blob: fa892709306d0b90fabe238f55ec21ffc9b8f990 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
import toDate from '../toDate/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @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: Date | number): number {
requiredArgs(1, arguments)
const date = toDate(dirtyDate)
const year = date.getFullYear()
const decade = Math.floor(year / 10) * 10
return decade
}
|