When did I get pinged?

[pingittypong]

If I got a notification on the app on Monday morning saying I needed to isolate for 9 days, then when did I get pinged as being in contact with someone?
Saturday or Sunday?
I'm allowed out of isolation midnight next Tuesday.
If it was Sunday then I'm slightly confused, as the only place I went was to the supermarket with my mum for 20 minutes. We were next to each other the whole time, and her app hasn't pinged.
If it was Saturday this is more believable, as I went for lunch at the pub. Although the 3 people I was with didn't get notifications.

There's a bit on the app that tells you the contact date

It’ll be the Saturday which will be day zero and then isolate ten days following that. If you go in the app and go in settings then other data it will show your encounter date.

Go into settings- other data, and your contact date is in there.

But as PP said if it was 9 days on Monday then contact was Saturday.

In settings mine just lets me change the language.

Just updated the app and now it shows. Yep Saturday.

As said above contact day is day zero, and it's the following ten days. DD knows exactly who she'd been in contact with and when (she had contact with three positives on the same day, but didn't get covid by the way).