What are valid custom oid data types

I am trying to add the following mibs.

This is the peak power in Amps, the date of the peak power measurement, and the date of the last reset of the peak power mib to zero. The Amps work but I get invalid data for the other two in a little red balloon at the top of the screen. It is valid data since it is the date but librenms doesn’t seem to like that data type.