ISO week date
leap week calendar system in which weeks start on a Monday and the first week of a year starts from the Monday closest to 1 January; e.g. Thu. 31 Dec. 2009 is 2009–W53–4
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ISO week date
Summary
ISO week date is a norm[1]. It ranks in the top 5% of norm entities by monthly Wikipedia readership (959 views/month).[2]
Key Facts
- ISO week date's instance of is recorded as norm[3].
- ISO week date's subclass of is recorded as leap week calendar[4].
- ISO week date's part of is recorded as calendar year[5].
- ISO week date's described by source is recorded as NEN 2772[6].
- ISO week date's defining formula is recorded as \begin{aligned}\text{week}(\text{date}) &= \left\lfloor \frac{\text{ordinal}(\text{date}) - \text{weekday}(\text{date}) + 10}{7} \right\rfloor \\text{week} &= \begin{cases} \text{lastWeek}(\text{year}-1), & \text{week}<1 \ 1, & \text{week}>\text{lastWeek}(\text{year})\end{cases}\end{aligned}[7].
- ISO week date's Google Knowledge Graph ID is recorded as /g/1221mvqn[8].
- ISO week date's maintained by WikiProject is recorded as WikiProject Mathematics[9].
- ISO week date's in defining formula is recorded as date[10].
Why It Matters
ISO week date ranks in the top 5% of norm entities by monthly Wikipedia readership (959 views/month).[2] It has Wikipedia articles in 8 language editions, a strong signal of global cultural recognition.[11] It is known by 10 alternative names across languages and contexts.[12]