35 lines
1.0 KiB
JavaScript
35 lines
1.0 KiB
JavaScript
import { toDate } from "./toDate.mjs";
|
|
|
|
/**
|
|
* @name differenceInCalendarYears
|
|
* @category Year Helpers
|
|
* @summary Get the number of calendar years between the given dates.
|
|
*
|
|
* @description
|
|
* Get the number of calendar years between the given dates.
|
|
*
|
|
* @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 dateLeft - The later date
|
|
* @param dateRight - The earlier date
|
|
|
|
* @returns The number of calendar years
|
|
*
|
|
* @example
|
|
* // How many calendar years are between 31 December 2013 and 11 February 2015?
|
|
* const result = differenceInCalendarYears(
|
|
* new Date(2015, 1, 11),
|
|
* new Date(2013, 11, 31)
|
|
* )
|
|
* //=> 2
|
|
*/
|
|
export function differenceInCalendarYears(dateLeft, dateRight) {
|
|
const _dateLeft = toDate(dateLeft);
|
|
const _dateRight = toDate(dateRight);
|
|
|
|
return _dateLeft.getFullYear() - _dateRight.getFullYear();
|
|
}
|
|
|
|
// Fallback for modularized imports:
|
|
export default differenceInCalendarYears;
|