[C#] How to get HH:mm from two datetimes?

Question

hi there,

 

how to get Duration of log in and log out system in the format of HH:mm from two datetime?

 

I using this code:

 

DateTime now = DateTime.Now;

TimeSpan hrs = now - timein;

double z = hrs.TotalHours;

 

if using system for two hours

 

z = 2.700123 something like that. 

 

 it doesn't support my needed.

 

what I want is like: 

e.g

 

logintime                              logouttime                          duration 

06/04/2018 23:04:36           07/04/2018 23:05:08          HH:mm      or (e.g)  z=24:30 

  

format dd/MM/yyyy HH:mm:ss .

 

Mean 24 hrs and 30 minutes; after 30 minutes z=25:00 hrs. (not 24.5004343534). 

 

 Duration should be more than 24 hour upto days log in if using two days will display like 48:30........

 

 

How can I display that????

 

 

Best regard;