When working with date and time in JavaScript, the Moment.js library is a go-to choice due to its powerful parsing and formatting capabilities. However, sometimes you may come across a scenario where the date and time string you need to parse is not in a standard format recognized by Moment.js. In such cases, you can still parse it using Moment.js by providing a custom format.

Here’s how you can parse a string formatted in a non-standard date/time format using Moment.js:

const moment = require('moment');

const dateString = '2021-03-15 06:30 PM';

const customFormat = 'YYYY-MM-DD hh:mm A';

const parsedDate = moment(dateString, customFormat);

console.log(parsedDate.format());  // Output: 2021-03-15T18:30:00+00:00

In the code snippet above, we start by importing the Moment.js library using the require statement. Then, we define the date string we want to parse in the dateString variable. In this example, the date string is '2021-03-15 06:30 PM'.

Next, we define the custom format that matches the format of the date string using Moment.js tokens. In this case, the format is 'YYYY-MM-DD hh:mm A'. The YYYY token represents the 4-digit year, MM represents the 2-digit month, DD represents the 2-digit day, hh represents the 2-digit hour in 12-hour format, mm represents the 2-digit minute, and A represents the meridiem (AM/PM).

Finally, we use the moment function to parse the date string using the custom format. The resulting parsed date object is stored in the parsedDate variable.

To verify that the parsing was successful, we use the format function of the parsedDate object to output the parsed date in the default format. In this example, the output is '2021-03-15T18:30:00+00:00', which represents the same date and time in the ISO 8601 format.

By providing a custom format, you can parse date and time strings in non-standard formats using Moment.js. This flexibility allows you to handle various date and time formats in your applications with ease.

#javascript #MomentJs