Sony has announced that the PlayStation Network will be undergoing scheduled maintenance on Wednesday, 25th May 2016 for approximately 2 hours. For those in the UK and Europe, the maintenance window will be begin at 5:30am BST, and end at 7:30am BST.
For North Americans, that translates to 9:30pm to 11:30pm Pacific time on Tuesday, 25th May 2016. The announcement was made via Twitter (see below) but is also reflected on the PSN Status Page.
Routine PSN maintenance Tuesday 5/24, 9:30pm-11:30pm Pacific time. More info: https://t.co/NJX2xGM3Rk
— Ask PlayStation (@AskPlayStation) May 18, 2016