I want add hours or minutes to current time

Question

I want to increase time to current time.

for example, I have the time of the problem and the expected time to complete them
How can I add?

 (Date         


        

Answer 1

Please note that you may add - (minus) sign to find minutes backwards

DateTime begin = new DateTime();
begin = DateTime.ParseExact("21:00:00", "H:m:s", null);

if (DateTime.Now < begin.AddMinutes(-15))
{
    //if time is before 19:45:00 show message etc...
}

and time forward

DateTime end = new DateTime();
end = DateTime.ParseExact("22:00:00", "H:m:s", null);


if (DateTime.Now > end.AddMinutes(15))
{
    //if time is greater than 22:15:00 do whatever you want
}