Difference between moment.toString() and moment.toISOString()

Question

I have reading moment.js document, there have a moment.toISOString() function for helps to formats a string to the ISO8601 standard.

Also there have a another one reason for why we use moment.toISOString()

moment.toISOString() function using for performance reasons.

I don't know toISOString() the performance best than moment.toString().But only the result was difference while using moment.toString() and moment.toISOString().

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So my question is.

• Why we should use moment.toISOString()? for performance reasons?

• And what is the difference between moment.toISOString() and moment.toString()?

Answer 1

You can give a look directly in momentJS source code for such issue :). Here it is.

export function toString () {     return this.clone().locale('en').format('ddd MMM DD YYYY HH:mm:ss [GMT]ZZ'); }  export function toISOString () {     var m = this.clone().utc();     if (0 < m.year() && m.year() <= 9999) {         if ('function' === typeof Date.prototype.toISOString) {             // native implementation is ~50x faster, use it when we can             return this.toDate().toISOString();         } else {             return formatMoment(m, 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]');         }     } else {         return formatMoment(m, 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]');     } } 

• toString use .locale('en').format('ddd MMM DD YYYY HH:mm:ss [GMT]ZZ') which is momentJS source code, executed in Javascript
• toISOString() use javascript Date object (this.toDate().toISOString();) which is compile and managed by your browser.

Native implementation is ~50x faster, use it when we can

However, I think such difference is not relevant for a most projects, but now you know. ;)