import urllib, os, datetime, subprocess

def yearsago(years, from_date=None):
    if from_date is None:
        from_date = datetime.datetime.now().date()
    try:
        return from_date.replace(year=from_date.year - years)
    except:
        # Must be 2/29!
        assert from_date.month == 2 and from_date.day == 29 # can be removed
        return from_date.replace(month=2, day=28,
                                 year=from_date.year-years)

urlPre = 'http://chemistry.gravitywaves.com/logs/chatlog_'
urlDate = '11_11_08'
urlExt= '.log'

today = datetime.datetime.now().date()
startDate = yearsago(years=15)

while (startDate!=today):
    urlDate = startDate.strftime('%m_%d_%y')
    startDate += datetime.timedelta(days=1)
    temp=''.join((urlPre,urlDate,urlExt))
    print temp
    #urllib.urlretrieve(temp)
    subprocess.call(["wget", temp])