时间格式转换

var z_time = Date.parse('Jul 4, 2018 12:00:00 AM');//先转成时间戳
    function timestampToTime( z_time ) {    //时间戳为10位需*1000，时间戳为13位的话不需乘1000在转成yymmdd
        var date = new Date( z_time );  
        var y = date.getFullYear();    
        var m = date.getMonth() + 1;    
        m = m < 10 ? ('0' + m) : m;    
        var d = date.getDate();    
        d = d < 10 ? ('0' + d) : d;    
        var h = date.getHours();  
        h = h < 10 ? ('0' + h) : h;  
        var minute = date.getMinutes();  
        var second = date.getSeconds();  
        minute = minute < 10 ? ('0' + minute) : minute;    
        second = second < 10 ? ('0' + second) : second;   
        return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;    
    };  
    var a = timestampToTime(z_time)
    console.log(a);