In JavaScript, the moment.js library provides a simple and convenient way to manipulate date and time objects. One common task is adding or subtracting time from a moment object.

To add or subtract time from a moment object, you can use the add and subtract methods provided by the moment object. These methods modify the moment object in place and return the modified moment.

Here’s an example of how to add time to a moment object:

const moment = require('moment');

// Create a moment object for the current time
const now = moment();

// Add 1 hour to the current time
const futureTime = now.add(1, 'hour');

console.log(futureTime.format('YYYY-MM-DD HH:mm:ss'));

Output:

2022-01-01 14:00:00 

In the example above, we import the moment library and create a moment object for the current time using moment(). Then, we use the add method to add 1 hour to the current time. Finally, we format the modified moment object using format method and print it to the console.

Similarly, you can subtract time from a moment object by using the subtract method. Here’s an example:

const moment = require('moment');

// Create a moment object for the current time
const now = moment();

// Subtract 30 minutes from the current time
const pastTime = now.subtract(30, 'minutes');

console.log(pastTime.format('YYYY-MM-DD HH:mm:ss'));

Output:

2022-01-01 12:30:00 

In the example above, we subtracted 30 minutes from the current time and formatted the modified moment object using the format method.

By using the add and subtract methods provided by the moment library, you can easily manipulate moment objects and perform various date and time calculations in JavaScript.

#momentjs #javascript