#!/usr/bin/env python

import sys
from datetime import datetime, timedelta
#from optparse import OptionParser
import csv

def main():
    filename = sys.argv[1]

    td = int(sys.argv[2])

    try:
        fptr = open(filename, 'r')
    except IOError:
        print "Could not open %s" % filename
        sys.exit(1)

    reader = csv.reader(fptr)
    i = 0
    rows = []
    prevtime = 0
    for row in reader:
        time = row[2]
        if prevtime == time:
            i -= 1
        row[2] = " "+modtime(row[2].strip(), i*td)
        rows.append(row)
        i += 1
        prevtime = time

    fptr.close()

    try:
        fptr = open(filename, 'w')
    except IOError:
        print "Could not open %s" % filename
        sys.exit(1)

    writer = csv.writer(fptr)
    writer.writerows(rows)
    sys.exit(0)


def modtime(date, timedel):

    year    = int(date[0:4])
    month   = int(date[4:6])
    day     = int(date[6:8])
    hour    = int(date[8:10])

    date = datetime(year, month, day, hour)

    t = timedelta(hours=int(timedel))
    date += -(t)
    return date.strftime("%Y%m%d%H")


#############################################################
if __name__ == '__main__':
    main()