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C# / .NET - subtract nanoseconds from DateTime

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Created by:

Elleanor-Williamson

380

In C# / .NET it is possible to subtract nanoseconds from DateTime object in following way.

1. `DateTime.AddTicks` method example

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long nanoseconds = 500;
​
DateTime time1 = new DateTime(2012, 1, 1, 12, 0, 0, 100);
DateTime time2 = time1.AddTicks(-nanoseconds / 100);
​
Console.WriteLine($"Old time: {time1:o}");
Console.WriteLine($"New time: {time2:o}");

Output:

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Old time: 2012-01-01T12:00:00.1000000
New time: 2012-01-01T12:00:00.0999995

Note: maximum precision for DateTime structure is 100 ns, so it is impossible to see difference during operating on times that are smaller than 100 ns.

2. `DateTime.Subtract` method example

Edit

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long nanoseconds = 500;
​
DateTime time1 = new DateTime(2012, 1, 1, 12, 0, 0, 100);
DateTime time2 = time1.Subtract(TimeSpan.FromTicks(nanoseconds / 100));
​
Console.WriteLine($"Old time: {time1:o}");
Console.WriteLine($"New time: {time2:o}");

Output:

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Old time: 2012-01-01T12:00:00.1000000
New time: 2012-01-01T12:00:00.0999995

Note: maximum precision for DateTime structure is 100 ns, so it is impossible to see difference during operating on times that are smaller than 100 ns.