var timerID ;



function tzone(tz, os, ds, cl)

{

	this.ct = new Date(0) ;		// datetime

	this.tz = tz ;		// code

	this.os = os ;		// GMT offset

	this.ds = ds ;		// has daylight savings

	this.cl = cl ;		// font color

}



function UpdateClocks()

{

	// www.timeanddate.com/worldclock

	var ct = new Array(

		new tzone('POL: ', +1, 1, '#5f442b'),

		new tzone('LON: ', 0, 1, '#5f442b'),

		new tzone('HKG: ', +8, 0, '#5f442b'),

		new tzone('NY: ', -5, 0, '#5f442b')		

	) ;



	var dt = new Date() ;	// [GMT] time according to machine clock



	var startDST = new Date(dt.getFullYear(), 3, 1) ;

	while (startDST.getDay() != 0)

		startDST.setDate(startDST.getDate() + 1) ;



	var endDST = new Date(dt.getFullYear(), 9, 31) ;

	while (endDST.getDay() != 0)

		endDST.setDate(endDST.getDate() - 1) ;



	var ds_active ;		// DS currently active

	if (startDST < dt && dt < endDST)

		ds_active = 1 ;

	else

		ds_active = 0 ;



	// Adjust each clock offset if that clock has DS and in DS.

	for(n=0 ; n<ct.length ; n++)

		if (ct[n].ds == 1 && ds_active == 1) ct[n].os++ ;



	// compensate time zones

	gmdt = new Date() ;

	for (n=0 ; n<ct.length ; n++)

		ct[n].ct = new Date(gmdt.getTime() + ct[n].os * 3600 * 1000) ;



	document.getElementById('Clock0').innerHTML =

		'<img src="_var/polska18x11.png" /> <font color="' + ct[0].cl + '">' + /*ct[0].tz + */ClockString(ct[0].ct) + '</font>' ;



	document.getElementById('Clock1').innerHTML =

		'<img src="_var/angielska18x11.png" /> <font color="' + ct[1].cl + '">' + /*ct[1].tz + */ClockString(ct[1].ct) + '</font>' ;



	document.getElementById('Clock2').innerHTML =

		'<img src="_var/hongkong.png" /> <font color="' + ct[2].cl + '">' + /*ct[2].tz + */ClockString(ct[2].ct) + '</font>' ;



	document.getElementById('Clock3').innerHTML =

		'<img src="_var/usa.png" /> <font color="' + ct[3].cl + '">' + /*ct[3].tz + */ClockString(ct[3].ct) + '</font>' ;



	



	

	timerID = window.setTimeout("UpdateClocks()", 1001) ;

}



function ClockString(dt)

{

	var stemp, ampm ;



	var dt_year = dt.getUTCFullYear() ;

	var dt_month = dt.getUTCMonth() + 1 ;

	var dt_day = dt.getUTCDate() ;

	var dt_hour = dt.getUTCHours() ;

	var dt_minute = dt.getUTCMinutes() ;

	var dt_second = dt.getUTCSeconds() ;

	

	dt_year = dt_year.toString() ;

	
	if (dt_day < 10)

		dt_day = '0' + dt_day ;

	
	if (dt_month < 10)

		dt_month = '0' + dt_month ;

	
	if (dt_hour < 10)

		dt_hour = '0' + dt_hour ;
	

	if (dt_minute < 10)

		dt_minute = '0' + dt_minute ;

	

	if (dt_second < 10)

		dt_second = '0' + dt_second ;



	stemp = dt_day + '.' + dt_month + '.' + dt_year ;

	stemp = stemp + ' ' + dt_hour + ":" + dt_minute + ":" + dt_second;

	return stemp ;

}