You can get SPO site collection date by using below PowerShell script
Get-SPSite -Limit All | %{$root = $_.rootweb; $date
= $root.created.toShortDateString();
Write-Host "$($root.url) was created on $($date)"}
Fuente: https://www.c-sharpcorner.com/forums/how-to-get-spo-site-created-date
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