Shadow of the Tomb Raider in September?

Shadow of the Tomb Raider is apparently coming in September. The Tomb Raider Website has a caption that says MARCH 15TH, 2018 6:00 A M P D T, presumably a tease of an announcement (which thankfully dispenses with a countdown timer to challenge our math skills). It seems we won't have to wait until tomorrow to learn the significance of this, though, as Kotaku snooped through the HTML and found a release date listing. They say the site's source code includes the following tidbit: ""Shadow of The Tomb Raider is the climatic finale of Lara’s origin story. Available September 14th 2018."