ffx_hd_console_time_to_seed.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():
    dt_input = input('Date and time (e.g. 1/30/2020 15:34:20): ')
    dt_input = dt_input.strip()
    dt = datetime.datetime.strptime(dt_input, '%m/%d/%Y %H:%M:%S')
    dt_string = f'{dt.month:02}/{dt.day:02}/{int(str(dt.year)[-2:]):02} {dt.hour:02}:{dt.minute:02}:{dt.second:02}'
    dt = dt + datetime.timedelta(seconds=1)
    xored_datetime = dt.month ^ dt.day  ^ int(hex(dt.year)[-2:], 16) ^ dt.hour ^ dt.minute ^ dt.second ^ 0b00010010
    print(f'Datetime (on selecting new game) -> Seed\n'
          f'{dt_string:32} -> {datetime_to_seed(xored_datetime):10} ({xored_datetime})')


if __name__ == '__main__':
    main()