How do I convert a double into a dateTime value in c#?

Question

I would like to convert a double in to a datetime.

This is not a conversion from Excel. I have a double representing seconds and would simply like it represented as time in minutes and seconds.

121.0005 = 2:01 mins

Answer 1

Use TimeSpan:

double seconds = 121.0005;
TimeSpan sp = TimeSpan.FromSeconds(seconds);
Console.Write(string.Format("{0} mins", sp.ToString(@"m\:ss")));

Answer 2

Instead of DateTime what you need is TimeSpan, since your input is representing a time value, not Date.

Use TimeSpan.FromSeconds method.

double sec = 121.0005;
TimeSpan ts = TimeSpan.FromSeconds(sec);