My iphone 3g calendar isn't working properly

So i have had this old Iphone for ages now, and whenever i go onto the app store and try and buy something, it says sorry your date in not available or something because i on my calendar it says its something like 1683 BE and i don't no how to change this? I tried clicking back a month back a month back a month but it won't change. Do you no how i can change it? Its years old but still, and i have recently found it since i got a blackberry in the mean time, and i want to buy some more apps and be able to use it again.

Go into Settings > General > Date & Time

Make sure it is slided onto 'Set Automatically' ON.

The phone picks up its date settings from the internet (mobile web), is your mobile internet (3G) working correctly? If it is, but the date is still showing incorrectly then this will be a software issue on the phone.

Perform a hard reboot on an iPhone by holding down the home button and the top 'lock' button at the same time for about 20 seconds until you see an Apple logo on the screen, then release the buttons.
This reboots the phones software without deleting any data or settings and helps to clear any temporary software glitches.

Go into Settings > General > Software Update (or plug the phone into iTunes) to check you have the latest version of software.

If all this fails then you need the phone looked at by Apple. You can send it away or take it to an Apple store (you need to make an appointment by calling your nearest one or booking it online on the Apple website)

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