Enter and display datetime with seconds?

How can I have the user enter a datetime including seconds in Appian?  The date & time input control does not allow me to enter seconds (it clears the entire date/time value when I try)

How can I display the datetime back to the user with the seconds?  I do not see any display formatting for the date & time control.

It seems odd that this is not built-in... or if it is then I'm odd because I cannot find it.

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