On the ArcGIS Pro --> Options --> Units page we can customize Area, Distance, Location etc. units. It would be great if we could customize time units too, like date/time fields in attribute tables. Now, ArcGIS relies on the time display settings of the system. But what should I do if I would like to print a time value (and store as a time value) like yyyy-MM-dd HH:mm:ss.fff (with millisecond values) in the attribute table (without python formatting and conversion to string)? Currently, it is impossible to set certain (like the previously mentioned) formats in the time settings of the system.