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How to check if it is zero datetime in c#? What I mean zero datetime is: 01.01.0001 00:00:00
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Use model. myDate. HasValue. It will return true if date is not null otherwise false.
The value of this constant is equivalent to 00:00:00.0000000 UTC, January 1, 0001, in the Gregorian calendar. MinValue defines the date and time that is assigned to an uninitialized DateTime variable. The following example illustrates this. C# Copy.
You'll want to check against DateTime.MinValue
More info here
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You should check against default(DateTime)
The value of that is the same as DateTime.MinValue but formally default(T) is better. It is more readable and more in line with default(int) , which is 0 and very different from int.MinValue.
In a generic class, default(T) works for DateTime as it does for all built-in value types.
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