Thanks to ChatGPT:

    def _compute_in_range(self):
        for record in self:
            # Get user's timezone
            tz = self.env.user.tz or 'UTC'
            # Convert datetime_field to user's timezone
            dt = pytz.timezone(tz).localize(record.datetime_field)
            start = datetime.strptime("00:00", "%H:%M").time()
            end = datetime.strptime("07:30", "%H:%M").time()
            new_dt = add_time_range(dt)
            if new_dt.time() >= start and new_dt.time() <= end:
                record.in_range = True
            else:
                record.in_range = False