Source code for Time

class Time(object):
    def __init__(self, h, m, s):
        """Store time internally as seconds """
        self.sec = s + m*60 + h*60*60
        
    def __str__(self):
        """ Print time externally as military time """
        h = self.sec/3600
        m = (self.sec-(h*3600))/60
        s = self.sec - h*3600 - m*60
        return '%02d:%02d:%02d' %(h,m,s)
    
    def convert(self):
        """ Convert time to its input form """
        h = self.sec/(3600)
        m = (self.sec - h*3600)/60
        s = self.sec - h*3600 - m*60
        return (h,m,s)
        
    def __add__(self, other):
        """ Take in time object, add to self, return new time object
        """
        (h,m,s) = self.convert()
        newTime = Time(h,m,s)
        
        newTime.sec += other.sec
        if newTime.sec >= 86400:
            newTime -= 86400
        
        return newTime
    
    def __sub__(self, other):
        """ Time in time object, subtract from self, return new time object
        """
        
        (h,m,s) = self.convert()
        newTime = Time(h,m,s)
        
        newTime.sec -= other.sec
        if newTime.sec < 0:
            newTime.sec = 0
        
        return newTime
    
    def am_or_pm(self):
        """ Is Time before or after 12:00:00 """
        if self.sec < 43200:
            return "AM"
        else:
            return "PM"
        
if __name__ == "__main__":
    time1 = Time(5,5,5)
    time2 = Time(12,0,0)
    print str(time1+time2)
    print str(time2-time1)
    print time2.am_or_pm()
    print time1.am_or_pm()