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ISO 8601 Duration Builder Field Guide: When Four Parsing Rules Save Your API Contract
Four ISO 8601 parsing rules, five worked round-trip examples, and a pre-commit audit checklist for PnYnMnDTnHnMnS.
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ISO 8601 Duration Builder Field Guide: When PnYnMnDTnHnMnS Rules The Time Interval Grammar
A field guide to the ISO 8601 PnYnMnDTnHnMnS duration grammar, with the four edge cases that ruin most naive parsers and the four programming stacks that implement months four different ways.
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RFC 2822 Converter Field Guide: When Email Headers Beat ISO 8601
A field guide to RFC 2822 dates: how email, HTTP, and legacy archives parse them, what the four converter operations actually do, and how to audit output before shipping.
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The Five Forms of ISO 8601 You Will Actually Meet: A Field Guide to the Date Format That Is Actually Five Formats
The ISO 8601 standard is not one format — it is a family of five. Here is how to tell them apart, why the trailing Z matters, and what a real validator actually checks.