[Qt] Update 5.15 LTS commercial licence holder EOL

[hugovk]

Official support for Qt 5.15 LTS [1]:

"For our open source users, it will be supported in the same way as other regular Qt releases until the release of Qt 6."

-> 2020-12-08 [2]

"For commercial customers, Qt 5.15 will be long-term-supported (LTS) for three years with regular bug fix releases beyond the release of Qt 6. "

-> 2020-12-08 + 3 years = 2023-12-08

[1] https://www.qt.io/blog/qt-5.15-released
[2] https://www.qt.io/blog/qt-6.0-released

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There was discussion in #282 about whether to show the commercial licence holder EOL for 5.15, or the earlier open-source one.

Because KDE is releasing the patches as open-source it was decided to show the commercial LTS for open source too.

(This does cause some confusion about EOLs for the Python bindings, PySide2 and PyQt5, but let's not go into that now ;)

So assuming we're sticking with commercial licence holder EOL == open-source EOL, the support info from https://www.qt.io/blog/qt-5.15-released suggests the Qt 5.15 EOL is really:

• Qt 6 release date + 3 years

And not:

• Qt 5.15 release date + 3 years

[BiNZGi]

Seems okay from my side. @usta what do you think?

[usta]

New plans :
https://www.qt.io/blog/qt-5.15-extended-support-for-subscription-license-holders

[usta]

adding this as release image : https://www.qt.io/hs-fs/hubfs/subscription%20timeline.png?width=1370&name=subscription%20timeline.png

[hugovk]

Aha, thanks for that!

Legacy license holders are operating under standard LTS rules. Thus EoS for Qt 5.15 LTS is 26th May 2023.

So this PR is wrong, it should be the current 2023-05-26 and not 2023-12-08.

If you need technical support for Qt 5.15 beyond 26th May 2023, you can either subscribe to Qt 5.15 Extended Support for your project or convert your legacy licenses to Subscriptions.

So you need a new licence for support up to 2025-05-26.

Okay, so we have three EOL dates:

• 2020-12-08 for open source users
• 2023-05-26 for legacy licence holders
• 2025-05-26 for new licence holders

But we have assumed open source users can still get patches via KDE. Do we assume they can still get patches up until 2025-05-26?

I'll close this PR, and recommend another to update if needed. It should have some descriptive text to help explain these different levels of EOL :)

[usta]

@hugovk could you prepare a new pr just to update releaseimage which shows that photo which i mentioned above ? Thank you
About KDE i dont think they will continue to support it until 2025 but until the end of support of kde plasma 5
we are still on developing the qt6+qt5 ( both ) supported KDE frameworks then kde plasma 6 will be based on it , and looks like it wont will be begining of next year it will be possoble but you know sometimes new devs contribute more and it might be much earlier :)

[usta]

@hugovk also if it is ok for you could you add these discustions to talk part of Qt (in endoflife's talk wiki ) so new contributers might follow easily

[hugovk]

@usta Yes, see please see:

• [Qt] Add release image #1107
• https://deploy-preview-1107--endoflife-date.netlify.app/qt
• https://github.com/endoflife-date/talk/wiki/qt