On 2019-12-31, at 16:46:00, Paul Eggert wrote:
... That's old news. Please see Internet RFC 8536 section 3.3.1 and <http://austingroupbugs.net/view.php?id=1252>.
My apologies for the pleonasm; I excerpted bug 1252 and RFC 8536 to IBM-MAIN. In fact the user reporting the problem is in Israel. I see: https://en.wikipedia.org/wiki/Israel_Summer_Time#2013%E2%80%93Present If the end of IDT falls on Rosh Hashana, the Jewish New Year, then IDT will end on the first Monday after October 1.[8] On July 8, 2013, the Israeli Knesset approved the bill to extend IDT even further. According to the bill, IDT will begin on the Friday before the last Sunday of March, and end on the last Sunday of October.[9] So it depends on the Metonic Cycle. POSIX format is unlikely to handle that. Thanks, gil