// Title: Timestamp picker
// Description: See the demo at url
// URL: http://us.geocities.com/tspicker/
// Script featured on: http://javascriptkit.com/script/script2/timestamp.shtml
// Version: 1.0
// Date: 12-05-2001 (mm-dd-yyyy)
// Author: Denis Gritcyuk <denis@softcomplex.com>; <tspicker@yahoo.com>
// Notes: Permission given to use this script in any kind of applications if
//    header lines are left unchanged. Feel free to contact the author
//    for feature requests and/or donations

function show_calendar(str_target, str_datetime, lang) {
	if(lang=='de')
	{
		var arr_months = ["Jänner","Februar","März","April","Mai","Juni","Juli","August","September","Oktober","November","Dezember"];
		var week_days = ["So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"];
	}
	else
	{
		var arr_months = ["January","February","March","April","May","June","July","August","September","October","November","December"];
		var week_days = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"];
	}
	
	var n_weekstart = 1; // day week starts from (normally 0 or 1)

	var dt_datetime = (str_datetime == null || str_datetime =="" ?  new Date() : str2dt(str_datetime));
	var dt_prev_month = new Date(dt_datetime);
	dt_prev_month.setMonth(dt_datetime.getMonth()-1);
	var dt_next_month = new Date(dt_datetime);
	dt_next_month.setMonth(dt_datetime.getMonth()+1);
	var dt_firstday = new Date(dt_datetime);
	dt_firstday.setDate(1);
	dt_firstday.setDate(1-(7+dt_firstday.getDay()-n_weekstart)%7);
	var dt_lastday = new Date(dt_next_month);
	dt_lastday.setDate(0);
	
	// html generation (feel free to tune it for your particular application)
	// print calendar header
	var str_buffer = new String (
		'<html>\n'+
		'<head>\n'+
		'	<title>Calendar</title>\n'+
		'	<style type="text/css">\n'+
		'	@import "styles/screen.css";\n'+
		'	</style>\n'+
		'</head>\n'+
		'<body bgcolor="White">\n'+
		'<table class="clsOTable" cellspacing="0" border="0" width="100%">\n'+
		'<tr><td bgcolor="#4885D8">\n'+
		'<table cellspacing="1" cellpadding="3" border="0" width="100%">\n'+
		'<tr>\n	<td bgcolor="#4885D8"><a href="javascript:window.opener.show_calendar(\''+
		str_target+'\', \''+ dateToMove(dt_prev_month)+ /*'\'+document.cal.time.value)*/'\',\''+lang+'\');">'+
		'<img src="jscript/prev.gif" width="16" height="16" border="0"'+
		' alt="previous month"></a></td>\n'+
		'	<td bgcolor="#4885D8" colspan="5" align="center">'+
		'<font color="white" face="tahoma, verdana" size="2">'
		+arr_months[dt_datetime.getMonth()]+' '+dt_datetime.getFullYear()+'</font></td>\n'+
		'	<td bgcolor="#4885D8" align="right"><a href="javascript:window.opener.show_calendar(\''
		+str_target+'\', \''+dateToMove(dt_next_month)+ /*'\'+document.cal.time.value)*/'\',\''+lang+'\');">'+
		'<img src="jscript/next.gif" width="16" height="16" border="0"'+
		' alt="next month"></a></td>\n</tr>\n'
	);

	var dt_current_day = new Date(dt_firstday);
	// print weekdays titles
	str_buffer += '<tr>\n';
	for (var n=0; n<7; n++)
		str_buffer += '	<td bgcolor="#87CEFA">'+
		'<font color="white" face="tahoma, verdana" size="2">'+
		week_days[(n_weekstart+n)%7]+'</font></td>\n';
	// print calendar table
	str_buffer += '</tr>\n';
	while (dt_current_day.getMonth() == dt_datetime.getMonth() ||
		dt_current_day.getMonth() == dt_firstday.getMonth()) {
		// print row heder
		str_buffer += '<tr>\n';
		for (var n_current_wday=0; n_current_wday<7; n_current_wday++) {
				if (dt_current_day.getDate() == dt_datetime.getDate() &&
					dt_current_day.getMonth() == dt_datetime.getMonth())
					// print current date
					str_buffer += '	<td bgcolor="#FBB698" align="right">';
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += '	<td bgcolor="#DBEAF5" align="right">';
				else
					// print working days of current month
					str_buffer += '	<td bgcolor="white" align="right">';

				if (dt_current_day.getMonth() == dt_datetime.getMonth())
					// print days of current month
					str_buffer += '<a href="javascript:window.opener.'+str_target+
					'.value=\''+dateToReturn(dt_current_day)+ /*'\'+document.cal.time.value*/'\'; window.close();" class="calendar">'
				else 
					// print days of other months
					str_buffer += '<a href="javascript:window.opener.'+str_target+
					'.value=\''+dateToReturn(dt_current_day)+ /*'\'+document.cal.time.value*/'\'; window.close();" class="calendar">'
				
				str_buffer += dt_current_day.getDate()+'</font></a></td>\n';
				dt_current_day.setDate(dt_current_day.getDate()+1);
		}
		// print row footer
		str_buffer += "</tr>\n";
	}
	// print calendar footer
	str_buffer +=
		'</table>\n' +
		'</tr>\n</td>\n</table>\n' +
		'</body>\n' +
		'</html>\n';

	var vWinCal = window.open("", "Calendar", 
		"width=200,height=150,status=no,resizable=no,top=200,left=200");
	vWinCal.opener = self;
	var calc_doc = vWinCal.document;
	calc_doc.write (str_buffer);
	calc_doc.close();
}
// datetime parsing and formatting routimes. modify them if you wish other datetime format
function str2dt (str_datetime) {
	//var re_date = /^(\d+)\-(\d+)\-(\d+)\s+(\d+)\:(\d+)\:(\d+)$/;
	var re_date = /^(\d+)\.(\d+)\.(\d+)$/;
	if (!re_date.exec(str_datetime))
		return alert("Invalid Datetime format: "+ str_datetime);
	return (new Date (RegExp.$3, RegExp.$2-1, RegExp.$1, RegExp.$4, RegExp.$5, RegExp.$6));
}
function dateToReturn (dt_datetime) {
	var t_day = '';
	var t_month = '';
	var t_year = '';
	
	if(dt_datetime.getDate()<10)
		t_day+='0';
	t_day+=dt_datetime.getDate();
	
	if((dt_datetime.getMonth()+1) < 10)
		t_month+='0';
	t_month+=(dt_datetime.getMonth()+1);
	
	t_year = dt_datetime.getFullYear();
	
	return (new String (t_day+"."+t_month+"."+t_year));
}
function dateToMove (dt_datetime) {
	var t_day = '';
	var t_month = '';
	var t_year = '';
	
	t_day+=dt_datetime.getDate();
	t_month+=(dt_datetime.getMonth()+1);
	t_year = dt_datetime.getFullYear();
	
	return (new String (t_day+"."+t_month+"."+t_year));
}
function dt2tmstr (dt_datetime) {
	return (new String (
			dt_datetime.getHours()+":"+dt_datetime.getMinutes()+":"+dt_datetime.getSeconds()));
}


