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. Date Formats Calendar Date Year, Month, Day: : 4-digit year. Use a 4-digit year. Always. is ambiguous between 1924 and 2024. : 2-digit month, zero-padded (–) : 2-digit day, zero-padded (–) Week Date ISO 8601 also defines a week-based calendar: ISO weeks start on Monday (day 1) and end on Sunday (day 7). Week 1 is the week containing the first Thursday of the year. Ordinal Date Less common in APIs, but…
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