Note: This blog post is from 2020. Some content may be outdated--though not necessarily. Same with links and subsequent comments from myself or others. Corrections are welcome, in the comments. And I may revise the content as necessary.

It turns out that with the release of CF2021, Adobe introduced a breaking change...if you use any of the CF tags or functions that use date formatting masks. The problem is that while a capital "D" value used in such mask used to simply mean the same as a lower-case "d" ("day of month"), the change in CF2021 is that "D" now means instead "day of YEAR"! That can be a devastating problem that might lurk for days or weeks, corrupting your data.

TLDR; You have two solutions:

• you can choose either find and change the affected code (not easy but using techniques shared below)
• or you can implement a new JVM arg that Adobe offers to revert this behavior back to how things worked before CF2021 (discussed below), which still applies in CF2023 and beyond

If you're affected, you must do one or the other of these things. For more, read on.

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Note: This blog post is from 2020. Some content may be outdated--though not necessarily. Same with links and subsequent comments from myself or others. Corrections are welcome, in the comments. And I may revise the content as necessary.

The recent release of CF2021 is a great sign for the continued vitality of CF, but this looming deadline is a reminder that as the years roll on, we not only get new versions but we say good-bye to old ones.

Wondering what you can do? or when CF2018 or CF2021 support ends? And what's the difference between "core" and paid Adobe support plans? For more on these, as well as official Adobe documentation that discusses such things, read on.

[Update: CF2016 users got a "reprieve" of sorts, when Adobe released updates to CF2021 and 2018 in March 2021, and they also offered the final update to CF2016, update 17, especially because it address a security vulnerability. Sadly, some of the changes in the update--not related to the security fix--were "breaking" changes. For more on that update, see the Adobe blog post from March 2021.)

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