Locale and timezone

A GISNIX machine has one preset locale — a bundle that sets the keyboard layout, timezone, system language and regional number/date formatting together, chosen from software/locale/. On top of that, you can override a single axis without changing the preset, which is what you want when only one thing needs to move — most often the clock, while travelling.

All of these write into the host's config.nix and take effect on your next gisnix update; nothing changes the running system until you rebuild.

Just the clock

To change only the timezone:

gisnix set-timezone

It offers every Region/City the system knows (type to filter — zurich, sao_paulo, auckland) and writes the choice as a timeZone override on this host. Your language, keyboard and formatting are untouched.

The whole locale

For anything beyond the clock — the preset itself, or the language and formatting axes — use:

gisnix locale            # show current settings, then a menu
gisnix locale --show     # just print them and exit

The menu lets you pick a different preset, or override one axis at a time:

• clock — the timezone (the same picker set-timezone gives you).
• language — the desktop and system language.
• formatting — number, date and currency conventions.

The travelling case makes the split clear: from a pt-en preset (Portugal, English desktop), override the clock to Europe/Zurich for a trip and leave everything else; clear the override when you get home and the preset's Europe/Lisbon returns. An override always wins over the preset for its one axis, and clearing it hands that axis back.

Full per-flag detail is in the commands reference (set-timezone, locale).