c# - Differentiate time spans between 8am-9am and 8pm-9pm, etc -

i'm looking way differentiate time spans, example, between 8am-9am , 8pm-9pm, 10am-12pm , 10pm-12am, etc. in .net.

since time relative, i'm looking creative way on how achieve this.

here's i've tried far:

// 3:41pm - 4:41pm  datestart: 5/7/2015 3:41:41 pm dateexpire: 5/7/2015 4:41:41 pm  dateexpire.subtract(datestart): 01:00:00 tounixepoctime(datestart): 1431013301 tounixepoctime(dateexpire): 1431016901 int timespan = tounixepoctime(dateexpire) - tounixepoctime(datestart); timespan: 3600   // 4:41pm - 5:41pm datestart: 5/7/2015 4:41:41 pm dateexpire: 5/7/2015 5:41:41 pm dateexpire.subtract(datestart): 01:00:00 tounixepoctime(datestart): 1431016901 tounixepoctime(dateexpire): 1431020501 int timespan = tounixepoctime(dateexpire) - tounixepoctime(datestart); timespan: 3600 

... i'm not sure why these results surprised me make sense - it's basic subtraction.

as stated, timespan time interval. time intervals 8am-9am , 8pm-9pm same - 1 hour. if want differentiate them, create own class hold start , end time of each interval , use these values compare objects:

public class daterange {     public daterange(datetime start, datetime end)     {         if (end < start)            throw new argumentexception("end");          start = start;         end = end;     }      public datetime start { get; private set; }     public datetime end { get; private set; }     public timespan duration { { return end - start; }}      public override bool equals(object obj)     {         daterange other = obj daterange;         if (other == null)            return false;          return start == other.start && end == other.end;     }     // override gethashcode } 

now if have 2 date ranges

var morningrange = new daterange(8amtime, 9amtime); var eveningrange = new daterange(8pmtime, 9pmtime); 

they not same, duration same

morningrange.duration == eveningrange.duration // true morningrange.equals(eveningrange) // false 

you can define == , != operators

public static bool operator== (daterange x, daterange y) {     if (object.referenceequals(x, y))         return true;      if (((object)x == null) || ((object)y == null))         return false;      return x.equals(y); }  public static bool operator !=(daterange x, daterange y) {     return !(x == y); } 

now comparison more easy

morningrange == eveningrange // false morningrange != eveningrange // true