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import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
* @name getDecade
* @category Decade Helpers
* @summary Get the decade of the given date.
*
* @description
* Get the decade of the given date.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* @param {Date|Number} date - the given date
* @returns {Number} the year of decade
* @throws {TypeError} 1 argument required
*
* @example
* // Which decade belongs 27 November 1942?
* const result = getDecade(new Date(1942, 10, 27))
* //=> 1940
*/
export default function getDecade(dirtyDate) {
requiredArgs(1, arguments);
var date = toDate(dirtyDate);
var year = date.getFullYear();
var decade = Math.floor(year / 10) * 10;
return decade;
}
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