My Mac is 15 months old and all of a sudden it has started resetting the time and date then I get a message saying not all apps will work because of the pre Jan date any help as to why ? Causing problems with wireless router.

My Mac book pro is 15 months old and now suddenly it has started resetting the date and time, causing problems with applications and my wireless access. Any suggestions as to why this is happening and how to fix it?

Seems the time isn't being saved to your computer correctly, it may be a corrupt file that isn't saving the time anymore.
You can move the
com.apple.systempreferences.plist
file out of your Users/Library/Preferences folder to the desktop and reboot.
then go to your System Preferences > Date and Time and set a time server close to your location (or in your time zone)
(trash the file on the desktop if no ill issues occur later on)
or you can follow/bookmark these support docs to reset your PRAM and SMC (and for future reference)
http://support.apple.com/kb/TS2570
http://support.apple.com/kb/TS1440
http://support.apple.com/kb/HT1455
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/HT1379
http://support.apple.com/kb/ht1379
http://support.apple.com/kb/HT1509
I don't remember exactly where OS X is keeping it time settings now, but I think one of those choices should help resolve your issue and won't hurt anything giving them a shot. Perhaps someone else could refresh my memory.

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