While working on T259818 I realized that the PHP version of our code for parsing dates doesn't work correctly when the language uses different digits than 0-9. Only the JS version works correctly.
As a result, when the new reply API is deployed, it will no longer be possible to reply to anything using DiscussionTools on those wikis.
Among the wikis where DiscussionTools are available, only ckb.wp is affected, and it does not have a beta cluster wiki, so we haven't noticed this in testing. (ar.wp is not affected, because the digit transform is disabled there.)
The issue can be reproduced on beta fa.wp though: https://fa.wikipedia.beta.wmflabs.org/wiki/بحث:صفحهٔ_اصلی?dtenable=1
- This patch should be deployed in conjunction with T252558 during one of 2-September's backport windows [i]