Edward Tanguay Edward Tanguay - 1 year ago 182
C# Question

How can I format a nullable DateTime with ToString()?

How can I convert the nullable DateTime dt2 to a formatted string?

DateTime dt = DateTime.Now;
Console.WriteLine(dt.ToString("yyyy-MM-dd hh:mm:ss")); //works

DateTime? dt2 = DateTime.Now;
Console.WriteLine(dt2.ToString("yyyy-MM-dd hh:mm:ss")); //gives following error:

no overload to method ToString takes
one argument

Answer Source
Console.WriteLine(dt2 != null ? dt2.Value.ToString("yyyy-MM-dd hh:mm:ss") : "n/a");

EDIT: As stated in other comments, check that there is a non-null value.

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