Clone moment js object

Question

I have momentjs object in state

 state = { startDate: getNow() //this funtion return a momemtJS object }

in one function, I need to get the date one year before startDate

const dateBeforeOneYear = this.state.startDate.subtract(1, 'years');

But if I do like this, I modify the state by mistake

So I try to copy the state

const copyStartDate = {...this.state.startDate} const copyStartDate = this.state.startDate.subtract(1, 'years');

But now I get the error, substract is not a function, I guess because copyStartDate is no more MomemntJs

store date only in state variable, anytime you want moment object pass the date into moment, that will be a better approach i think. — Mayank Shukla
– Mayank Shukla, Commented Sep 14, 2018 at 12:37

Tom Fenech · Accepted Answer · 2018-09-14 12:47:58Z

There's a method to clone a moment object:

const yearBefore = this.state.startDate.clone().subtract(1, 'years');

It would also be a better idea to store a serialisable representation of the date in your component state, such as the result of calling .valueOf() on either a Date or a Moment, either of which returns the number of milliseconds since the UNIX epoch.

Penny Liu · Accepted Answer · 2022-03-23 06:10:26Z

moment.js has its own api for cloning moment object.

var copy = momentObj.clone();

And I agree on storing dates serialize representation instead of Object in store.

JayCodist · Accepted Answer · 2020-08-18 03:28:48Z

It's also possible to copy a moment object through it's constructor. Like so

const firstMoment = moment("2020-08-18"); const clone = moment(firstMoment);

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