Hi @maddog1, let me see if I can be of help here.
I can only speak for the Nordic market where I am based. Here we have a warranty period of two years from the date of purchase, so the easiest way to retrieve the warranty end date is to go by the date on your receipt.
But as this is an international support forum and service routines, warranty and consumer laws vary between markets, I suggest that you get in contact with your local support team to get a more specific answer to your question.
I hope that helped. Have a nice day! 
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