Time Subtract

[M Riaz Bashir]

Hi Respected Seniors, Kindly let me know one or two examples, How may I subtract / "Diffrence" time. for example: string strStudentTime = "10:00"; string strSystemTime = "10:15"; I need difference. Thank you (Riaz Bashir)

[Hiren solanki]

You can use Timespan[^] when need any kind of difference between two dates or time.

Regards, Hiren. -"I don't know, I don't care, and it doesn't make any difference".

[Pete OHanlon]

As Hiren said, look at the TimeSpan class. Specifically, you'll need to read these values in (using TryParse) to a TimeSpan, and then you can get the difference from there.

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[Luc Pattyn]

You should not hold times, dates, or datetimes in strings; strings here are useful only for showing actual values to human users. Keep them in DateTime types instead, so you have all DateTime operators and methods available, including subtraction, which results in a TimeSpan. :)

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[dasblinkenlight]

If it is a 24-hour clock, and the format is fixed as hh:mm, you can do it in a very simple way, without the system classes:

private static int ParseTime(string s) {
return 60*int.Parse(s.Substring(0, 2)) + int.Parse(s.Substring(3));
}
...
var diffInMinutes = ParseTime(strSystemTime) - ParseTime(strSystemTime);

If your code needs to be more robust than that, you should use DateTime to parse your strings, and then use the "-" operator to obtain their difference.

[jschell]

If you have a time then you should use TimeSpan. If you have a timestamp then you should use DateTimeOffset (rather than DateTime.)