Can your Arena Shard date be determined from your Ally Code?

Anrath

Hey I would like to figure out my Shard date, but I didn't use Game Center/Play Store when I started playing this game, so I can't use the first achievement date trick.

Can it be found somehow using an ally code?

Kyno

Nope. It's not sequential, it's random.

Just guess, or ask a shardmate.