(Q2110154)

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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

week date
week number
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{\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}}

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in defining formula

date

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WikiProject Mathematics

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28 October 2013

(Q2110154)

ISO week date

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