Getting time span between two times in C

Question

I have two textboxes  One for a clock in time and one for clock out  The times will be put in this format   Hours Minutes   Lets say I have clocked in at 7 00 AM and clocked out at 2 00 PM   With my current code  I get a difference of 2 hours  but it should be 7 hours  How would I do that in C   I was going to convert to the 24 hour  by letting the user select AM or PM  but I got confused   So  basically  how would I calculate the difference of hours between the two times   I tried this  but got 2 hours and not 7 when I plugged in the numbers   DateTime startTime   Convert ToDateTime textBox1 Text   DateTime endtime   Convert ToDateTime textBox2 Text    TimeSpan duration   startTime - endtime

User · Answer

Another way   longer   In VB net    Say 2300 Start and  0700 Finish next day    If tsStart   tsFinish Then                                Take Hours difference and adjust accordingly                             tsDifference   New TimeSpan  24 - tsStart Hours    tsFinish Hours  0  0                                 Add Minutes to Difference                             tsDifference   tsDifference Add New TimeSpan 0  Math Abs tsStart Minutes - tsFinish Minutes   0                                   Add Seonds to Difference                             tsDifference   tsDifference Add New TimeSpan 0  0  Math Abs tsStart Seconds - tsFinish Seconds

User · Answer

Two points    Check your inputs  I can t imagine a situation where you d get 2 hours by subtracting the time values you re talking about  If I do this       DateTime startTime   Convert ToDateTime  7 00 AM        DateTime endtime   Convert ToDateTime  2 00 PM        TimeSpan duration   startTime - endtime        I get -07 00 00 as the result  And even if I forget to provide the AM PM value       DateTime startTime   Convert ToDateTime  7 00        DateTime endtime   Convert ToDateTime  2 00        TimeSpan duration   startTime - endtime        I get 05 00 00  So either your inputs don t contain the values you have listed or you are in a machine environment where they are begin parsed in an unexpected way  Or you re not actually getting the results you are reporting  To find the difference between a start and end time  you need to do endTime - startTime  not the other way around

User · Answer

string startTime    7 00 AM   string endTime    2 00 PM    TimeSpan duration   DateTime Parse endTime  Subtract DateTime Parse startTime     Console WriteLine duration   Console ReadKey      Will output  07 00 00   It also works if the user input military time   string startTime    7 00   string endTime    14 00    TimeSpan duration   DateTime Parse endTime  Subtract DateTime Parse startTime     Console WriteLine duration   Console ReadKey      Outputs  07 00 00   To change the format  duration ToString   hh  mm    More info at  http   msdn microsoft com en-us library ee372287 aspx  Addendum   Over the years it has somewhat bothered me that this is the most popular answer I have ever given  the original answer never actually explained why the OP s code didn t work despite the fact that it is perfectly valid  The only reason it gets so many votes is because the post comes up on Google when people search for a combination of the terms  C     timespan   and  between

User · Answer

You could use the TimeSpan constructor which takes a long for Ticks    TimeSpan duration   new TimeSpan endtime Ticks - startTime Ticks

[c#] Getting time span between two times in C#?

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