es.date.set-year.js

'use strict';
var $ = require('../internals/export');
var uncurryThis = require('../internals/function-uncurry-this');
var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');

var DatePrototype = Date.prototype;
var thisTimeValue = uncurryThis(DatePrototype.getTime);
var setFullYear = uncurryThis(DatePrototype.setFullYear);

// `Date.prototype.setYear` method
// https://tc39.es/ecma262/#sec-date.prototype.setyear
$({ target: 'Date', proto: true }, {
  setYear: function setYear(year) {
    // validate
    thisTimeValue(this);
    var yi = toIntegerOrInfinity(year);
    var yyyy = yi >= 0 && yi <= 99 ? yi + 1900 : yi;
    return setFullYear(this, yyyy);
  }
});