How do you convert a Javascript timestamp into UTC format?

Question

For example if you receive a timestamp in Javascript:

1291656749000

How would you create a function to convert the timestamp into UTC like:

2010/12/6 05:32:30pm

Answer 1

(new Date(1291656749000)).toUTCString() 

Is this what you're looking for?

Answer 2

I would go with (new Date(integer)).toUTCString(),

but if you have to have the 'pm', you can format it yourself:

function utcformat(d){     d= new Date(d);     var tail= 'GMT', D= [d.getUTCFullYear(), d.getUTCMonth()+1, d.getUTCDate()],     T= [d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds()];     if(+T[0]> 12){         T[0]-= 12;         tail= ' pm '+tail;     }     else tail= ' am '+tail;     var i= 3;     while(i){         --i;         if(D[i]<10) D[i]= '0'+D[i];         if(T[i]<10) T[i]= '0'+T[i];     }     return D.join('/')+' '+T.join(':')+ tail; } 

alert(utcformat(1291656749000))

/* returned value: (String) 2010/12/06 05:32:29 pm GMT */