Hi, I just tried this with texlua 1.10.0: -------------------------------------------- local function time_of_day (TZ) os.setenv('TZ', TZ) local time = os.gettimeofday() print(os.date('%c', math.floor(time))) end time_of_day ('America/New_York') time_of_day ('Europe/Paris') time_of_day ('Asia/Tokyo') -------------------------------------------- It seems that os.setenv() is only executed once and all results are in Eastern Standard Time: Fri Feb 21 16:37:13 2020 Fri Feb 21 16:37:13 2020 Fri Feb 21 16:37:13 2020 When I call "time_of_day ('Asia/Tokyo')" first I get Sat Feb 22 06:39:46 2020 Sat Feb 22 06:39:46 2020 Sat Feb 22 06:39:46 2020 Is it possible to fix this behavior? Regards, Reinhard -- ------------------------------------------------------------------ Reinhard Kotucha Phone: +49-511-3373112 Marschnerstr. 25 D-30167 Hannover mailto:reinhard.kotucha@web.de ------------------------------------------------------------------