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MongoDB Tricks: Storing dates and Group By Day

Nice trick discovered after hitting a performance problem when having to group results by date:

So I quickly determined from this that I was storing the date and time in the wrong way. I need to split up the date and time. I now have this:

  “_id” : ObjectId(“4bfea7246c6151d127f80100”),
  “created” : { “d” : “2010-03-29”, “t” : “20:15:34” }

Note that using a timestamp would not work either. But I’m wondering if this is the only solution for grouping by day?