[foxythefoxer]

Description

The site's sitemap lists 1,003 pages as last modified on 0001-01-01. For example, here's the entry for docker container run:

<url>
  <loc>https://docs.docker.com/reference/cli/docker/container/run/</loc>
  <lastmod>0001-01-01</lastmod>
  ...
</url>

Every affected page is generated rather than written in Markdown: the docker and sbx CLI references, and the Sandboxes, Hub, DVP, AI Governance, and Registry API references. Anything that reads the sitemap takes that date at face value, so these pages look like they never change.

The date is zero because these pages are built by Hugo content adapters, such as content/reference/cli/_content.gotmpl, so they have no file of their own in git. With enableGitInfo: true, Hugo takes Lastmod from the last commit that touched a page's file. With no file, and no date set by the adapter, Lastmod stays at Go's zero time, and layouts/sitemap.xml prints it as is.

This change skips <lastmod> when Lastmod is zero, which is what Hugo's embedded sitemap template does in v0.163.0, the version this repo pins. The element is optional in the sitemap protocol.

I tested this with a local production build (HUGO_ENV=production docker buildx bake release), before and after the change:

	Before	After
<url> entries	2,203	2,203
<lastmod>0001-01-01</lastmod>	1,003	0
<lastmod> with a real date	1,200	1,200

Before the change, my local build produced exactly the same sitemap as docs.docker.com, byte for byte, so the build is a faithful stand-in for the live site. Comparing the two builds, the only difference is that the 1,003 zero-date <lastmod> elements are gone. Every other entry is unchanged, including all 1,200 real dates. docker buildx bake validate passes.

Related issues or tickets

None.

Reviews

• Technical review

AI disclosure: Claude (Opus 5.5) helped with the diagnosis, the fix, this description and the tests. I reviewed everything before submitting.

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