datetime - How do I convert a date/time to HST in JavaScript? -

trying convert date string hst time, not work.

relevant code:

var minutes_in_milli = 60000,     hours_in_milli = 3600000,     utc2hst_offset = 10,     date1 = new date('2013-05-31t00:00:00z'),     utc1 = date1.gettime() + (date1.gettimezoneoffset() * minutes_in_milli),     hstdate1 = utc1 - (hours_in_milli * utc2hst_offset); 

i go out on limb , problem introducing both known fixed offset (10 hours), , derived offset gettimezoneoffset().

you don't want:

utc1 = date1.gettime() + (date1.gettimezoneoffset() * minutes_in_milli) 

from variable name gave it, assume want utc timestamp, do:

utc1 = date1.gettime() 

but without additional information requested in comments, can't sure after. please update question , modify answer necessary.