timespan - VB.net Get total time between two time spans -


i wondering if there function vb.net can tell me total time 2 different time spans have in common.

for example, have these 2 different time spans: 

1st date : (2013-01-01 8:30 am) - (2013-01-01 11:30pm) 2nd date : (2013-01-01 10:00 pm) - (2013-01-02 6:00 am)

can vb.net tell me answer 1 hour , 30 mins? (perhaps in decimal) 1 hour , 30 minutes because 10:00pm in evening , 11:30 in evening falls in other time span.

summary:

i need function tell me how many hours in timespan part of night shift. (that's 10:00 pm 6:00 am).

date1 , date2 represents first time span , date2 , date3 represent second time span. if order of dates changed have define analogous else first if. 

    dim date1 date = #1/1/2013 8:30:00 am#     dim date2 date = #1/1/2013 11:30:00 pm#     dim date3 date = #1/1/2013 10:00:00 pm#     dim date4 date = #1/2/2013 6:00:00 am#     dim timeperiod timespan      if date3.date >= date1.date , date3.date <= date2.date         if date4.date <= date2.date             timeperiod = date4.timeofday - date3.timeofday         else             timeperiod = date2.timeofday - date3.timeofday         end if     end if     msgbox(timeperiod.tostring)

edit: timeperiod = date4- date3 convert difference timespan

edit 2:the code above have returned date2-date3 if there there no common time span. code below return 0 in such case. when comparing 2 date variables in if statement, timeofday part neglected.

        dim date1 date = #1/1/2013 8:30:00 am#         dim date2 date = #1/1/2013 11:30:00 pm#         dim date3 date = #1/1/2013 10:00:00 pm#         dim date4 date = #1/2/2013 6:00:00 am#         dim timeperiod timespan         if date3 >= date1 , date3 <= date2             if date4 <= date2                 timeperiod = date4 - date3                               elseif date3 < date2                                    timeperiod = date2 - date3             elseif date3.date = date2.date                                     if date3.timeofday < date2.timeofday                                             timeperiod = date2 - date3                 else                 timeperiod = timespan.fromdays(0)                 end if             else                 timeperiod = timespan.fromdays(0)             end if         end if         msgbox(timeperiod.tostring)

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