How to convert int to datetime in c#?

[nur alam]

I have two value, start and end. It stored in database. For example,
float start = 1316742254435;
float end = 1316742302359;

So how can I convert it into datetime and then time difference?

[mmsaffari]

Depending on what those numbers are, you may use one of DateTime.FromXX X methods to convert them into the corresponding DateTime object and subtracting two DateTime objects will result in a TimeSpan object.