gistfile1.js

    // https://github.com/ganglia/ganglia-web/blob/master/templates/default/header.tpl#L129
    function setStartAndEnd(startTime, endTime) {
      // we're getting local start/end times.
console.log('start', new Date(startTime*1000), 'end', new Date(endTime*1000));

        var local_offset = new Date().getTimezoneOffset() * 60;
console.log('local_offset', local_offset);
console.log('server_utc_offset', server_utc_offset);

        var delta = -server_utc_offset - local_offset;
console.log('delta', delta);

        var date = new Date((Math.floor(startTime) + delta) * 1000);
console.log('date', date);

        $("#datepicker-cs").val(rrdDateTimeString(date));
        date = new Date((Math.floor(endTime) + delta) * 1000);
        $("#datepicker-ce").val(rrdDateTimeString(date));
    }

    initShowEvent();
  });

/*
Server is UTC.  Brower is UTC-6.

Results:

start Date {Tue Feb 07 2012 11:16:09 GMT-0600 (CST)} end Date {Tue Feb 07 2012 11:47:21 GMT-0600 (CST)}

local_offset 21600

server_utc_offset 0

delta -21600

date Date {Tue Feb 07 2012 05:16:09 GMT-0600 (CST)}
*/