Season 27 in Diablo 3 is coming to an end on February 19 at 5:00 PM PST.

Blizzard will reveal the Season 28 start date in an upcoming Season preview blog post.

(Source)

Hello all –

Season 27 is coming to a close. Below are the times when Season 27 will end for each region.

North America – February 19 at 5pm PST
Europe – February 19 5pm CET
Asia – February 19 at 5pm KST

We will be providing a Season 28 preview soon which will include the start time for the next season. Stay Tuned!