Hi Ben, Ben Sturmfels skribis: > I've downloaded the source with `guix build --source > evolution-data-server`, extracted and found the the function > "e_cal_util_get_system_timezone()" at src/calendar/libecal/e-cal-util.c:1507 > which calls down to "system_timezone_find()" in e-cal-system-timezone.c:522 > where it looks up the timezone and compares it to a list of valid zones. Looking more closely, ‘system_timezone_find’ first tries to see if /etc/localtime is a symlink and if yes reads its target (but it’s never a symlink, AFAIK), and later on tries to compare /etc/localtime to files found under ‘SYSTEM_ZONEINFODIR’. Problem is: #define SYSTEM_ZONEINFODIR "/usr/share/zoneinfo" So probably, if you substitute “/usr/” with the prefix of the ‘tzdata’ package, it’ll work much better. :-) Let me know how it goes! Ludo’.