Calendars and time
Week Number
Direct answer
Week Number: A Week Number is the ordinal assigned to a week within a defined week-numbering system.
A Week Number labels a week according to a stated calendar convention.
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At a glance
- Found in
- Calendars & Timekeeping
- Related
- Ordinal Date, Intercalation, Calendar, Julian Date
A Week Number labels a week according to a stated calendar convention.
A cycle or timeline schematic for comparing the named timekeeping concept.
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The story behind Week Number
Numbered workweeks expanded with industrial scheduling, international trade, and computerized planning.
Why Week Number matters
Week Number matters because systems disagree about the first weekday and which partial week begins a new week-year.
Week Number in practice: an example
The same early-January dates can be called week 1 in one system and week 52 or 53 in ISO notation.
Where readings of Week Number go wrong
A common error is to exchange week numbers across software or countries without confirming their week rules.
Sources and editorial method
Research references used for this entry include:
- ISO: ISO 8601 Date and Time Format - Standards-body overview of unambiguous international date and time representations.
- NIST: Local Time Frequently Asked Questions - Official reference for time zones, offsets, daylight-saving rules, and civil time.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Last updated
- 2026-09-26
State the week convention
A definition tells you what it is; your own birth chart tells you what it means for you. The Oracle casts your real chart and answers for your love, your work, and your year ahead, in conversation. It opens with the 7-day Seeker trial.
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More in Calendars & Timekeeping
- Barycentric Dynamical Time
- Common Era
- Dynamical Time
- Greenwich Mean Time
- Julian Century
- Lunisolar Calendar
- Reduced Julian Date
- Synodic Month
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Common questions
What is a Week Number?
A Week Number is the ordinal assigned to a week within a defined week-numbering system.
What do people get wrong about a Week Number?
A common error is to exchange week numbers across software or countries without confirming their week rules.
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