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You can get the Pi to sync its time from whatever computer you are running from. But that computer needs to be set up as a NTP server.
So I have an Ubuntu box that connects to the Pi hotspot with a static IP address 10.42.0.100 and runs chrony as an NTP server
On the Pi (which is running Ubuntu server) I set the NTP server as 10.42.0.100 in timesyncd.conf
The config specifics will be dependent on which time sync service you are running on the Pi, and you may need to install some sort of NTP server on your other box. This should not be difficult
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