javascript - JS get date in UTC time -

i've created date in js so:

var mydate = new date('2013-01-01 00:00:00'); 

i assume js reads in utc time. when mydate.gettime() timestamp returned 4am gmt time.

why this? , how date midnight in utc time?

at least in chrome, works:

var mydate = new date('2013-01-01 00:00:00 utc');

it works if put gmt instead of utc. don't know if cross-browser enough.