git_vanity.py

import commands
signature = "22"
statusOutput = commands.getstatusoutput('git show -s --format=%ct HEAD');
if statusOutput[0] is not 0:
    print("initial date fetching caused error "+statusOutput[1])
    exit()
initialDate = int(statusOutput[1])
date = initialDate
while True:
    statusOutput = commands.getstatusoutput('git show -s --format=%H HEAD');
    if statusOutput[0] is not 0:
        print("fetching commit hash caused error "+statusOutput[1])
        exit()
    commitHash = statusOutput[1]
    if commitHash[0:len(signature)] == signature:
        break
    date -= 1
    amendCommand = 'git commit --amend --no-edit --date "' + str(date) + '"'
    statusOutput = commands.getstatusoutput(amendCommand)
    if statusOutput[0] is not 0:
        print("amending caused error "+statusOutput[1])
        exit()
print('date changed by '+str(initialDate - date) + ' millis')