How to convert javascript int to date

The Int type in JavaScript is an integer type, while the Date type is an object type used to handle dates and times. In some cases, we may need to convert Int type to Date type. Below we will explain in detail how to implement this operation in JavaScript.

1. Convert the Int type to a timestamp
In JavaScript, we can convert the date represented by the Int type into a timestamp. The timestamp is a number representing the date and time, usually starting from "1970" Calculation starts at 00:00:00 on January 1st of the year. The following is the code implementation for converting the Int type to a timestamp:

var timestamp = 1581229800000; // Int类型的日期
var date = new Date(timestamp); // 将Int类型的日期转换为Date类型
var time = date.getTime(); // 将Date类型的日期转换为时间戳
console.log(time); // 输出1581229800000

2. Convert the Int type to a date string
We can also convert the Int type to a date string. The date string follows A string representing date and time in a certain format. The following is the code implementation for converting the Int type into a date string:

var timestamp = 1581229800000; // Int类型的日期
var date = new Date(timestamp); // 将Int类型的日期转换为Date类型
var year = date.getFullYear(); // 获取年份
var month = date.getMonth() + 1; // 获取月份，需要加1
var day = date.getDate(); // 获取日期
var hours = date.getHours(); // 获取小时
var minutes = date.getMinutes(); // 获取分钟
var seconds = date.getSeconds(); // 获取秒钟
var dateStr = year + '-' + month + '-' + day + ' ' + hours + ':' + minutes + ':' + seconds; // 拼接日期字符串
console.log(dateStr); // 输出2020-2-9 16:10:0

3. Convert the Int type into a date string in the specified format
We can also convert the Int type into a date in the specified format and time as a date string. The following is the code implementation for converting the Int type to a date string in a specified format:

var timestamp = 1581229800000; // Int类型的日期
var date = new Date(timestamp); // 将Int类型的日期转换为Date类型
var year = date.getFullYear(); // 获取年份
var month = date.getMonth() + 1; // 获取月份，需要加1
var day = date.getDate(); // 获取日期
var hours = date.getHours(); // 获取小时
var minutes = date.getMinutes(); // 获取分钟
var seconds = date.getSeconds(); // 获取秒钟
var dateStr = year + '-' + addZero(month) + '-' + addZero(day) + ' ' + addZero(hours) + ':' + addZero(minutes) + ':' + addZero(seconds); // 拼接日期字符串
console.log(dateStr); // 输出2020-02-09 16:10:00

// 补零函数
function addZero(num){
   return num < 10 ? '0' + num : num;
}

In this way, we can perfectly convert the Int type into a date string with a certain format.

4. Summary
Int type and Date type are two different data types in JavaScript, but in some cases, we need to convert the Int type into a Date type or date string. This article introduces how to convert the Int type into a Date type, a timestamp, and a date string in a specified format. I hope it will be helpful to you.

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