Summary of methods for obtaining current time and time conversion in js

Get the current date and time year, month, day, hour, minute, second

	var date = new Date();
    var year = date.getFullYear() // 年
    var  month = this.checkTime(date.getMonth() + 1) //月
    var day = this.checkTime(date.getDate()) //日
    var hour = this.checkTime(date.getHours()) //时
    var  minutes = this.checkTime(date.getMinutes()) //分
    var seconds = this.checkTime(date.getSeconds()) //秒
    console.log("获取当前日期时间",year + "-" + month + "-" + day + " " + hour + ":" + minutes + ":" + seconds);
    function checkTime(i){
    
    //月日时分秒不足10时,补全0
        if(i < 10){
    
    
            i = '0' + i
        }
        return i
    }

print result:

Convert yyyyMMddHHmmss to Date type

	var dateStr = '20221112010359'
    //匹配yyyyMMddHHmmss格式的日期
    var pattern = /(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/;
    //将时间格式化成 yyyy-MM-dd HH:mm:ss
    var formatDateStr = dateStr.replace(pattern, '$1/$2/$3 $4:$5:$6');
    //将时间转成Date
    var formatDate = new Date(formatDateStr);

print result

yyyymmdd hh:mm:ss characters converted to Date

	var dateString="20221112 01:03:59";
    var pattern = /(\d{4})(\d{2})(\d{2})/;
    var formatedDate = dateString.replace(pattern, '$1/$2/$3');
    var date = new Date(formatedDate);

print result

Mutual conversion between timestamp and date format in js:

1. Convert timestamp to date format:

	function  timestampToTime(timestamp) {
    
    
        var date = new Date(timestamp * 1000); //时间戳为10位需*1000，时间戳为13位的话不需乘1000
        var year = date.getFullYear() // 年
	    var  month = this.checkTime(date.getMonth() + 1) //月
	    var day = this.checkTime(date.getDate()) //日
	    var hour = this.checkTime(date.getHours()) //时
	    var  minutes = this.checkTime(date.getMinutes()) //分
	    var seconds = this.checkTime(date.getSeconds()) //秒
        return  year + "-" + month + "-" + day + " " + hour + ":" + minutes + ":" + seconds;
     }
     function checkTime(i){
    
    //月日时分秒不足10时,补全0
        if(i < 10){
    
    
            i = '0' + i
        }
        return i
    }
     console.log(timestampToTime(1669274673)); //2022-11-24 15:24:33

2. Convert the date format to a timestamp:

 var date = new Date('2022-11-24 15:24:33:123');
     // 有三种方式获取
     var  time1 = date.getTime();
     var  time2 = date.valueOf();
     var  time3 = Date.parse(date);
     console.log(time1); //1669274673123 精确到毫秒
     console.log(time2); //1669274673123 精确到毫秒
     console.log(time3); //1669274673000 只能精确到秒，毫秒用000替代