From Valara:

"On Tuesday, October 16th at 4:00 AM PDT, all U.S. and European galaxies will be taken down for server maintenance and a live update.

When the update is complete, all galaxies will be live but unavailable while we complete final testing. All galaxies will be made available after that time.

4:00 AM PDT (Los Angeles) / 6:00 AM CDT (Austin) / 7:00 AM EDT (New York)
12:00 PM GMT (London) / 1:00 PM CET (Berlin) / 8:00 PM (Tokyo)
Click here for a Time Zone Calculator.

Mission Terminals:

• Fixed an issue with the daily mission counter not incrementing correctly."