alarm.py

import datetime
import time
alarm = datetime.datetime(2014, month, day, hour, minute)

while True:
    now = datetime.datetime.now()
    diff = alarm - now
    if diff.total_seconds() < 0:
        print "Alarm triggered"
        break
    else:
        print "{} seconds left to alarm".format(diff.total_seconds())

    time.sleep(60)