events and activities not showing on correct day

Exactly as I’ve found re; clocks changing. 

I also wonder if the fact it’s a leap year has something to do with it? 

I've had a reply from them on Twitter -

"Thank you for reaching out! We have a ticket open for this and our engineering team is working on a fix. If you'd like to be notified when the fix is released, we can add you to that ticket. If you are interested in that, please let us know the email address associated with your account." 

• I am facing exactly the same issue!  I was in the States last few days and now since I have been back my calendar is showing entries one day earlier even though when you click on the activity the date and time is correct.

Same for me. I thought I was going mad. I’ve followed all the advice , time zone (it was correct to start with ) delete app, reinstall. I ran this morning, on daily activity it’s showing as yesterdays activity , and yesterdays 2 x workouts showing the day before that. Only the on the Garmin Connect mobile app calendar  , calendar desktop site is fine? I also noticed this started after British Summertime ended but also noticed there was an app update 2 days ago ?!  Please sort this out Garmin.   

My activities are being shown a day behind themselves. 
If I go for a run for example the date stamp is correct so it would show today’s date, but it will populate under yesterday’s activities on the Garmin connect calendar. So essentially my activities are always a day behind, but the date stamp is correct so editing and changing the time and date doesn’t help. 

This is happening for me as well. Just got back from a run, it’s showing in the calendar view as today but click on it and nothing shows, but go back to yesterday (when I actually had a lie-in instead) and there it is…

Messed about with a few things last night but no change, run this morning - same story calendar defaults to previous day even though the run details are correct - so annoying!  I will try their helpdesk tomorrow, I don’t think they do live chat….

Activities showing in calendar one day behind when I did them. Please advise Garmin.