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  3. ISO 8601 date

ISO 8601 date

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2026-01-05 is 2026-W02-1 in ISO week format.

Example

Format a date in ISO 8601 and see its ISO week notation.

2026-01-05 is 2026-W02-1 in ISO week format.

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Methodology

ISO 8601 uses YYYY-MM-DD and week notation YYYY-Www-D.

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