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C# / .NET - subtract days from DateTime

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

1. DateTime.AddDays method example

DateTime time1 = new DateTime(2012, 1, 20, 12, 0, 0, 0);
DateTime time2 = time1.AddDays(-10);

Console.WriteLine($"Old time: {time1:s}");
Console.WriteLine($"New time: {time2:s}");

Output:

Old time: 2012-01-20T12:00:00
New time: 2012-01-10T12:00:00

2. DateTime.Subtract method example

DateTime time1 = new DateTime(2012, 1, 20, 12, 0, 0, 0);
DateTime time2 = time1.Subtract(TimeSpan.FromDays(10));

Console.WriteLine($"Old time: {time1:s}");
Console.WriteLine($"New time: {time2:s}");

Output:

Old time: 2012-01-20T12:00:00
New time: 2012-01-10T12:00:00

References

  1. DateTime.AddDays Method - Microsoft docs
  2. DateTime.Subtract Method - Microsoft docs
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