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Blog.page.tsx and BlogPostCard.tsx formatted post dates with new Date(post.date), which parses a date-only string such as 2026-09-15 as UTC midnight and shows September 14 to readers in US time zones. The home preview already avoided this through formatPostDate, so both components now use that helper, which gains a month-style argument for the long form the post page uses. Tests cover both forms on a date-only string. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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This was referenced Sep 17, 2026
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The research post page and the post cards formatted dates with
new Date(post.date). For the 85 posts whoseposts.jsondate is date-only (for example2026-09-15), that parses as UTC midnight, so readers in US time zones see the previous day (September 14 for a post dated September 15). The home-page preview already avoided this throughformatPostDateinblogPreviewUtils.ts, which appends noon to date-only strings.This routes
Blog.page.tsxandBlogPostCard.tsxthrough the same helper, which gains amonthargument (shortby default,longfor the post page), and adds tests for both forms on a date-only string. Verified the unit tests pass withTZ=America/New_YorkandTZ=Pacific/Honolulu; eslint and prettier clean on the changed files. Noticed while rendering #1208 locally: a post dated 2026-09-15 displayed as September 14.🤖 Generated with Claude Code