14 lines
722 B
JavaScript
14 lines
722 B
JavaScript
|
import toDate from "../../toDate/index.js";
|
||
|
|
import startOfUTCISOWeek from "../startOfUTCISOWeek/index.js";
|
||
|
|
import startOfUTCISOWeekYear from "../startOfUTCISOWeekYear/index.js";
|
||
|
|
import requiredArgs from "../requiredArgs/index.js";
|
||
|
|
var MILLISECONDS_IN_WEEK = 604800000;
|
||
|
|
export default function getUTCISOWeek(dirtyDate) {
|
||
|
|
requiredArgs(1, arguments);
|
||
|
|
var date = toDate(dirtyDate);
|
||
|
|
var diff = startOfUTCISOWeek(date).getTime() - startOfUTCISOWeekYear(date).getTime(); // Round the number of days to the nearest integer
|
||
|
|
// because the number of milliseconds in a week is not constant
|
||
|
|
// (e.g. it's different in the week of the daylight saving time clock shift)
|
||
|
|
|
||
|
|
return Math.round(diff / MILLISECONDS_IN_WEEK) + 1;
|
||
|
|
}
|