Manipulating Dates with Day.js — Parsing and Validation

Day.js is a JavaScript library that lets us manipulate dates in our apps.

In this article, we’ll look at how to use Day.js to manipulate dates in our JavaScript apps.

Parsing Date to UTC Date

We can use the utc plugin to parse a date into a UTC date.

For instance, we can write:

const dayjs = require("dayjs");
const utc = require("dayjs/plugin/utc");

dayjs.extend(utc);
const dt = dayjs.utc().format();
console.log(dt);

to import the Day.js with the utc plugin.

Then we can use the plugin by writing:

dayjs.extend(utc);

Now we can call the dayjs.utc method to create a date object with the current date and time in UTC.

Clone a Date

We can clone a Day.js date object with the clone method.

For instance, we can write:

const dayjs = require("dayjs");
const a = dayjs();
const b = a.clone();
console.log(a, b);

We call dayjs to create date object a .

Then we call clone on a and assign it to b to make b a clone of a .

Validation

To validate a date, we can use the isValid method.

It returns true if the date is valid and false otherwise.

For instance, we can write:

const dayjs = require("dayjs");
const isValid = dayjs().isValid();
console.log(isValid);

We call isValid on a Day.js date object.

Since we called in a valid date, isValid is true.

Conclusion

Day.js is a JavaScript library that lets us manipulate dates in our apps.

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