Modify date format javascript

How to modify the date format in JavaScript?

There are many ways to represent dates in JavaScript, such as date objects and date strings. In actual development, we often need to format the date into a specified form. This article will introduce how to modify the date format using JavaScript.

1. Date object

The Date object is a standard object for handling dates and times in JavaScript. We can use it to represent a specific date and time:

let currentDate = new Date();
console.log(currentDate); // 输出当前日期

The output result is:

Fri Oct 15 2021 14:10:30 GMT+0800 (中国标准时间)

2. Date formatting

In order to format the date into the specified form, we need to use some methods and properties of the Date object. For example:

• getDate(): Get the day in the date
• getMonth(): Get the month in the date (starting from 0)
• getFullYear(): Get the year in the date
• getHours(): Get the hours in the date (24-hour format)
• getMinutes(): Get the minutes in the date
• getSeconds(): Get the seconds in the date
• toLocaleDateString(): Convert the date to a local time string
• toLocaleTimeString(): Convert the time to a local time string

Based on these methods, we can customize the date formatting method, as follows:

function dateTimeFormatter(date) {
  const year = date.getFullYear();
  const month = (date.getMonth() + 1).toString().padStart(2, '0');
  const day = date.getDate().toString().padStart(2, '0');
  const hours = date.getHours().toString().padStart(2, '0');
  const minutes = date.getMinutes().toString().padStart(2, '0');
  const seconds = date.getSeconds().toString().padStart(2, '0');

  return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
}

const date = new Date();
console.log(dateTimeFormatter(date)); // 输出自定义格式化日期

The output result is:

2021-10-15 14:24:12

3. Date string to date object

If we have a date string and need to convert it to a date object, we can use the parse() method of the Date object:

const dateString = '2021-10-15T14:30:00';
const date = new Date(Date.parse(dateString));
console.log(date);

The output result is:

Fri Oct 15 2021 14:30:00 GMT+0800 (中国标准时间)

4. Date object to date string

If we have a date object and need to convert it to a date string, we can use the toISOString() and toLocaleString() methods of the Date object :

const date = new Date();
console.log(date.toISOString()); // 输出 ISO 格式的日期字符串
console.log(date.toLocaleString()); // 输出本地化日期时间字符串

The output results are:

2021-10-15T06:38:27.752Z
2021/10/15 上午6:38:27

5. Moment.js library

In addition to using native methods and functions in JavaScript, we also You can use the Moment.js library to handle dates and times. The library provides a rich API and tools to easily solve problems such as date formatting, date calculations, and time zone settings.

Example:

const date = moment(new Date()).format('YYYY-MM-DD HH:mm:ss');
console.log(date);

The output result is consistent with the custom formatted date output:

2021-10-15 15:17:24

Summary:

In JavaScript, we can use The native Date object and some methods and properties are used to handle dates and times. You can also use the Moment.js library to conveniently handle dates and times. Whether using JavaScript or the Moment.js library, we need to understand common date processing methods and related APIs to better handle dates and times.

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