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58 lines
1.9 KiB
TypeScript
58 lines
1.9 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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import { DAY } from "./constants.ts";
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/**
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* Returns the number of the day in the year in the local time zone.
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*
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* @param date Date to get the day of the year of.
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* @return Number of the day in the year in the local time zone.
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*
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* @example Basic usage
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* ```ts
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* import { dayOfYear } from "@std/datetime/day-of-year";
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* import { assertEquals } from "@std/assert";
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*
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* assertEquals(dayOfYear(new Date("2019-03-11T03:24:00")), 70);
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* ```
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*/
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export function dayOfYear(date: Date): number {
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// Values from 0 to 99 map to the years 1900 to 1999. All other values are the actual year. (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/Date)
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// Using setFullYear as a workaround
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const yearStart = new Date(date);
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yearStart.setFullYear(date.getFullYear(), 0, 0);
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const diff = (date.getTime() - date.getTimezoneOffset() * 60 * 1000) -
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(yearStart.getTime() - yearStart.getTimezoneOffset() * 60 * 1000);
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return Math.floor(diff / DAY);
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}
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/**
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* Returns the number of the day in the year in UTC time.
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*
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* @param date Date to get the day of the year of.
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* @return Number of the day in the year in UTC time.
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*
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* @example Usage
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* ```ts
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* import { dayOfYearUtc } from "@std/datetime/day-of-year";
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* import { assertEquals } from "@std/assert";
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*
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* assertEquals(dayOfYearUtc(new Date("2019-03-11T03:24:00.000Z")), 70);
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* ```
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*/
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export function dayOfYearUtc(date: Date): number {
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// Values from 0 to 99 map to the years 1900 to 1999. All other values are the actual year. (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/Date)
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// Using setUTCFullYear as a workaround
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const yearStart = new Date(date);
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yearStart.setUTCFullYear(date.getUTCFullYear(), 0, 0);
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const diff = date.getTime() - yearStart.getTime();
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return Math.floor(diff / DAY);
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}
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