Issue with Non-Gregorian Dates in Sitemap Causing Errors in Google Search Console

[hamid-reza67]

Hi everyone. There is a problem with the sitemap. When a non-Gregorian calendar is used (such as the Jalali or Hijri calendar), the lastmod date in the sitemap is also set to the non-Gregorian calendar, which causes an error in Google Search Console. Apparently, Google considers non-Gregorian dates to be invalid for sitemaps.

[github-actions]

Thank you for submitting your first issue, awesome! 🚀 We're thrilled to receive your input. If you haven't completed the template yet, please take a moment to do so. This ensures that we fully understand your feature request or bug report. A core team member will review your issue and get back to you.

[Piedone]

Please provide reproduction steps.

[hamid-reza67]

1. Change the culture to one that uses a non-Gregorian calendar (I changed it to fa-IR (Persian)).
2. Republish one of the articles that is present in the sitemap.
3. Now, check the details of that article in the sitemap.
   You will see that the lastmod field has a Jalali (non-Gregorian) date.

[Piedone]

Thanks! So, it seems when generating the lastmod we need to force a specific format regardless of the culture, W3C Datetime format, see the docs.

Is this something you'd venture into contributing?

[github-actions]

We triaged this issue and set the milestone according to the priority we think is appropriate (see the docs on how we triage and prioritize issues).

This indicates when the core team may start working on it. However, if you'd like to contribute, we'd warmly welcome you to do that anytime. See our guide on contributions here.

[gvkries]

This does not occur on the main branch anymore. There have been several related fixes, e.g. recently #15229.

[Piedone]

Oh, great!