Maintainence notice active but unclear

Hi folks, I am still getting this message and it’s unclear which Thursday it refered to

Migration Notice

The forum will be read-only from 10:00 BST Thursday for a server migration.

and what is BST IN UTC?

although I found the date in the details

British Summer Time (BST) is 1 hour ahead of UTC. To convert BST to UTC, subtract one hour from the BST time.

Never could get the hang of Thursdays.

Can it please be noted that Summer in BST is purely based on the season according to the calender and bares no indication of or resemblance to actual weather conditions.