This Saturday, our engineers will be performing routine site maintenance from 10am to 2pm PST. You'll be unable to log in to your AdSense account during this time, but we'll continue serving ads to your pages and tracking your clicks, impressions, and earnings as usual. In addition, your ad targeting won't be affected.

We've converted the maintenance start time for a few cities around the world:

London - 6pm Saturday
Alexandria - 8pm Saturday
Hyderabad - 11:30pm Saturday
Jakarta - 1am Sunday
Perth - 2am Sunday

To learn more about what goes on during these maintenance periods, check out this Inside AdSense post.