@GETDATETIME[[date time][,title]] :Display a date/time picker dialog and returns the selected date in yyyy-mm-dd hh:mm:ss format.
You can optionally pass a default date and time (also in yyyy-mm-dd hh:mm:ss format). If you do not specify a default date, @GETDATETIME will use the current date and time.
You can also optionally pass a default title, which will replace the default "Date/Time" in the title bar.
Example:
echo %@getdatetime[]
