index.js
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var parse = require('../parse/index.js')
/**
* @category Week Helpers
* @summary Return the start of a week for the given date.
*
* @description
* Return the start of a week for the given date.
* The result will be in the local timezone.
*
* @param {Date|String|Number} date - the original date
* @param {Object} [options] - the object with options
* @param {Number} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday)
* @returns {Date} the start of a week
*
* @example
* // The start of a week for 2 September 2014 11:55:00:
* var result = startOfWeek(new Date(2014, 8, 2, 11, 55, 0))
* //=> Sun Aug 31 2014 00:00:00
*
* @example
* // If the week starts on Monday, the start of the week for 2 September 2014 11:55:00:
* var result = startOfWeek(new Date(2014, 8, 2, 11, 55, 0), {weekStartsOn: 1})
* //=> Mon Sep 01 2014 00:00:00
*/
function startOfWeek (dirtyDate, dirtyOptions) {
var weekStartsOn = dirtyOptions ? (Number(dirtyOptions.weekStartsOn) || 0) : 0
var date = parse(dirtyDate)
var day = date.getDay()
var diff = (day < weekStartsOn ? 7 : 0) + day - weekStartsOn
date.setDate(date.getDate() - diff)
date.setHours(0, 0, 0, 0)
return date
}
module.exports = startOfWeek