What inspired this wish list request?
There is a plethora of posts in the Jmp Community concerning Date and Time data curation, e.g.
https://community.jmp.com/t5/Discussions/Manipulating-Timestamp/m-p/608408
https://community.jmp.com/t5/Discussions/Unix-Timestamp-to-Real-Date-time/m-p/14947
https://community.jmp.com/t5/Discussions/Changing-Date-Format/m-p/31189
https://community.jmp.com/t5/Discussions/Date-Time-Format-Problem/m-p/52831
https://community.jmp.com/t5/Discussions/Date-Format-help-please/m-p/236369
https://community.jmp.com/t5/Discussions/change-date-format/m-p/226382
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.
