Question

1) The expiry date of the product will be 1 year from the date stated on the label, unless otherwise advised by the supplier.

OR

2) The expiry date of the product will be 1 year from the date stated on the label, unless advised otherwise by the supplier.

Which is correct?

Answer 1

Neither is correct. The word is "expiration" not "expiry."

If you're asking about the word order after the comma, it doesn't really matter.

Answer 2

Hmmm. I guess it's different in Canada: http://www.justice.gc.ca/eng/dept-min/pub/legis/n13.html

The word order still doesn't make any difference.