2 var fails = require('../internals/fails');
3 var padStart = require('../internals/string-pad').start;
6 var DatePrototype = Date.prototype;
7 var getTime = DatePrototype.getTime;
8 var nativeDateToISOString = DatePrototype.toISOString;
10 // `Date.prototype.toISOString` method implementation
11 // https://tc39.es/ecma262/#sec-date.prototype.toisostring
12 // PhantomJS / old WebKit fails here:
13 module.exports = (fails(function () {
14 return nativeDateToISOString.call(new Date(-5e13 - 1)) != '0385-07-25T07:06:39.999Z';
15 }) || !fails(function () {
16 nativeDateToISOString.call(new Date(NaN));
17 })) ? function toISOString() {
18 if (!isFinite(getTime.call(this))) throw RangeError('Invalid time value');
20 var year = date.getUTCFullYear();
21 var milliseconds = date.getUTCMilliseconds();
22 var sign = year < 0 ? '-' : year > 9999 ? '+' : '';
23 return sign + padStart(abs(year), sign ? 6 : 4, 0) +
24 '-' + padStart(date.getUTCMonth() + 1, 2, 0) +
25 '-' + padStart(date.getUTCDate(), 2, 0) +
26 'T' + padStart(date.getUTCHours(), 2, 0) +
27 ':' + padStart(date.getUTCMinutes(), 2, 0) +
28 ':' + padStart(date.getUTCSeconds(), 2, 0) +
29 '.' + padStart(milliseconds, 3, 0) +
31 } : nativeDateToISOString;