Dates changed on the photos Photos were taken in 2011 on Samsung phone GT-B3310 (not a smartphone). This phone was switched off for over 2 years in 2013. 


On 24 January 2015 the phone was switched on and transferred the pictures via Bluetooth onto my Samsung Galaxy S3. The pictures showed dates from 24 to 28 January 2015. Some pictures had 24, some 26, 27 and 28. The Exif file also showed the dates from 24 to 28 January 2015. The original dates in 2011 were missing.
Samsung South Korea said that if a device is switched off for long, and subsequently switched on and connected to a device (phone/computer) the pictures would take the switch off date. 
But the puzzle is, why do dates vary from 24 to 28 January 2015? Can anyone kindly give answer? This has created a huge issue/problem for me.
Exif dates are stored in your images as strings, including the year. So the fact that the phone was off shouldn't be relevant.

However it's quite common that image transfer programs re-write metadata, unfortunately.

Try emailing yourself one of the images from the phone directly and testing with that on another computer (or find some other way to get a file off the phone for testing.)

Switching the phone off won't wipe any Exif data. That's stored inside the files.