What inspired this wish list request? 
There is a plethora of posts in the Jmp Community concerning Date and Time data curation, e.g. 
Manipulating Timestamp 
Unix Timestamp to Real Date & time 
Changing Date Format 
Date-Time Format Problem 
Date Format help please 
change date format 
 
There are some tools which help a lot - but any improvement will help 
 
For time & date columns the user can select from a long list of standard settings and even specify a custom pattern.
BuiltIn presets can be concatenate to construct the desired pattern.
 
Unfortunately, every time the user has to construct a pattern he has to start from scratch.
 
What is the improvement you would like to see? 
Please add a history to the custom date/time pattern dialog window.
 
 
Why is this idea important?
If a user uses a pattern once, there is a large chance that he will use it again.
With the history aavailable in the dialog window, it will be much easier to use the Format Pattern window:
Invest the time once to generate the pattern and enjoy it for the rest of your live.
 

 
 
 
 
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