import datetime


def unix_epoch_time_to_datetime_utc(ts_sec: int) -> datetime.datetime:
    return datetime.datetime.utcfromtimestamp(ts_sec) \
        .replace(tzinfo=datetime.timezone.utc)

def datetime_utc_now() -> datetime.datetime:
    return datetime.datetime.utcnow().replace(tzinfo=datetime.timezone.utc)