Question

How to get the day of the year from date in JavaScript

Answer 1

function getDayOfYear(date = new Date()) {
  const dateMilliseconds = Date.UTC(
    	date.getFullYear(),
    	date.getMonth(),
    	date.getDate(),
  );
  
  const YearMilliseconds = Date.UTC(date.getFullYear(), 0, 0);

  const days = (dateMilliseconds - YearMilliseconds) / 1000 / 60 / 60 / 24;

  return days;
}


console.log(getDayOfYear(new Date('2022-01-5'))); 
console.log(getDayOfYear(new Date('2022-02-3'))); 
console.log(getDayOfYear(new Date('2022-12-31'))); 

  
  
  
  
/*
run:
  
5
34
365
  
*/

 

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