Bonus points for sending the Unix timestamps in millis ... I hope the lawyer who got this response has to hire a consultant too translate it for the court!
> The only information Signal maintains that is encompassed by thesubpoena for any particular user account, identified through a phone number, is the time of account creation and the date of the account’s last connection to Signal servers. That is all. [2]
I am a bit skeptical about the precision due to the last 3 zeros for the 'last connection date'. It seems to unlikely that it got exactly that moment...