I'm Jira cloud Site admin, I wna to know Jira cloud instance inception date
What question would that answer for you? I can't think of a use for it beyond wanting to know a bit of history.
You should be able to work it out for a paid plan, by going back over the invoices for it (but bear in mind it was probably created as a trial, and the invoicing only started a short while after the actual creation)
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