import pytz
from datetime import datetime


def utc_(moment_time, tz):
    """
    Converts unix time to datetime.datetime.

    :param moment_time: unix time; may be format: int, float
    :param tz: timezone; format: str("Region/City")
    :return: datetime.datetime + utc
    """
    local_tz = pytz.timezone(tz)
    dt = local_tz.localize(datetime.utcfromtimestamp(moment_time))
    dt = dt.astimezone(pytz.timezone(tz))
    return dt