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ISO week date converter

Gregorian → ISO

ISO week date: —

ISO → Gregorian

Gregorian date: —

ISO 8601 — week format YYYY-Www-D. Week 1 contains the year's first Thursday; weeks start Monday.

About this tool

ISO week date converter is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.

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