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@chce/weeknumber-iso8601

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Function to calculate the week number of a given date

github.com/chcederquist/weeknumber-iso8601

chcederquist/weeknumber-iso8601

2 lines (1 loc) • 186 B
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function e(t){var a=864e5,r=t.getFullYear(),n=new Date(r,0),o=(n.getDay()+6)%7,l=+t-(+n-o*a);return(o<4?1:0)+Math.floor(l/a/7)||e(new Date(r-1,11,31))}export{e as getWeekNumberISO8601};