Working With UNIX dates in Repeating Groups

[agencipattern]

Hey everyone, I’m struggling here…

I’m making an API call that receives UNIX timestamps for events (economic calendar). I get around 150 events from the same week in UTC0.
I’ve managed to group the events by day using custom states, date formatting. I´m using one repeating group for each day (see the attached picture for reference).

The problem is that when the user changes the timezone (using a dropdown menu), all the events are updated, and some of them might shift to different days. I’m having trouble re-grouping the events correctly because I don’t know the exact day/time of the first event (I can’t simply add days), and I can’t use unique values since each event has a different hour and minute, even if it’s on the same day.