Hello!
request to have the ability to add time zones:
(My Settings > Preferences) there is no Saskatchewan time zone.
On a Windows system the option is UTC-6:00 Saskatchewan
...
Technically you should be able to pick the "U.S. Central Time" option. (I acknowledge Canada is not part of the U.S. and correctly it should be correctly called "North American Central Time"). But in regard to the effect of this setting on your Lithium Community experience (formatting of time stamps within the UI and day start and end within LSI reporting) you will get the same experience as with a "UTC-6:00 Saskatchewan" option. 🕰️
If your community audience has a large enough population to warrant getting a dedicated setting entry for this time zone added. As VarunGrazitti pointed out please get in touch with your Lithium account resource to learn how this can be get done.