Changing Time Zone

/usr/share/zoneinfo contains user time zones.

$ ls /usr/share/zoneinfo/                                          
Africa        EET           GMT0          MST           Singapore
America       EST           Greenwich     MST7MDT       Turkey
Antarctica    EST5EDT       HST           Mexico        UCT
Arctic        Egypt         Hongkong      NZ            US

To set system time, create a symlink to /etc/localtime:

$ doas ln -fs /usr/share/zoneinfo/America/New_York /etc/localtime
$ date
Wed Apr  3 12:33:24 EDT 2024

The date can be set manually:

$ doas date yyyymmddHHMM