#!/usr/bin/env python3

import argparse
import datetime
import subprocess

def main():
    parser = argparse.ArgumentParser(description="Perform a git commit at a different time")
    parser.add_argument("--minus", type=int, default=0, help="Hours to subtract")
    parser.add_argument("--plus", type=int, default=0, help="Hours to add")
    parser.add_argument("message", type=str, help="The commit message")

    args = parser.parse_args()

    minus = datetime.timedelta(hours=args.minus)
    plus = datetime.timedelta(hours=args.plus)

    date = datetime.datetime.now().astimezone() - minus + plus
    formatted_date = date.strftime("%a %b %d %Y %H:%M:%S %z")

    env = {
        "GIT_AUTHOR_DATE": formatted_date,
        "GIT_COMMITTER_DATE": formatted_date
    }

    subprocess.call(["git", "commit", "-m", args.message, "--date", formatted_date], env=env)

if __name__ == "__main__":
    main()