Found a timeline page for ff7 and the end of CC and the start of FF7 is only days inbetween.
Game Start
Cloud and AVALANCHE blow up a Mako reactor in Midgar.
Hours before
Cloud meets Tifa at the Sector Seven trainstation. Cloud begins to form his own illusory world by Jenova's power.
Days before
Cloud and Zack arrive in Midgar--Zack is killed by Shinra and Cloud is left for dead.
One week before
Zack and Cloud escape the Shinra Mansion in Nibelheim.
Four years before
Corel is burned by the Shinra. Barret and Dyne both loose one hand. Barret's wife dies in the fire. Marlene adopted by Barret.
Five years before
Marlene born. Shinra uses SOLDIER to put down resistance. Tifa meets Zack (?) Nibelheim burned by Sephiroth after he finds Jenova. Tifa's father murdered by Sephiroth. Sephiroth dies, taking Jenova's head with him. Hojo begins his experiments on the remaining Nibelheim populace, includidng Zack and Cloud.
Six years before
War between Shinra and Wutai ends. Space program ended when Shin-Ra discovers how profitable Mako is. First Mako reactor built in Nibelheim.