diff --git a/src/calibre/utils/date.py b/src/calibre/utils/date.py
index b25940d23d..c5fba13f57 100644
--- a/src/calibre/utils/date.py
+++ b/src/calibre/utils/date.py
@@ -44,7 +44,7 @@ parse_date_day_first = compute_locale_info_for_parse_date()
 utc_tz = _utc_tz = tzutc()
 local_tz = _local_tz = SafeLocalTimeZone()
 
-UNDEFINED_DATE = datetime(1000,1,1, tzinfo=utc_tz)
+UNDEFINED_DATE = datetime(101,1,1, tzinfo=utc_tz)
 
 def parse_date(date_string, assume_utc=False, as_utc=True, default=None):
     '''