How to convert date to date format using JQuery

In website development, date conversion is a very common requirement. In many cases, we need to convert date strings into standard date formats so that dates can be easily compared, calculated, and displayed. The JQuery framework provides a simpler method to handle date format conversion.

This article will introduce how to use JQuery to convert a date string into a standard date format, and provide some example code to illustrate specific operations.

1. Import the JQuery library file

Before using JQuery to process the date format, you need to introduce the JQuery library file first. It can be introduced through the following code:

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>

2. Convert the date string into a date object

In the JQuery framework, you can use the Date() function to convert the date Convert string to date object. The syntax is as follows:

new Date(dateString);

Among them, dateString is a string representing the date and can contain the following content:

• A string containing date and time information, For example: "2021-06-29 10:30:00"
• A string containing only date information, such as: "2021-06-29"
• A string containing only time information , such as: "10:30:00"

The following is an example code to convert the date string "2021-06-29" into a date object:

var dateObj = new Date("2021-06-29");

3. Convert a date object into a string in a specified format

In JQuery, you can use the date.format() function to format a date object into a string in a specified format. The syntax is as follows:

dateObj.format(formatString);

Among them, formatString is a string representing the date format and can contain the following placeholders:

• yyyy: Four-digit year, such as: "2021"
• yy: Two-digit year, such as: "21"
• MM: month, such as: "06"
• M: month without leading zero, such as: "6"
• dd: with Dates with leading zeros, such as: "29"
• d: Dates without leading zeros, such as: "29"
• HH: with The number of hours with leading zeros, in 24-hour format, such as: "10"
• H: The number of hours without leading zeros, in 24-hour format, such as: "10"
• hh: The number of hours with leading zeros, 12-hour format, such as: "10"
• h: The number of hours without leading zeros, 12 hours system, such as: "10"
• mm: minutes with leading zeros, such as: "30"
• m: without leading Zero minutes, such as: "30"
• ss: Seconds with leading zeros, such as: "00"
• s: Number of seconds without leading zeros, such as: "0"
• a: Lowercase am or pm designation, such as: "am" or "pm"

The following is an example code that formats the date object dateObj into the string of "2021-06-29":

var dateString = $.format.date(dateObj, "yyyy-MM-dd");

4. Complete example code

The following is a complete example code that generates the first day of the next month based on the current time:

$(document).ready(function(){
  var nowDate = new Date(); //当前时间
  var nextMonth = new Date(nowDate.setMonth(nowDate.getMonth()+1)); //下一个月
  nextMonth.setDate(1); //设置为下一个月的第一天
  var firstDate = $.format.date(nextMonth, "yyyy-MM-dd"); //格式化日期为"yyyy-MM-dd"的字符串
  alert(firstDate); //弹出结果
});

The above is how to use JQuery to convert a date string into a date format. I hope it will be helpful to you.

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