The heavenly messenger that spoke to
Daniel, gave a time limit for the Tribulation,
the judgments, and the cleansing of the
sanctuary.

To understand the messenger's information,
there is an event called "abomination of
desolation" which is when the Antichrist
desecrates the Jewish Temple in the middle
of the seven years.

Jesus said it starts the 'Great Tribulation'
which is the last 3 1/2 years of the Tribu-
lation Period (Matthew 24:15-22).