Matthew 24:21 (KJV)

For then shall be great tribulation, such as was not since the beginning of the world (kosmos) to this time, no, nor ever shall be.

In my opinion I  think I would put Noah’s flood as more tribulation, (killed just about everybody) which might put this after Noah’s flood. This is consistent with this ‘kosmos’ starting with The Abrahamic Covenant as described on this site.