// 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

var currentLanguage = "eng";

function show_calendar(str_target, str_datetime, language) {
	var arr_months;
	var week_days;

	switch (language) { 
		case "arm" :
			arr_months = ["&#1344;&#1400;&#1410;&#1398;&#1406;&#1377;&#1408;", "&#1363;&#1381;&#1407;&#1408;&#1406;&#1377;&#1408;", "&#1348;&#1377;&#1408;&#1407;", "&#1329;&#1402;&#1408;&#1387;&#1388;", "&#1348;&#1377;&#1397;&#1387;&#1405;", "&#1344;&#1400;&#1410;&#1398;&#1387;&#1405;",	"&#1344;&#1400;&#1410;&#1388;&#1387;&#1405;", "&#1365;&#1379;&#1400;&#1405;&#1407;&#1400;&#1405;", "&#1357;&#1381;&#1402;&#1407;&#1381;&#1396;&#1378;&#1381;&#1408;", "&#1344;&#1400;&#1391;&#1407;&#1381;&#1396;&#1378;&#1381;&#1408;", "&#1350;&#1400;&#1397;&#1381;&#1396;&#1378;&#1381;&#1408;", "&#1332;&#1381;&#1391;&#1407;&#1381;&#1396;&#1378;&#1381;&#1408;"];
			week_days  = ["&#1343;&#1387;&#1408;", "&#1333;&#1408;&#1391;", "&#1333;&#1408;&#1412;", "&#1353;&#1408;&#1412;", "&#1344;&#1398;&#1379;", "&#1352;&#1410;&#1408;&#1378;", "&#1351;&#1378;&#1385;"];
	
			currentLanguage = "arm";	
			break;

		case "rus" :
			arr_months = ["&#1071;&#1085;&#1074;&#1072;&#1088;&#1100;", "&#1060;&#1077;&#1074;&#1088;&#1072;&#1083;&#1100;", "&#1052;&#1072;&#1088;&#1090;", "&#1040;&#1087;&#1088;&#1077;&#1083;&#1100;", "&#1052;&#1072;&#1081;", "&#1048;&#1102;&#1085;&#1100;",	"&#1048;&#1102;&#1083;&#1100;", "&#1040;&#1074;&#1075;&#1091;&#1089;&#1090;", "&#1057;&#1077;&#1085;&#1090;&#1103;&#1073;&#1088;&#1100;", "&#1054;&#1082;&#1090;&#1103;&#1073;&#1088;&#1100;", "&#1053;&#1086;&#1103;&#1073;&#1088;&#1100;", "&#1044;&#1077;&#1082;&#1072;&#1073;&#1088;&#1100;"];
			week_days  = ["&#1042;&#1089;", "&#1055;&#1085;", "&#1042;&#1090;", "&#1057;&#1088;", "&#1063;&#1090;", "&#1055;&#1090;", "&#1057;&#1073;"];
			
			currentLanguage = "rus";
			break;

		default :
			arr_months = ["January", "February", "March", "April", "May", "June",	"July", "August", "September", "October", "November", "December"];
			week_days  = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"];
		
			currentLanguage = "eng";
	} 

	var n_weekstart = 1; // day week starts from (normally 0 or 1)

	var dt_current = new Array("", new Date());
	var dt_datetime = (str_datetime == null || str_datetime =="" ?  dt_current : str2dt(str_datetime));
	var dt_error = dt_datetime;
	dt_datetime = dt_datetime[1];
	var dt_prev_month = new Date(dt_datetime);
	dt_prev_month.setMonth(dt_datetime.getMonth()-1);
	var dt_prev_year = new Date(dt_datetime);
	dt_prev_year.setYear(dt_datetime.getYear()-1);
	var dt_prev_year10 = new Date(dt_datetime);
	dt_prev_year10.setYear(dt_datetime.getYear()-10);
	
	var dt_next_month = new Date(dt_datetime);
	dt_next_month.setMonth(dt_datetime.getMonth()+1);
	var dt_next_year = new Date(dt_datetime);
	dt_next_year.setYear(dt_datetime.getYear()+1);
	var dt_next_year10 = new Date(dt_datetime);
	dt_next_year10.setYear(dt_datetime.getYear()+10);
	
