We configured in IAM the extended property CustomTimeMask with value ‘H:mm’ to hide the seconds for time and date time fields.
But with Universal 2025.3+, this seems not longer supported. It is still coming now including the seconds:

In IAM we only have option to show the date part in some different format, but the time part is not taken into account.

Is there an option to have the (date)time fields showed again without seconds as that detailed level is not needed?
Best answer by Leroy Witteveen
Hi @HJ van Dalfsen,
Is there an option to have the (date)time fields showed again without seconds as that detailed level is not needed?
You can accomplish this using the control DATETIME_SHORT:
Displays a calendar for selecting the date and a time format in hours and minutes (no seconds).
https://docs.thinkwisesoftware.com/docs/sf/domains#available-domain-controls
CustomDateMask/CustomDateTimeMask/CustomTimeMask are all not supported and will not be supported in Universal indeed.
Kind regards,
Leroy Witteveen