Account blockchain data
https://hivehub.dev/@epicenterdefacto

I did change the password for my Hive keychain

Keychain and your hive account are different things.

I'm gonna guess that the time is utc, but I could be wrong.
IF you go back to the date in the block explorer it should show you the transaction.
You may be able to filter for it, but you would just have to click on things to find out how.
I haven't done it.