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C# / .NET - add milliseconds to DateTime

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

DateTime.AddMilliseconds method example

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

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


Time before: 2000-01-01T12:00:00.5000000
Time after: 2000-01-01T12:00:01.0000000
  • time has been printed in console according to iso 8601 standard - check this link for more details.
  • DateTime.AddMilliseconds allows to subtract milliseconds by typing negative numbers as argument.


  1. DateTime.AddMillisecodns Method - Microsoft Docs

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