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57 lines
2.3 KiB
57 lines
2.3 KiB
3 years ago
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import isWeekend from '../isWeekend/index.js';
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import toDate from '../toDate/index.js';
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import toInteger from '../_lib/toInteger/index.js';
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import requiredArgs from '../_lib/requiredArgs/index.js';
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import isSunday from '../isSunday/index.js';
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import isSaturday from '../isSaturday/index.js';
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/**
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* @name addBusinessDays
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* @category Day Helpers
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* @summary Add the specified number of business days (mon - fri) to the given date.
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*
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* @description
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* Add the specified number of business days (mon - fri) to the given date, ignoring weekends.
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*
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* @param {Date|Number} date - the date to be changed
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* @param {Number} amount - the amount of business days to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
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* @returns {Date} the new date with the business days added
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* @throws {TypeError} 2 arguments required
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*
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* @example
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* // Add 10 business days to 1 September 2014:
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* var result = addBusinessDays(new Date(2014, 8, 1), 10)
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* //=> Mon Sep 15 2014 00:00:00 (skipped weekend days)
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*/
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export default function addBusinessDays(dirtyDate, dirtyAmount) {
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requiredArgs(2, arguments);
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var date = toDate(dirtyDate);
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var startedOnWeekend = isWeekend(date);
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var amount = toInteger(dirtyAmount);
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if (isNaN(amount)) return new Date(NaN);
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var hours = date.getHours();
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var sign = amount < 0 ? -1 : 1;
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var fullWeeks = toInteger(amount / 5);
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date.setDate(date.getDate() + fullWeeks * 7); // Get remaining days not part of a full week
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var restDays = Math.abs(amount % 5); // Loops over remaining days
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while (restDays > 0) {
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date.setDate(date.getDate() + sign);
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if (!isWeekend(date)) restDays -= 1;
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} // If the date is a weekend day and we reduce a dividable of
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// 5 from it, we land on a weekend date.
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// To counter this, we add days accordingly to land on the next business day
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if (startedOnWeekend && isWeekend(date) && amount !== 0) {
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// If we're reducing days, we want to add days until we land on a weekday
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// If we're adding days we want to reduce days until we land on a weekday
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if (isSaturday(date)) date.setDate(date.getDate() + (sign < 0 ? 2 : -1));
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if (isSunday(date)) date.setDate(date.getDate() + (sign < 0 ? 1 : -2));
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} // Restore hours to avoid DST lag
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date.setHours(hours);
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return date;
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}
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