As a lunar month is about 29.531 days long, the full moon falls on either the 14th or 15th of the lunar month in those calendars that start the month on the new moon. In any event, the period between full moons can be either 29 or 30 days.
So every mid autumn festival (which falls on the 15th day of the chinese eight lunar month), the moon is always full.
This photo was taken two days before the mid autumn festival so the moon was almost full.
For other sky watchers, you can go to Skywatch blog.