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Dictionary term

ISO Week Date

Direct answer

ISO Week Date: An ISO Week Date identifies a date by week-numbering year, week number, and weekday, with weeks beginning on Monday.

An ISO Week Date writes dates as a week-year, numbered week, and weekday.

Calendars & TimekeepingThe Great Almanac DictionaryUpdated 2026-07-16
Calendar and clock · visual guide ISO Week Date

An ISO Week Date writes dates as a week-year, numbered week, and weekday.

A cycle or timeline schematic for comparing the named timekeeping concept.

Quick reference

Use when
Use ISO Week Date for week-based schedules and datasets that follow the ISO rule for week 01.
Do not use it for
Do not assume the ISO week-year always equals the Gregorian calendar year printed beside the same day.
Reference category
Calendars & Timekeeping
Related terms
Revised Julian Calendar, Ordinal Date, Calendar, Julian Date

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The story behind ISO Week Date

International standardization formalized a Monday-based week in which week 01 contains the year first Thursday.

ISO Week Date in spiritual tradition

Spiritually, the ISO Week Date demonstrates how precise conventions reduce confusion in shared work.

ISO Week Date: fact and faith, kept distinct

This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.

ISO Week Date in numerology

ISO Week Date is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.

Why ISO Week Date matters

ISO Week Date supports unambiguous weekly reporting across month and year boundaries, especially in logistics and data systems.

ISO Week Date at work: an example

January 1 can belong to the final ISO week of the preceding week-numbering year.

Where interpretation stops

ISO Week Date is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.

Sources and editorial method

Research references used for this entry include:

Source
The Great Almanac Dictionary
Category
Calendars & Timekeeping
Also appears in
Calendars & Timekeeping
Aliases
None listed
Last updated
2026-07-16

Verify the week-numbering year

ISO Week Date in a book is one thing; ISO Week Date in your own birth chart is your life. The Oracle casts your real chart and tells you what it means for your love, your work, and your year ahead, in conversation, free.

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Revised Julian CalendarThe Revised Julian Calendar uses a refined leap rule adopted by some Eastern Orthodox churches. Ordinal DateAn Ordinal Date is a year plus its numbered day of year. CalendarA Calendar organizes days into named and numbered cycles for reckoning time. Julian DateJulian Date is a continuous astronomical count of days and day fractions. Coordinated Universal TimeCoordinated Universal Time is the international reference standard for world time. Sidereal TimeSidereal Time is star-based rotational time used to orient the sky.

More in Calendars & Timekeeping

Common questions

What is ISO Week Date?

An ISO Week Date identifies a date by week-numbering year, week number, and weekday, with weeks beginning on Monday.

How is ISO Week Date used in an almanac?

Use ISO Week Date for week-based schedules and datasets that follow the ISO rule for week 01.

What should I avoid when interpreting ISO Week Date?

Do not assume the ISO week-year always equals the Gregorian calendar year printed beside the same day.

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