We've converted the maintenance start time for a few cities around the world:
London - 10am GMT Sunday
Alexandria - 12pm EET Sunday
Hyderabad - 3:30pm IST Sunday
Jakarta - 5pm WIT Sunday
Perth - 6pm WST Sunday
To learn more about what goes on during these maintenance periods, check out this Inside AdSense post.
Posted by Katrina Kurnit - Inside AdSenseTeam