If you look on the bottom of bottle, it looks to me that the "P" would be the date it was produced, and the "E" would be the expiration date.

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Q: Does the green tea provide any caffeine? I want these for late night "snack" and don't want any caffeine.

This is a breath mint and I don't think it is considered a snack food. I think the green tea is only for the flavor (but I can't even taste green tea), even if it has caffeine, I don't think it would be of significance as each mint is 0.7g or 0.025 oz.