A simple estimated warranty date output script - calculates date as manufacture date of your Mac + 3 years

warrantydate.py

#!/usr/bin/python
import sys, datetime, time

def apple_year_offset(dateobj, years=0):
    # Convert to a maleable format
    mod_time = dateobj.timetuple()
    # Offset year by number of years
    mod_time = time.struct_time(tuple([mod_time[0]+years]) + mod_time[1:])
    # Convert back to a datetime obj
    return datetime.datetime.fromtimestamp(int(time.mktime(mod_time)))

def manufacture_date(serial):
    # http://www.macrumors.com/2010/04/16/apple-tweaks-serial-number-format-with-new-macbook-pro/
    est_date = u''
    if 10 < len(serial) < 13:
        if len(serial) == 11:
            # Old format
            year = serial[2].lower()
            est_year = 2000 + '   3456789012'.index(year)
            week = int(serial[3:5]) - 1
            year_time = datetime.date(year=est_year, month=1, day=1)
            if (week):
                week_dif = datetime.timedelta(weeks=week)
                year_time += week_dif
        else:
            # New format
            alpha_year = 'cdfghjklmnpqrstvwxyz'
            year = serial[3].lower()
            est_year = 2010 + (alpha_year.index(year) / 2)
            # 1st or 2nd half of the year
            est_half = alpha_year.index(year) % 2
            week = serial[4].lower()
            alpha_week = ' 123456789cdfghjklmnpqrtvwxy'
            est_week = alpha_week.index(week) + (est_half * 26) - 1
            year_time = datetime.date(year=est_year, month=1, day=1)
            if (est_week):
                week_dif = datetime.timedelta(weeks=est_week)
                year_time += week_dif
    return apple_year_offset(year_time, 3).strftime('%Y-%m-%d')

def main():
    try:
        serial = sys.argv[1].strip()
        print manufacture_date(serial)
    except:
        print "Error - Invalid Serial Number"
        sys.exit(1)

if __name__ == "__main__":
    main()