diff --git a/yt_dlp/utils/_utils.py b/yt_dlp/utils/_utils.py
index c91a06e9a..7d79f417f 100644
--- a/yt_dlp/utils/_utils.py
+++ b/yt_dlp/utils/_utils.py
@@ -1285,7 +1285,7 @@ def unified_timestamp(date_str, day_first=True):
 
     timetuple = email.utils.parsedate_tz(date_str)
     if timetuple:
-        return calendar.timegm(timetuple) + pm_delta * 3600 - timezone.total_seconds()
+        return calendar.timegm(timetuple) + pm_delta * 3600 - int(timezone.total_seconds())
 
 
 @partial_application