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Is there any performance difference in using DateTime.Add(TimeSpan) vs. DateTime.AddDays(double), DateTime.AddHours(double), etc.?
Add(TimeSpan) calls AddTicks directly with the ._ticks member of the TimeSpan. AddDays, etc., do a multiplication and range check, then call AddTicks. So Add(TimeSpan) is probably fractionally faster, but almost certainly insignificantly so: all will be blindingly fast.