Timezone earlier/later is incorrect.
version 3.36.2 Ubuntu Focal 20.04
When an timezone is added and the timezone is ahead of one's own timezone, the display on the list of cities actually shows "later" instead of "earlier".
Example:
I'n Cape Town, the time is 15:00 and add Tokyo where the time is 22:00. Tokyo is 7 hours ahead (or earlier) than Cape Town. The display however says it's 7 hours later. That's wrong. 22:00 is ahead of 15:00. Cape Town only reached 22:00 in seven hours, so Tokyo is 7 hours earlier.
I fully realise that there may be end-users who can't get the logic of earlier and later or before and after, so maybe setting this as a user-configurable parameter may be a good idea. In that way people can pick whatever they prefer and understand, be technically correct or not.