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Get the day of the year from a date

Written byPhuoc Nguyen
16 May, 2020
Last updated
13 Oct, 2021
Date Time
JavaScript version
// `date` is a Date object
const dayOfYear = (date) => Math.floor((date - new Date(date.getFullYear(), 0, 0)) / (1000 * 60 * 60 * 24));
TypeScript version
const dayOfYear = (date: Date): number =>
Math.floor((date.valueOf() - new Date(date.getFullYear(), 0, 0).valueOf()) / (1000 * 60 * 60 * 24));
dayOfYear(new Date(2020, 04, 16)); // 137
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