import time


def time_format(fmt='%Y-%m-%d %H:%M:%S', ts=None):
    return time.strftime(fmt, time.localtime(ts))


def time_make(datetime_format='', dt=''):
    return time.mktime(time.strptime(dt, datetime_format))

if __name__ == '__main__':
    # Example.
    print(time_format(fmt='%Y年%m月%d日 %H:%M:%S'))
    print(time_format(fmt='%Y年%m月%d日 %H:%M:%S', ts=1640012345))
    print(time_make('%Y-%m-%d %H:%M:%S', '2021-12-20 22:59:05'))