How to Check your Mac AppleCare Warranty
We don’t want it to happen, but there comes a day in all Mac owners lives that their warranty expires, and that date is related to your original date of purchase, give or take the time for any additional AppleCare warranty service you have purchased in addition. So how do you check your Macs warranty information online? Follow these steps:
1) Open “System Profiler” and towards the bottom of the first ‘hardware’ screen is your systems Serial Number
2) Copy the Serial Number and visit the Apple Warranty Service site: https://selfsolve.apple.com/GetWarranty.do
3) Enter the serial number and your country, and search. Your Apple Warranty Information will be returned to you!

Thanks for the tip, this also works for other apple products not just macs. So you can check your iPod and iPhone warranties too as long as you have the serial numbers.
Talk about timing. Mine expires Monday!
Credit you for details. It helped me in my assignment