C# / .NET - subtract seconds from DateTime

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

1. DateTime.AddSeconds method example

DateTime time1 = new DateTime(2012, 1, 1, 12, 0, 40, 0);
DateTime time2 = time1.AddSeconds(-20);

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

Output:

Old time: 2012-01-01T12:00:40
New time: 2012-01-01T12:00:20

2. DateTime.Subtract method example

DateTime time1 = new DateTime(2012, 1, 1, 12, 0, 40, 0);
DateTime time2 = time1.Subtract(TimeSpan.FromSeconds(20));

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

Output:

Old time: 2012-01-01T12:00:40
New time: 2012-01-01T12:00:20

References

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