ISO 8601 Guide: Date and Time Format Standard for Developers
Use ISO 8601 date and time format correctly. Covers date, datetime, duration, interval notation, UTC offset, and JSON serialization best practices.
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Tags: developer-tools, timestamps, iso-8601
ISO 8601 Guide: Date and Time Format Standard for Developers ISO 8601 is the international standard for representing dates and times. If you have seen in an API response, that is ISO 8601. The standard covers date formats, time formats, combined datetimes, durations, intervals, and week dates. This guide is a practical reference for everything it defines and how to work with it in code. --- Why ISO 8601? The core problem it solves: date formats are ambiguous without an agreed standard. — is that April 5 or May 4? — which of the six possible interpretations is correct? — clear if you know the standard, opaque otherwise. ISO 8601 resolves ambiguity by using a big-endian format (largest unit first) with consistent separators. Once you know the format, parsing is unambiguous. Secondary…
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