HP Photosmart All In One printer, scanner (6510, B211a) can be a life saver. Sometimes I wonder where the smarts went to . If you scan a document to SD card, you will get a document with a weird date in the year 2008. There is no facility to set the date either on the control panel or web page! A quick search through the various HP printer forums, a few people were having the same problem. This feature seems to be little use or people just put up with it.
One day I was browsing through my router’s config when I realized that the NTP was disabled. Turning that on the date problem corrected itself. Hah! So much for good documentation.