import os
import time
from datetime import datetime, timedelta

def do(nYears):
    atime = datetime.now() + timedelta(nYears  * 365)
    atime = time.mktime(atime.timetuple())
    mtime = time.mktime(datetime.now().timetuple())    
    os.utime('test.txt', (atime, mtime))

if not os.path.exists('test.txt'):
    open('test.txt').write('a')

for i in range(1,100):
    do(i)
    print '%d ok' %i