javascript时间戳 转换成时间

function a(m){
    return m<?'0'+m:m 
    }
function formatDate(time) { 
    var now = new Date(time);
    var year=now.getFullYear(); 
    var month=now.getMonth()+; 
    var date=now.getDate(); 
    var hour=now.getHours(); 
    var minute=now.getMinutes(); 
    var second=now.getSeconds(); 
    return year+"-"+a(month)+"-"+a(date)+" "+a(hour)+":"+a(minute)+":"+a(second); 
} 
print(formatDate());
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