Clock
Displays the current time in various time zones around the world in a customizable format on the screen.
Commands
Time format
clock format [new]
If new is provided, will set that as the new format, according to these rules. If omitted, will print out the current format.
Sorting
clock sort [order]
If order is provided, will set that as the new sorting order. If omitted, will print out the current sorting order. Valid values are:
None: Leaves the order as it is defined in the fileAlphabetical: Sorts them alphabetically by their time zone abbreviationTime: Sorts them according to the time they display in ascending order
Add time zone
clock add <timezones...>
Appends a time zone to the list of currently displayed time zones. The timezone parameter needs to be one of these abbreviations.
Remove time zone
clock remove <timezones...>
Removes a time zone from the list of currently displayed time zones. The timezone parameter needs to be one of these abbreviations.
Set up time zone display
clock display <timezone> <name>
Sets the display name for a time zone, instead of displaying the time zone identifier. So clock display jst JP clock would display JP clock before the time instead of JST.
Source
The latest source and information for this addon can be found on GitHub.