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jacksteamdev/day-number.js

Last active September 27, 2019 21:57
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Calculate numbered day of year
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day-number.js
function dayNo(y,m,d){
return --m>=0 && m<12 && d>0 && d<29+(
4*(y=y&3||!(y%25)&&y&15?0:1)+15662003>>m*2&3
) && m*31-(m>1?(1054267675>>m*3-6&7)-y:0)+d;
}
Date.prototype.dayNo = function(){ var y=this.getFullYear(), m=this.getMonth(); return m*31-(m>1?(1054267675>>m*3-6&7)-(y&3||!(y%25)&&y&15?0:1):0)+this.getDate(); };
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https://stackoverflow.com/a/27790471/4842857

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