C# / .NET - subtract hours from DateTime

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

1. DateTime.AddHours method example

DateTime time1 = new DateTime(2012, 1, 1, 12, 0, 0, 0);
DateTime time2 = time1.AddHours(-6);

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

Output:

Old time: 2012-01-01T12:00:00
New time: 2012-01-01T06:00:00

2. DateTime.Subtract method example

DateTime time1 = new DateTime(2012, 1, 1, 12, 0, 0, 0);
DateTime time2 = time1.Subtract(TimeSpan.FromHours(6));

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

Output:

Old time: 2012-01-01T12:00:00
New time: 2012-01-01T06:00:00

References

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