@progress/kendo-date-math/dist/es2015/first-year-of-decade.js

Kendo UI typescript package exporting functions for Date manipulations

import { normalizeYear } from './normalize-year';
/**
 * A function that returns a `Date` object of the first year in a decade.
 *
 * @param date - The start date value.
 * @returns - The first year in a decade.
 *
 * @example
 * ```ts-no-run
 * firstYearOfDecade(new Date(2017, 0, 1)); // 2010-1-1
 * firstYearOfDecade(new Date(2007, 10, 22)); // 2000-11-22
 * firstYearOfDecade(new Date(2026, 0, 1)); // 2020-1-1
 * ```
 */
export const firstYearOfDecade = (value) => (normalizeYear(value, (y) => y - (y % 10)));