// JavaScript Document

function GetDstStart(arg_year) {
	var dst_start = new Date(arg_year, 3, 1, 2, 0, 0); 
	for (var i = 1; i <= 7; i++) {
		dst_start.setDate(i);
		if (0 == dst_start.getDay()) {
			break;
		}
	}
	return dst_start.getTime();
}


function GetDstEnd(arg_year) {
	var dst_end = new Date(arg_year, 9, 31, 1, 0, 0);
	for (var i = 31; i > 24; i--) {
		dst_end.setDate(i);
		if (0 == dst_end.getDay()) {
			break;
		}
	}
	return dst_end.getTime();
}


today = new Date();
year = today.getYear();
if (year < 100) {
	year += 1900;
}

var tz_offset = today.getTimezoneOffset();

pos_start = GetDstStart(year);
pos_end = GetDstEnd(year);

tz_jp = 9 * 60; // GMT+9
tz_ny = 14 * 60; // GMT-0500


function nowat(now_t, tz, st) {
	var hour, min, sec;

	var pos_t = now_t + (tz_offset + tz) * 60 * 1000;

	if (0 != st) {
		if ((pos_start <= pos_t) && (pos_end > pos_t)) {
			pos_t += 60 * 60 * 1000;
		}
	}			
	var t = new Date();
	t.setTime(pos_t);

	hour = t.getHours();
	min = t.getMinutes();
	sec = t.getSeconds();
	if (hour < 10) {
		hour = "0" + hour;
	}
	if (min < 10) {
		min = "0" + min;
	}
	if (sec < 10) {
		sec = "0" + sec;
	}
	return hour + ":" + min + ":" + sec; 
}

function update_watch() {
	now = new Date();
	n_t = now.getTime();
	jp = nowat(n_t, tz_jp, 0);
	ny = nowat(n_t, tz_ny, 1);

	document.forms[0].elements[0].value = jp;
	document.forms[0].elements[1].value = ny;

	setTimeout('update_watch()', 999); 
}

update_watch();