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C# / .NET - add hours to DateTime

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In C# / .NET it is possible to add hours to date in following way.

DateTime.AddHours method example

DateTime time1 = new DateTime(2000, 1, 1, 12, 00, 00, 500);
DateTime time2 = time1.AddHours(6);

Console.WriteLine("Time before: " + time1.ToString("o"));
Console.WriteLine("Time after: " + time2.ToString("o"));


Time before: 2000-01-01T12:00:00.5000000
Time after: 2000-01-01T18:00:00.5000000
  • time has been printed in console according to iso 8601 standard - check this link for more details.
  • DateTime.AddHours allows to subtract hours by typing negative numbers as argument.


  1. DateTime.AddHours Method - Microsoft Docs
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