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Why does ArcMap not display 12:00:00 AM in a date field?
12:00 AM is the internal default time set by a geodatabase when there is no user input for time in a date field. If a user manually inputs 12:00 AM into a date field, ArcGIS handles it as if it were not entered since it matches the default value and is not displayed in the date field. This is by design.
A geodatabase formats the date as 'datetime yyyy-mm-dd hh:mm:ss AM or PM'. By default, when a user does not input a time, the date field value is set to 12:00 AM. Similarly, when a user does not input a date, the date field value is set to December 30, 1899.