Hello Paul, I noticed that zdump on Windows from the latest git code now produces "localtime failed" and "gmtime failed" messages. Is that expected? Does it also happen on Linux? New behaviour with git code: zdump.exe -v d:\devsrc\treasure_test\iana\zoneinfo\iana\Africa\Abidjan d:\zoneinfo\iana\Africa\Abidjan -9223372036854775808 (gmtime failed) = -9223372036854775808 (localtime failed) d:\zoneinfo\iana\Africa\Abidjan -67768040609740801 (gmtime failed) = -67768040609740801 (localtime failed) d:\zoneinfo\iana\Africa\Abidjan Thu Jan 1 00:00:00 -2147481748 UT = -67768040609740800 (localtime failed) d:\zoneinfo\iana\Africa\Abidjan Thu Jan 1 00:16:07 -2147481748 UT = -67768040609739833 (localtime failed) d:\zoneinfo\iana\Africa\Abidjan Thu Jan 1 00:16:08 -2147481748 UT = Thu Jan 1 00:00:00 -2147481748 LMT isdst=0 gmtoff=-968 d:\zoneinfo\iana\Africa\Abidjan Mon Jan 1 00:16:07 1912 UT = Sun Dec 31 23:59:59 1911 LMT isdst=0 gmtoff=-968 d:\zoneinfo\iana\Africa\Abidjan Mon Jan 1 00:16:08 1912 UT = Mon Jan 1 00:16:08 1912 GMT isdst=0 gmtoff=0 d:\zoneinfo\iana\Africa\Abidjan Wed Dec 31 23:59:59 2147485547 UT = Wed Dec 31 23:59:59 2147485547 GMT isdst=0 gmtoff=0 d:\zoneinfo\iana\Africa\Abidjan 67768036191676800 (gmtime failed) = 67768036191676800 (localtime failed) d:\zoneinfo\iana\Africa\Abidjan 9223372036854775807 (gmtime failed) = 9223372036854775807 (localtime failed) Output from 2021e zdump.exe -v d:\zoneinfo\iana\Africa\Abidjan d:\zoneinfo\iana\Africa\Abidjan -9223372036854775808 = NULL d:\zoneinfo\iana\Africa\Abidjan -67768040609740801 = NULL d:\zoneinfo\iana\Africa\Abidjan Thu Jan 1 00:00:00 -2147481748 UT = NULL d:\zoneinfo\iana\Africa\Abidjan Thu Jan 1 00:16:07 -2147481748 UT = NULL d:\zoneinfo\iana\Africa\Abidjan Thu Jan 1 00:16:08 -2147481748 UT = Thu Jan 1 00:00:00 -2147481748 LMT isdst=0 gmtoff=-968 d:\zoneinfo\iana\Africa\Abidjan Mon Jan 1 00:16:07 1912 UT = Sun Dec 31 23:59:59 1911 LMT isdst=0 gmtoff=-968 d:\zoneinfo\iana\Africa\Abidjan Mon Jan 1 00:16:08 1912 UT = Mon Jan 1 00:16:08 1912 GMT isdst=0 gmtoff=0 d:\zoneinfo\iana\Africa\Abidjan Wed Dec 31 23:59:59 2147485547 UT = Wed Dec 31 23:59:59 2147485547 GMT isdst=0 gmtoff=0 d:\zoneinfo\iana\Africa\Abidjan 67768036191676800 = NULL d:\zoneinfo\iana\Africa\Abidjan 9223372036854775807 = NULL Thank you! Regards Manuela Friedrich