def current_datetime(engine):
# TODO (Python 3):
#def current_datetime(*, engine):
"""The current date and time on the database server
The result is a time zone aware :class:`datetime.datetime` in UTC.
:param engine:
A database interaction engine.
:type engine: :class:`sqlalchemy.engine.base.Engine`
:rtype: :class:`datetime.datetime`
"""
return _dt.datetime_from_unixtime(current_unixtime(engine=engine))