Convert Mongo Object Id to Readable

objectid-convert.py

import sys
import datetime

objectid = int(sys.argv[1], 16)
fmt = "%Y-%m-%d %H:%M:%S"

counter = objectid & 0xFFFFFF
shift = 24
process_id = (objectid >> shift) & 0xFFFF
shift += 16
machine_id = (objectid >> shift) & 0xFFFFFF
shift += 24
timestamp = (objectid >> shift) & 0xFFFFFFFF
shift += 32

t = datetime.datetime.fromtimestamp(timestamp).strftime(fmt)

print "Counter:\t%d" % counter
print "Process:\t%d" % process_id
print "Machine:\t%d" % machine_id
print "Time:\t\t%s" % t

assert shift == (12 * 8)