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I question the need for having separate time and date-time tags. I think those concepts will rarely be distinct in terms of the questions we have here. What do you think? My inclination would be to merge date-time into time.
The time tag currently has 17 questions, and date-time currently has 58. Neither of them have a tag wiki. They seem to be used for exactly the same purpose.
I think we should 1) make date-time a synonym of time, 2) add a tag wiki for time, 3) retag questions that don't follow the new tag wiki.