Calendar in Nextcloud 12 - AM/PM versus 24-hour time

After upgrading to 12, when creating calendar events, I’m offered AM/PM times rather than 24-hour. Is there a way to change this? (Language is set to en_GB).

cc @georgehrke

I don’t know why en_GB was removed with Nextcloud 12 :confused:

But we will introduce a dedicated region setting in the future: