How do you convert a Javascript timestamp into UTC format?

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

2 Answers

(new Date(1291656749000)).toUTCString() 

Is this what you're looking for?

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 */