There is more and more evidence that the Apple iPhone 5S release date will be September 20. A document has leaked which shows that AppleCare employees will have limited vacation time during the period from September 15 to September 28.

According to AppleInsider, a calendar for AppleCare employees was released which shows that Apple employees won't be able to take much time off surrounding the supposed release date of September 20. That day is believed to be the day that Apple will release the new iPhone 5S and the cheaper version of the iPhone, the iPhone 5C. iOS 7 is also expected to drop that week as it is believed that both of these devices will run on that system.

AppleInsider says "An internal company document shared with AppleInsider purportedly shows time off available for AppleCare employees for the latter half of September. As can be seen in the calendar, available time off drops off significantly starting Sunday, Sept. 15, and continues through Saturday, Sept. 28.

The image provided shows the calendar being accessed via virtual private network from an internal Apple employee domain. Potentially identifying portions of the picture have been cropped out."

For a photo of the calendar, click here.

The slated limited vacation period shows that Apple employees will have a lot to prepare for and their hands may be full for a week after the release.

Apple is expected to reveal the new products on September 10. The new high-end iPhone 5S is expected to have a fingerprint sensor under the home button and the affordable iPhone 5C will have a plastic back that will come in a range of different colors. This is expected to be the first time Apple releases two new iPhones at the same time.

There are many rumors going around about the new iPhone. Some say the new phone will be available in gold in addition to the traditional black and white. It will also have a faster processor, longer battery life, and an improved camera, which are common upgrades for new products.