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in C# how do you calculate date 25 years ago from today?
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The DateTime. Now property returns the current date and time, for example 2011-07-01 10:09.45310 . The DateTime. Today property returns the current date with the time compnents set to zero, for example 2011-07-01 00:00.00000 .
From MSDN you'll find that DateTime. Now has an approximate resolution of 10 milliseconds on all NT operating systems. The actual precision is hardware dependent. Better precision can be obtained using QueryPerformanceCounter .
DateTime is an immutable type, so you can't change it. However, you can create a new DateTime instance based on your previous instance.
ToString() − One more way to get the date from DateTime is using ToString() extension method. The advantage of using ToString() extension method is that we can specify the format of the date that we want to fetch. DateTime. Date − will also remove the time from the DateTime and provides us the Date only.
How about using AddYears:
DateTime then = DateTime.Today.AddYears(-25);
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