bc518174
 王天杨
提交两个项目文件
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"use strict";
exports.getDecade = getDecade;
var _index = require("./toDate.js");
/**
* @name getDecade
* @category Decade Helpers
* @summary Get the decade of the given date.
*
* @description
* Get the decade of the given date.
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
*
* @param date - The given date
*
* @returns The year of decade
*
* @example
* // Which decade belongs 27 November 1942?
* const result = getDecade(new Date(1942, 10, 27))
* //=> 1940
*/
function getDecade(date) {
// TODO: Switch to more technical definition in of decades that start with 1
// end with 0. I.e. 2001-2010 instead of current 2000-2009. It's a breaking
// change, so it can only be done in 4.0.
const _date = (0, _index.toDate)(date);
const year = _date.getFullYear();
const decade = Math.floor(year / 10) * 10;
return decade;
}
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