I was only able to find one other lonely soul with the same question. Since that has gone unanswered since 2011, I would like to ask the question again. I'm currently using ArcGIS Desktop in a mixed 10.0 and 10.2.2 environment.
If a geodatabase date field stores a full datetime value, how can you modify the time portion of the datetime value in ArcMap? I don't want to go through the hassle of calculating fields to display the time if the date field already has the time value buried in there somewhere.