Workouts disappear from ICS feed before day is over

I subscribe to my calendar ics feed with the Apple Calendar app. Everything seems to work fine, I can see my upcoming workouts.

The problem is a workout for the current day will disappear before the day has ended.

For example this morning I saw a workout, by evening time it was gone!

If I look at my raw ics feed I can see it is not there. I suspect the events drop out of the feed at the end of day UTC time while I am in US Mountain time, which means they drop out at 5pm.

Can I set my timezone somewhere that will dictate when they leave the feed?

Sorry responding slow. My developer will look at this, maybe a time zone issue.

No worries. Definitely not an urgent matter