feat: add %V format code for ISO 8601 week number#128
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atoomic merged 1 commit intoApr 29, 2026
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Add format_V() implementing ISO 8601 week numbering (01-53), where week 1 contains the year's first Thursday and weeks start on Monday. Handles year-boundary edge cases: dates in early January that belong to the previous year's last week (52 or 53), and late December dates that belong to week 1 of the next year. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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atoomic
approved these changes
Apr 29, 2026
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What
Add
%V— ISO 8601 week number (01-53) — to the strftime/time2str format codes.Why
%Vis a standard POSIX strftime code that was missing from TimeDate. ISO week numbering is widely used in European business contexts, logistics, and project planning. Without it, users had to compute the ISO week number manually.How
New
format_V()inDate::Format::Genericusing the Thursday-based ISO 8601 algorithm. Handles the tricky year-boundary cases:Testing
t/iso-week-number.twith 18 test cases covering:🤖 Generated with Claude Code
Quality Report
Changes: 3 files changed, 75 insertions(+)
Code scan: clean
Tests: skipped
Branch hygiene: clean
Generated by Kōan post-mission quality pipeline