41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
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var parse = require('../parse/index.js')
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var addDays = require('../add_days/index.js')
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/**
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* @category Weekday Helpers
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* @summary Set the day of the week to the given date.
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*
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* @description
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* Set the day of the week to the given date.
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*
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* @param {Date|String|Number} date - the date to be changed
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* @param {Number} day - the day of the week of the new date
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* @param {Object} [options] - the object with options
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* @param {Number} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday)
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* @returns {Date} the new date with the day of the week setted
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*
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* @example
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* // Set Sunday to 1 September 2014:
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* var result = setDay(new Date(2014, 8, 1), 0)
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* //=> Sun Aug 31 2014 00:00:00
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*
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* @example
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* // If week starts with Monday, set Sunday to 1 September 2014:
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* var result = setDay(new Date(2014, 8, 1), 0, {weekStartsOn: 1})
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* //=> Sun Sep 07 2014 00:00:00
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*/
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function setDay (dirtyDate, dirtyDay, dirtyOptions) {
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var weekStartsOn = dirtyOptions ? (Number(dirtyOptions.weekStartsOn) || 0) : 0
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var date = parse(dirtyDate)
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var day = Number(dirtyDay)
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var currentDay = date.getDay()
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var remainder = day % 7
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var dayIndex = (remainder + 7) % 7
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var diff = (dayIndex < weekStartsOn ? 7 : 0) + day - currentDay
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return addDays(date, diff)
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}
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module.exports = setDay
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