#!/usr/bin/env python
import datetime
import calendar
import time
import sys
import re
from optparse import OptionParser

# Author: Joakim Svendsen, "joakimbs" using Google's mail services.
# Copyright (c) 2013. Svendsen Tech. All rights reserved.

parser = OptionParser()
parser.add_option("-n", "--nano2date", type="long", dest="nano_time",
                  help="Specify a Windows nanosecond (AD) timestamp to convert to a date/time.")
parser.add_option("-d", "--date2nano", dest="human_datetime",
                  help="Specify a date and time string in the format: \"yyyy-MM-ddTHH:mm:ss\" to be converted to a \
                  Windows nanosecond (AD) timestamp. Example: \"2013-01-01T17:00:00\"")

(options, args) = parser.parse_args()

if options.nano_time:
    seconds = options.nano_time / 10000000
    epoch = seconds - 11644473600
    
    dt = datetime.datetime(2000, 1, 1, 0, 0, 0)
    print dt.fromtimestamp(epoch)

if options.human_datetime:
    m = re.compile(r'^(\d{4})-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)$').match(options.human_datetime)
    if m:
        dt = datetime.datetime(*map(int, m.groups()))
        #unix_timestamp = time.mktime(dt.timetuple())
        windows_timestamp = long((time.mktime(dt.timetuple()) + 11644473600) * 10000000)
        print windows_timestamp
    else:
        print "Invalid date format specified with --date2nano: " + options.human_datetime + \
            ".\nUse the --help parameter for more information."
        sys.exit()