如何获得给定日期和时间的 TimeSpan

Question

Is it possible to get the timespan of A and B, where A(MM-dd-yyyy) = 10-06-2015 23:45 and B = 9:00 AM . The given format of data are exactly what it is on this post. I guess am having trouble on formatting, no coded work yet.

I have other question that may linked to the first, is if(A>B) possible ? where A(MM-dd-yyyy) = 10-06-2015 23:45 and B = 9:00 AM . Does comparing the two data possible ?

Answer 1

DateTime a = DateTime.ParseExact( "10-06-2015 23:45"  , "MM-dd-yyyy HH:mm"   , CultureInfo.InvariantCulture );
DateTime b = DateTime.ParseExact( "10-06-2015 9:00 AM", "MM-dd-yyyy hh:mm tt", CultureInfo.InvariantCulture );
TimeSpan difference = a - b;

If you only know b by the time-of-day, then this works:

DateTime b = DateTime.ParseExact( "9:00 AM" "hh:mm tt", CultureInfo.InvariantCulture );
b = a.Date.Add( b.TimeOfDay );

TimeSpan difference = a - b;

You say you're using DateTimePicker , in which case:

DateTime a = dateTimePicker1.Value;
DateTime b = a.Date.Add( dateTimePicker2.TimeOfDay );
TimeSpan difference = a - b;

Answer 2

Use TimeOfDay for this.

This will also help.

Example: Define your times like this.

startDate='10-06-2015' startTime=10-06-2015 23:45:00 AM'

TimeSpan ts = startTime.TimeOfDay;
DateTime dt = startDate.Add(ts);