World rankings cut-off

What is the cut-off date for the World’s Skills Rankings? What I mean is when do the rankings stop updating to get the top 50 that get an invite to World’s.

RobotEvents World Skills
At the top of that page:
2017-02-27: Qualification for Regional/State Championship
2017-03-13: Qualification for VEX Worlds Top 50
2017-03-13: Season Standings Finalized

Ahhh… gotcha… been a long day!