EOL was originally slated for mid may.

Since Microsoft wants to ensure that customers benefit from the best support and servicing experience and to coordinate and simplify servicing across both Windows Server 2012 R2, Windows 8.1 RT and Windows 8.1, this update will be considered a new servicing/support baseline... beginning with the May Patch Tuesday, Windows 8.1 user's devices without the update installed will no longer receive security updates.
Information Regarding the Latest Update for Windows 8.1 - GLADIATOR@MSFT - Site Home - TechNet Blogs

This date has been extended to the 10th June.

While we believe the majority of people have received the update, we recognize that not all have. Having our customers running their devices with the latest updates is super important to us. And we’re committed to helping ensure their safety. As a result, we’ve decided to extend the requirement for our consumer customers to update their devices to the Windows 8.1 Update in order to receive security updates another 30 days to June 10th. As noted previously, consumer customers who do not update their Windows 8.1 devices to the Windows 8.1 Update by this new deadline will no longer receive updates. We’re confident that within the next month, the majority of the remaining customers who haven’t updated their devices to the Windows 8.1 Update will be able to do so.
Windows 8.1 Update Requirement Extended

After this date Microsoft is expecting you to have installed Windows 8.1 Update. You will not get security fixes and software updates otherwise.