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How to format date in js

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2019-05-29 13:59:0721104browse

1.将日期转换为指定的格式

How to format date in js

比如转换成 年月日时分秒 这种格式:yyyy-MM-dd hh:mm:ss 或者 yyyy-MM-dd。当然是网上的方法,只是总结下。

可以为Date原型添加如下的方法:

Date.prototype.format = function(fmt) { 
     var o = { 
        "M+" : this.getMonth()+1,                 //月份 
        "d+" : this.getDate(),                    //日 
        "h+" : this.getHours(),                   //小时 
        "m+" : this.getMinutes(),                 //分 
        "s+" : this.getSeconds(),                 //秒 
        "q+" : Math.floor((this.getMonth()+3)/3), //季度 
        "S"  : this.getMilliseconds()             //毫秒 
    }; 
    if(/(y+)/.test(fmt)) {
            fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); 
    }
     for(var k in o) {
        if(new RegExp("("+ k +")").test(fmt)){
             fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
         }
     }
    return fmt; 
}

比如我们可以这样调用下:

var time1 = new Date().format("yyyy-MM-dd hh:mm:ss");
console.log(time1);

也可以转换成 ”年月日”的格式 

var time2 = new Date().format("yyyy-MM-dd");
console.log(time2);

2. 将指定的日期转换为"年月日"的格式,代码如下:

    var oldTime = (new Date("2012/12/25 20:11:11")).getTime();
    var curTime = new Date(oldTime).format("yyyy-MM-dd");
    console.log(curTime);

3. 将 "时间戳" 转换为 "年月日" 的格式.

  比如如下代码: 

    var da = 1402233166999;
    da = new Date(da);
    var year = da.getFullYear()+'年';
    var month = da.getMonth()+1+'月';
    var date = da.getDate()+'日';
    console.log([year,month,date].join('-'));

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