Activision Publishing, Inc., also known as Activision, is an American video game publisher. It was founded on October 1, 1979 and was the world's first independent developer and distributor of video games for gaming consoles. Its first products were cartridges for the Atari 2600 video console system published from July 1980 for the US market and from August 1981 for the international market (UK).
The Atari 2600 was developed in January 1980.
It's never mentioned when it was created, January 1980 seems plausible if games were being released in July 1980, but we simply don't know for sure. It's difficult because other dates are mentioned in the text which probably confused the system.
( z1 develop :ARG1 ( z2 product :name ( z3 name :op "Atari" :op "2600" ) ) :time ( z4 date-entity :month 1 :year 1980 ) )