Javascript timestamp and PHP timestamp conversion considerations_Basic knowledge

What should be noted here is that the timestamp of js is 13 digits, and the timestamp of php is 10 digits. The conversion function is as follows:

Copy code The code is as follows:

var nowtime = (new Date).getTime();/*Current timestamp*/
/*Convert time and calculate the difference*/
function comptime (beginTime,endTime){
var secondNum = parseInt((endTime-beginTime*1000)/1000);//Calculate timestamp difference
if(secondNum>=0&&secondNum<60){
return secondNum 'Seconds ago';
}
else if (secondNum>=60&&secondNum<3600){
var nTime=parseInt(secondNum/60);
return nTime 'minutes ago';
}
else if (secondNum>=3600&&secondNum<3600*24){
var nTime=parseInt(secondNum/3600);
return nTime 'hours ago';
}
else{
var nTime = parseInt(secondNum/86400);
return nTime 'days ago';
}
}
t = comptime("1324362556",nowtime);//timestamp is PHP through ajax Returned timestamp
alert(t);