import time
            j = 1
            for classperiod in periods:
                
                try:
                    startTime = time.strptime(classperiod[0], "%I:%M %p")
                except ValueError:
                    try:
                        startTime = time.strptime(classperiod[0], "%I:%M%p")
                    except ValueError:
                        startTime = time.strptime(classperiod[0],"%H:%M")
                try:
                    endTime = time.strptime(classperiod[1], "%I:%M %p")
                except ValueError:
                    try:
                        endTime = time.strptime(classperiod[1], "%I:%M%p")
                    except ValueError:
                        endTime = time.strptime(classperiod[1], "%H:%M")