Unhandled Exception: ZeroDivisionError('float division',)

import time, datetime, calendar

def ttimes(d):
    currentdate = datetime.datetime.utcnow() #now
    currentdate = str(currentdate.replace(hour=00, minute=00, second=01, microsecond=00)) #zero out day
    st = int(calendar.timegm(time.strptime(currentdate, '%Y-%m-%d %H:%M:%S'))) #Now
    t = int(calendar.timegm(time.strptime(currentdate, '%Y-%m-%d %H:%M:%S')) - d * 24 * 3600) #minus d days
    interv = 1 * 24 * 3600
    result = []
    #date = t
    while t != st :
        date = t
        print date
        t += interv
        print t
        result.append({'time': int(t) * 1000,'value': int(s_db(date,t))})
    return json.dumps(result)

result.append({'time': int(t) * 1000,'value': int(s_db(date,t))})