nodejs date to string

Node.js is a platform for building efficient, scalable web applications using JavaScript. Node.js supports multiple operating systems, is highly scalable, and can handle a large number of concurrent requests. In the development of Node.js, we often need to format or convert dates.

In Node.js, the Date object is a class used to handle dates and times. It internally uses a 64-bit integer to store date and time. This integer is incremented since January 1, 1970 and is measured in units of 1 millisecond. This integer is called a Unix timestamp.

For example, we can use the following code to create a Date object:

let now = new Date();

At this time, the now object contains the current date and time.

If we need to convert a Date object into a string, we can use methods such as toISOString, toUTCString or toLocaleDateString. Here are two common methods.

toISOString method

The toISOString method converts the current Date object into an ISO format string. The format is: YYYY-MM-DDTHH:mm:ss.sssZ. Among them, YYYY represents the year, MM represents the month, DD represents the day, HH represents the hour, mm represents the minute, ss represents the second, and sss represents the millisecond.

Sample code:

let now = new Date();
let str = now.toISOString();
console.log(str);

Output result:

2021-08-31T13:38:49.358Z

strftime method

The strftime method can format the Date object into the specified date format. It is a third-party library that needs to be installed using npm first:

npm install strftime

After the installation is complete, you can use the following code to introduce it:

const strftime = require('strftime');

Strftime uses placeholders to represent date and time formats. For example, %Y represents a four-digit year, %m represents a two-digit month, %d represents a two-digit day, %H represents a two-digit hour, %M represents a two-digit minute, % S represents two-digit seconds. See strftime's documentation for other placeholders.

Sample code:

const strftime = require('strftime');
let now = new Date();
let str = strftime('%Y-%m-%d %H:%M:%S', now);
console.log(str);

Output result:

2021-08-31 14:02:09

In this way, we can easily convert the date into the string format we need.

Summary: In Node.js, you can use toISOString, toUTCString or strftime methods to convert Date objects into strings. Among them, the toISOString method converts the Date object into an ISO format string, and the strftime method can format the Date object into the specified date format. By using these methods, we can easily convert and process date formats.

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