This is a simple workflow to display the current time at different cities of the world. To add new cities we need to edit the Script Filter in the workflow.  For example to add a city Tokyo, we need to add another string "Asia/Tokyo" to the name of list. We need to edit only one line and all the rest of the code does not need to be edited. The names of timezones can be found in this wikipedia page: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones