69 lines
1.6 KiB
JavaScript
69 lines
1.6 KiB
JavaScript
/**
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* @copyright Copyright (c) 2019 Georg Ehrke
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*
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* @author Georg Ehrke <oc.list@georgehrke.com>
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*
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* @license AGPL-3.0-or-later
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* Gets the ByDay and BySetPosition
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*
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* @param {Date} jsDate The date to get the weekday of
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* @return {object}
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*/
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export function getBySetPositionAndBySetFromDate(jsDate) {
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const byDay = getWeekDayFromDate(jsDate)
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let bySetPosition = 1
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let dayOfMonth = jsDate.getDate()
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for (; dayOfMonth > 7; dayOfMonth -= 7) {
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bySetPosition++
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}
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return {
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byDay,
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bySetPosition,
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}
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}
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/**
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* Gets the string-representation of the weekday of a given date
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*
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* @param {Date} jsDate The date to get the weekday of
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* @return {string}
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*/
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export function getWeekDayFromDate(jsDate) {
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switch (jsDate.getDay()) {
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case 0:
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return 'SU'
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case 1:
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return 'MO'
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case 2:
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return 'TU'
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case 3:
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return 'WE'
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case 4:
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return 'TH'
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case 5:
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return 'FR'
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case 6:
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return 'SA'
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default:
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throw TypeError('Invalid date-object given')
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}
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}
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