39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
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import toInteger from "../_lib/toInteger/index.js";
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import toDate from "../toDate/index.js";
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import requiredArgs from "../_lib/requiredArgs/index.js";
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/**
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* @name addDays
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* @category Day Helpers
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* @summary Add the specified number of days to the given date.
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*
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* @description
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* Add the specified number of days to the given date.
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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 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 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 days to 1 September 2014:
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* const result = addDays(new Date(2014, 8, 1), 10)
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* //=> Thu Sep 11 2014 00:00:00
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*/
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export default function addDays(dirtyDate, dirtyAmount) {
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requiredArgs(2, arguments);
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var date = toDate(dirtyDate);
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var amount = toInteger(dirtyAmount);
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if (isNaN(amount)) {
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return new Date(NaN);
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}
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if (!amount) {
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// If 0 days, no-op to avoid changing times in the hour before end of DST
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return date;
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}
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date.setDate(date.getDate() + amount);
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return date;
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}
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