	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"+
		"</head>\n"+
		"<body bgcolor=\"White\">\n"+
		"<table class=\"\" cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
		"<tr><td bgcolor=\"#4682B4\">\n"+
		"<table cellspacing=\"1\" cellpadding=\"2\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n"+
		"	<td bgcolor=\"#4682B4\" colspan=\"4\" align=\"right\">\n"+
		"		<table cellspacing=\"0\" cellpadding=\"0\" border=\"0\">\n"+
		"			<tr>\n"+
		"				<td valign=\"middle\">\n"+
		"					<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"+arr_months[dt_datetime.getMonth()]+"</font>\n"+
		"				</td>\n"+
		"				<td>\n"+
		"					<table cellspacing=\"0\" cellpadding=\"1\" border=\"0\">\n"+
		"						<tr>\n"+
		"							<td align=\"right\"><font color=\"white\" face=\"tahoma, verdana\" size=\"1\">&nbsp;</font></td>\n"+
		"							<td><a href=\"javascript:window.opener.show_calendar('"+str_target+"', '"+dt2dtstr(dt_next_month)+"', '"+currentLanguage+"');\">"+
											"<img src=\"images/cal_next_v.gif\" width=\"10\" height=\"10\" border=\"0\" alt=\"next month\"></a></td>\n"+
		"						</tr>\n"+
		"						<tr>\n"+
		"							<td align=\"right\"><font color=\"white\" face=\"tahoma, verdana\" size=\"1\">&nbsp;</font></td>\n"+
		"							<td><a href=\"javascript:window.opener.show_calendar('"+str_target+"', '"+dt2dtstr(dt_prev_month)+"', '"+currentLanguage+"');\">"+
											"<img src=\"images/cal_prev_v.gif\" width=\"10\" height=\"10\" border=\"0\" alt=\"previous month\"></a></td>\n"+
		"						</tr>\n"+
		"					</table>\n"+
		"				</td>\n"+
		"			</tr>\n"+
		"		</table>\n"+
		"	</td>\n"+
		"	<td bgcolor=\"#4682B4\" colspan=\"3\" align=\"right\">\n"+
		"		<table cellspacing=\"0\" cellpadding=\"0\" border=\"0\">\n"+
		"			<tr>\n"+
		"				<td valign=\"middle\">\n"+
		"					<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"+dt_datetime.getFullYear()+"</font>\n"+
		"				</td>\n"+
		"				<td>\n"+
		"					<table cellspacing=\"0\" cellpadding=\"1\" border=\"0\">\n"+
		"						<tr>\n"+
		"							<td><a href=\"javascript:window.opener.show_calendar('"+str_target+"', '"+dt2dtstr(dt_next_year)+"', '"+currentLanguage+"');\">"+
											"<img src=\"images/cal_next_v.gif\" width=\"10\" height=\"10\" border=\"0\" alt=\"next year\"></a></td>\n"+
		"							<td align=\"right\"><font color=\"white\" face=\"tahoma, verdana\" size=\"1\">&nbsp;</font></td>\n"+
		"						</tr>\n"+
		"						<tr>\n"+
		"							<td><a href=\"javascript:window.opener.show_calendar('"+str_target+"', '"+dt2dtstr(dt_prev_year)+"', '"+currentLanguage+"');\">"+
											"<img src=\"images/cal_prev_v.gif\" width=\"10\" height=\"10\" border=\"0\" alt=\"previous year\"></a></td>\n"+
		"							<td align=\"right\"><font color=\"white\" face=\"tahoma, verdana\" size=\"1\">&nbsp;</font></td>\n"+
		"						</tr>\n"+
		"					</table>\n"+
		"				</td>\n"+
		"				<td>\n"+
		"					<table cellspacing=\"0\" cellpadding=\"1\" border=\"0\">\n"+
		"						<tr>\n"+
		"							<td align=\"right\"><font color=\"white\" face=\"tahoma, verdana\" size=\"1\">+10</font></td>\n"+
		"							<td><a href=\"javascript:window.opener.show_calendar('"+str_target+"', '"+dt2dtstr(dt_next_year10)+"', '"+currentLanguage+"');\">"+
										"<img src=\"images/cal_next_v.gif\" width=\"10\" height=\"10\" border=\"0\" alt=\"next 10 year\"></a></td>\n"+
		"						</tr>\n"+
		"						<tr>\n"+
		"							<td align=\"right\"><font color=\"white\" face=\"tahoma, verdana\" size=\"1\">-10</font></td>\n"+
		"							<td><a href=\"javascript:window.opener.show_calendar('"+str_target+"', '"+dt2dtstr(dt_prev_year10)+"', '"+currentLanguage+"');\">"+
										"<img src=\"images/cal_prev_v.gif\" width=\"10\" height=\"10\" border=\"0\" alt=\"previous 10 year\"></a></td>\n"+
		"						</tr>\n"+
		"					</table>\n"+
		"				</td>\n"+
		"			</tr>\n"+
		"		</table>\n"+
		"	</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\" align=\"center\" width=\"\">"+
		"<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=\"#FFB6C1\" 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='"+dt2dtstr(dt_current_day)+"'; window.close();\">"+
					"<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
				else 
					// print days of other months
					str_buffer += "<a href=\"javascript:window.opener."+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'; window.close();\">"+
					"<font color=\"gray\" face=\"tahoma, verdana\" size=\"2\">";
				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=250,height=210,status=no,resizable=no,top=250,left=300");
	vWinCal.opener = self;
	vWinCal.focus();
	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_date) {
	var rv = new Array("", new Date());

	var datePat = /^(\d{1,2})(\/|-|.)(\d{1,2})\2(\d{4})$/;
	var matchArray = str_date.match(datePat);
	if (matchArray == null) 
		return rv;

	day   = matchArray[1];
	month = matchArray[3];
	year  = matchArray[4];

	if (month < 1 || month > 12) {
		rv[0] = "Month must be between 1 and 12.";
		return rv; 
		}
	if (day < 1 || day > 31) {
		rv[0] = "Day must be between 1 and 31.";
		return rv; 
		}
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		rv[0] = "Month "+month+" doesn't have 31 days!";
		return rv;
		}
	if (month == 2) {
			var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
			if (day>29 || (day==29 && !isleap)) {
				rv[0] = "February " + year + " doesn't have " + day + " days!";
				return rv;
			}
		}

	rv[1] = new Date (year, month-1, day, 0, 0, 0);
	return rv;
}
function dt2dtstr (dt_datetime) {
    var separator = "/";
	return (new String (
			dt_datetime.getDate()+separator+(dt_datetime.getMonth()+1)+separator+dt_datetime.getFullYear()+""));
}
function dt2tmstr (dt_datetime) {
	return (new String (
			dt_datetime.getHours()+":"+dt_datetime.getMinutes()+":"+dt_datetime.getSeconds()));
}
