ffx_hd_console_seed_to_time.py

import datetime


def s32(integer: int) -> int:
    return ((integer & 0xffffffff) ^ 0x80000000) - 0x80000000


def datetime_to_seed(datetime: int) -> int:
    seed = s32(datetime + 1)
    seed = s32(s32(seed * 1108104919) + 11786)
    seed = s32(s32(seed * 1566083941) + 15413)
    seed = s32(s32(seed >> 16) + s32(seed << 16))
    if seed >= 0:
        return seed
    else:
        return 0x100000000 + seed


def main():
    target_seed = int(input('Seed: '))
    if target_seed not in POSSIBLE_SEEDS:
        print(f'Seed {target_seed} is not a possible HD seed')
        return
    dt = datetime.datetime.now()
    dt_limit = dt + ONE_HOUR
    print('Time now: ', dt.strftime('%m/%d/%Y %H:%M:%S'))
    current_seed = 0x100000000
    while target_seed != current_seed:
        dt = dt + ONE_SECOND
        xored_datetime = (dt.month
                          ^ dt.day
                          ^ int(hex(dt.year)[-2:], 16)
                          ^ dt.hour
                          ^ dt.minute
                          ^ dt.second
                          ^ 0b00010010)
        current_seed = datetime_to_seed(xored_datetime)
        if dt == dt_limit:
            year = (dt.year // 64 + 1) * 64
            dt = datetime.datetime(year=year, month=1, day=1)
            dt_limit = dt + ONE_HOUR
    dt = dt - ONE_SECOND
    print('Press new game at:', dt.strftime('%m/%d/%Y %H:%M:%S'))


POSSIBLE_SEEDS = [datetime_to_seed(i) for i in range(256)]
ONE_SECOND = datetime.timedelta(seconds=1)
ONE_HOUR = datetime.timedelta(hours=1)


if __name__ == '__main__':
    main()