Thanks for the quick reply and additional guidance. At this point, I’m going to monitor and wait a day or two in order to re-confirm this new problem before raising a new ‘Topic’. After reading your reply, I double checked the "Last checked on [date/time]" this morning and it is now correct and accurately reflects today's date and time.
Looking ahead, I’ll monitor the ‘Update & Recovery – Check for Update’ function and will raise a new ‘Topic’ if I observe the problem again. I will also try to capture as many details as I can prior to raising a new ‘Topic’. Thank you.

The recent upgrade to Opera Version 75.0.3969.149 on my workstation has apparently resolved the "History Date' issue' under this release. Many thanks to the Opera Support team for remediating the problem.

Separately (and ironically) while running the 'Update & Recovery' function from the Opera Menu to confirm the release level, the "Last checked on [date/time]" is now incorrect and displays the date and time exactly one day ahead. Not overly concerned from an end-user perspective, but perhaps something the Opera Support team may want to review/validate for consistency purposes.

Happy to formally raise the "Opera Version - Last checked on date" issue if required, just let me know the best approach. Thanks.

FYI, I have been have other issues with the latest version of Opera (....149). It would start on my W7 machines but not load any web pages. Errors seemed to indicate that there is a problem with the "operaautoupdate.exe" file and the "launch.exe" file for the latest version. I downgraded to version 70......232. Trick is to turn off Opera immediately after the installation is complete, delete the autoupdate file from recent installation, or else it will upgrade to version ...149. Hope you are not having this problem, but I am. Will comfortably stay with version ....232 until they get this resolved.

Update:

Just confirmed, the issue is with negative timezones. With UTC, UTC+1, etc. everything works fine. I can even select from today to today in the filter. With UTC-1 all issues are back. Selecting "To March 1st", when you reopen the filter popup "Feb 27th" is selected.

I then moved the computer's date one day forward, the filter lets me select March 2nd, but when I do, March 1st is selected. After clicking on Done, the results belong to March 1st. If I open the filter again, no date appears selected, so I go back to February and I see the 28 is selected on both calendars. However, the dates on top still say "From: 2021-03-02 To: 2021-03-02" but however they still filter from and to March 1st.

It's weird, like if the timezone bug is occurring twice: once when selecting the date, and again when showing the (supposedly) selected dates when you re-open the date filter, so you actually get a 2 day difference overall. That's also why I was getting February 27th in my previous test.

I just tried the latest dev version (76.0.3989.0), and it still has the date range issue I explained here. The history itself, without filtering, looks good. Keep in mind my explanation above was written on March 2nd.

@alobpreis The issue with the day on history changing at UTC instead of in local time zone was fixed a while ago and everything seems to be working fine here.

Indeed, I'm aware and commented about that some months ago. I was just guessing that maybe the timezone problem is still present in the date filter and is causing this 1 day off issue.

Update:

Just confirmed, the issue is with negative timezones. With UTC, UTC+1, etc. everything works fine. I can even select from today to today in the filter. With UTC-1 all issues are back. Selecting "To March 1st", when you reopen the filter popup "Feb 27th" is selected.

I then moved the computer's date one day forward, the filter lets me select March 2nd, but when I do, March 1st is selected. After clicking on Done, the results belong to March 1st. If I open the filter again, no date appears selected, so I go back to February and I see the 28 is selected on both calendars. However, the dates on top still say "From: 2021-03-02 To: 2021-03-02" but however they still filter from and to March 1st.

It's weird, like if the timezone bug is occurring twice: once when selecting the date, and again when showing the (supposedly) selected dates when you re-open the date filter, so you actually get a 2 day difference overall. That's also why I was getting February 27th in my previous test.

But there's still an issue with the date range. By default the date pickers show you today, but it seems the timezone bug is still there, as today is greyed out. As I'm in UTC -3 (the day change in history used to happen at 9pm), I think this happens because the calendar enables up to 9pm from the previous day.

If I go to Februrary and pick from 24th to 26th, it selects 23rd to 25th in the calendar (the dates are right at the top though).

I will also need some days to further test this, as I cannot select March 1st to test the date range filtering.