You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
26 lines
922 B
26 lines
922 B
var addISOYears = require('../add_iso_years/index.js') |
|
|
|
/** |
|
* @category ISO Week-Numbering Year Helpers |
|
* @summary Subtract the specified number of ISO week-numbering years from the given date. |
|
* |
|
* @description |
|
* Subtract the specified number of ISO week-numbering years from the given date. |
|
* |
|
* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date |
|
* |
|
* @param {Date|String|Number} date - the date to be changed |
|
* @param {Number} amount - the amount of ISO week-numbering years to be subtracted |
|
* @returns {Date} the new date with the ISO week-numbering years subtracted |
|
* |
|
* @example |
|
* // Subtract 5 ISO week-numbering years from 1 September 2014: |
|
* var result = subISOYears(new Date(2014, 8, 1), 5) |
|
* //=> Mon Aug 31 2009 00:00:00 |
|
*/ |
|
function subISOYears (dirtyDate, dirtyAmount) { |
|
var amount = Number(dirtyAmount) |
|
return addISOYears(dirtyDate, -amount) |
|
} |
|
|
|
module.exports = subISOYears
|
|
|