Pro 1.40 provides world clock feature.
Tip: To customize label text below the world clock. User can select "Custom" in Preference/Icon/Label Text. Then input code like 'London' ( ' is included) or other name.

In version Pro 1.31, feature to completely customize label text is added. User can select "Custom" in Preference/Icon/Label Text. Then input code.
E.g., code MMM displays Jul; code d/M displays 23/7; More, use ' to display plain text, like code 'MMM' producing MMM.
Note: The code format is based on Java DateFormat. See link below for more detail
http://developer.android.com/reference/java/text/SimpleDateFormat.html