Question

That way at the chat we could say like its our _ month/year anniversary on the site.

Comments

You can check your e-mail for the confirmation/welcome e-mail for the date!
The e-mail will be dated when it was sent (when you signed up).

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Plus, you couls subtract the amout of time in your profile. Easier if you have been here for more than a month, as you have been for almoast/over a year (even easier :D)

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But that "x months ago" isn't an exact date!

Answer 1

It does say in your profile how long you've been here, although not a specific date.

Maybe I'll add that somewhere but it's not that important IMO.