d:%02d' % (mins, secs)
-        else:
-            return '%02d:%02d:%02d' % (hours, mins, secs)
+        if not time.hours:
+            return '%02d:%02d' % time[1:-1]
+        return '%02d:%02d:%02d' % time[:-1]
 
     @staticmethod
     def calc_percent(byte_counter, data_len):
diff --git a/yt_dlp/extractor/adn.py b/yt_dlp/extractor/adn.py
index a55ebbcbd6..5a1283baa5 100644
--- a/yt_dlp/extractor/adn.py
+++ b/yt_dlp/extractor/adn.py
@@ -15,6 +15,7 @@
     compat_ord,
 )
 from ..utils import (
+    ass_subtitles_timecode,
     bytes_to_intlist,
     bytes_to_long,
     ExtractorError,
@@ -68,10 +69,6 @@ class ADNIE(InfoExtractor):
         'end': 4,
     }
 
-    @staticmethod
-    def _ass_subtitles_timecode(seconds):
-        return '%01d:%02d:%02d.%02d' % (seconds / 3600, (seconds % 3600) / 60, seconds % 60, (seconds % 1) * 100)
-
     def _get_subtitles(self, sub_url, video_id):
         if not sub_url:
             return None
@@ -117,8 +114,8 @@ def _get_subtitles(self, sub_url, video_id):
                     continue
                 alignment = self._POS_ALIGN_MAP.get(position_align, 2) + self._LINE_ALIGN_MAP.get(line_align, 0)
                 ssa += os.linesep + 'Dialogue: Marked=0,%s,%s,Default,,0,0,0,,%s%s' % (
-                    self._ass_subtitles_timecode(start),
-                    self._ass_subtitles_timecode(end),
+                    ass_subtitles_timecode(start),
+                    ass_subtitles_timecode(end),
                     '{\\a%d}' % alignment if alignment != 2 else '',
                     text.replace('\n', '\\N').replace('<i>', '{\\i1}').replace('</i>', '{\\i0}'))
 
diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index 28431ac733..b88257bc27 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -2342,14 +2342,25 @@ def decodeOption(optval):
     return optval
 
 
+_timetuple = collections.namedtuple('Time', ('hours', 'minutes', 'seconds', 'milliseconds'))
+
+
+def timetuple_from_msec(msec):
+    secs, msec = divmod(msec, 1000)
+    mins, secs = divmod(secs, 60)
+    hrs, mins = divmod(mins, 60)
+    return _timetuple(hrs, mins, secs, msec)
+
+
 def formatSeconds(secs, delim=':', msec=False):
-    if secs > 3600:
-        ret = '%d%s%02d%s%02d' % (secs // 3600, delim, (secs % 3600) // 60, delim, secs % 60)
-    elif secs > 60:
-        ret = '%d%s%02d' % (secs // 60, delim, secs % 60)
+    time = timetuple_from_msec(secs * 1000)
+    if time.hours:
+        ret = '%d%s%02d%s%02d' % (time.hours, delim, time.minutes, delim, time.seconds)
+    elif time.minutes:
+        ret = '%d%s%02d' % (time.minutes, delim, time.seconds)
     else:
-        ret = '%d' % secs
-    return '%s.%03d' % (ret, secs % 1) if msec else ret
+        ret = '%d' % time.seconds
+    return '%s.%03d' % (ret, time.milliseconds) if msec else ret
 
 
 def _ssl_load_windows_store_certs(ssl_context, storename):
@@ -4855,7 +4866,12 @@ def parse_dfxp_time_expr(time_expr):
 
 
 def srt_subtitles_timecode(seconds):
-    return '%02d:%02d:%02d,%03d' % (seconds / 3600, (seconds % 3600) / 60, seconds % 60, (seconds % 1) * 1000)
+    return '%02d:%02d:%02d,%03d' % timetuple_from_msec(seconds * 1000)
+
+
+def ass_subtitles_timecode(seconds):
+    time = timetuple_from_msec(seconds * 1000)
+    return '%01d:%02d:%02d.%02d' % (*time[:-1], time.milliseconds / 10)
 
 
 def dfxp2srt(dfxp_data):
diff --git a/yt_dlp/webvtt.py b/yt_dlp/webvtt.py
index cd936e7e5f..962aa57ad6 100644
--- a/yt_dlp/webvtt.py
+++ b/yt_dlp/webvtt.py
@@ -13,7 +13,7 @@
 
 import re
 import io
-from .utils import int_or_none
+from .utils import int_or_none, timetuple_from_msec
 from .compat import (
     compat_str as str,
     compat_Pattern,
@@ -124,11 +124,7 @@ def _format_ts(ts):
     Convert an MPEG PES timestamp into a WebVTT timestamp.
     This will lose sub-millisecond precision.
     """
-    msec = int((ts + 45) // 90)
-    secs, msec = divmod(msec, 1000)
-    mins, secs = divmod(secs, 60)
-    hrs, mins = divmod(mins, 60)
-    return '%02u:%02u:%02u.%03u' % (hrs, mins, secs, msec)
+    return '%02u:%02u:%02u.%03u' % timetuple_from_msec(int((ts + 45) // 90))
 
 
 class Block(object):