[5.4] Fix double timezone conversion in Media Manager file dates

[krishnagandhicode]

Pull Request resolves #29134

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

This PR fixes an issue where the Media Manager applies the user's timezone offset 2 times which results in incorrect "Date Created" and "Date Modified" times

In the local filesystem adapter, create_date_formatted and modified_date_formatted were generated using HTMLHelpr even though the date objects had already been adjusted to the configured timezone.
That caused the timezone conversion to be applied again in formatting, which produced shifted times confusion

The fix now formats the existing Date objects directly:
-create_date_formatted uses $createDate->format(Text::_('DATE_FORMAT_LC5'), true) and similarly for modified_date_formatted.

Testing Instructions

Go to System -> global Config -> under Server look for Location.
Change your Website Time Zone from UTC to a timezone with a some offset like for Asia/Kolkata (UTC+5:30), to make the bug visible.

now go to content -> media Upload an image and make sure to note your actual time.
now click on that i(info) button in top right and then click on the image you just uploaded - you get the details.

Actual result BEFORE applying this Pull Request

The "Date Created" time is shifted 2 times by the timezone offset . (e.g. as in my shared case if you set the timezone to UTC+5:30 now the timestamp will display exactly 11 hours ahead of UTC time instead of 5.5 hours).

In this SS as you can see that in my Windows Clock(bottom right) it UTC +5:30 : 16:30
and Joomla took the 11:00 UTC time, added the +5:30 offset once, and then added the +5:30 offset a second time, resulting in exactly 22:00)
as you see in the created Date : 22:00
I deliberately uploaded the file at exactly 16:30 IST(11:00 UTC, Kolkata) to make the math easy/clear : )

Expected result AFTER applying this Pull Request

The "Date Created" time reflects the time in whatever timezone is currently set in the Global Configuration - without any extra offsets

For my shared example: now it shows 16:30 (beacuse I uploaded it at 16:30 IST)

You can also test by uploading new images..

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[brianteeman]

great spot!!

[exlemor]

I have tested this item ✅ successfully on 0cde490

I was able to successfully test this! :) Thanks and great find @krishnagandhicode!

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[tecpromotion]

I have tested this item ✅ successfully on 0cde490

Very nice catch! Thanks!

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[tecpromotion]

RTC

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[muhme]

✅ Final test before merge with JBT

• Set Website Time Zone to Berlin (actual +2h), seen the error before
• Applied PR with Patch Tester, date & time are correct now

[muhme]

Thank you @krishnagandhicode for your contribution. Thank you @exlemor and @tecpromotion for testing.

[krishnagandhicode]

Thanks for the merge, and thanks to everyone who helped with Testing.