def utc_now():
return datetime.datetime.now(UTC())<EOL>
Return a timezone aware datetime instance in UTC timezone

    This funciton is mainly for convenience. Compare:

        >>> from datetimeutil import utc_now
        >>> utc_now()
        datetime.datetime(2012, 1, 5, 16, 42, 13, 639834,
          tzinfo=<isodate.tzinfo.Utc object at 0x101475210>)

    Versus:

        >>> import datetime
        >>> from datetimeutil import UTC
        >>> datetime.datetime.now(UTC)
        datetime.datetime(2012, 1, 5, 16, 42, 13, 639834,
          tzinfo=<isodate.tzinfo.Utc object at 0x101475210>)