applets/digital-clock: show offsets for other time zones

Nate Grahamrequested to merge
work/ngraham/add-time-offsets into master

Reason for the change

Show the offset from your current time for each time zone, giving you more of a feel for how much farther ahead or behind each time zone is.

Test plan

  1. Add multiple time zones using the widget
  2. Open the widget or show its tooltip

Screenshots or screen recordings

Before After
time_zones_before time_zones_after

Bugs fixed

N/A

Merge request reports