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28 lines
882 B
28 lines
882 B
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 isFirstDayOfMonth
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* @category Month Helpers
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* @summary Is the given date the first day of a month?
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*
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* @description
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* Is the given date the first day of a month?
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*
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* ### v2.0.0 breaking changes:
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*
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
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*
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* @param {Date|Number} date - the date to check
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* @returns {Boolean} the date is the first day of a month
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* @throws {TypeError} 1 argument required
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*
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* @example
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* // Is 1 September 2014 the first day of a month?
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* var result = isFirstDayOfMonth(new Date(2014, 8, 1))
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* //=> true
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*/
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export default function isFirstDayOfMonth(dirtyDate) {
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requiredArgs(1, arguments);
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return toDate(dirtyDate).getDate() === 1;
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} |