// 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) {
	var arr_months = ["January", "February", "March", "April", "May", "June",
		"July", "August", "September", "October", "November", "December"];
	var week_days = ["Sun", "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat"];
	var n_weekstart = 1; // day week starts from (normally 0 or 1)


//	var dt_datetime =

	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" +
		"	body{\n"+
		"		margin:5px\n"+
		"	}\n"+
		"		TD.Calendar {\n" +
		"			width: 20px;\n" +
		"			height: 20px;\n" +
		"			text-align: center;\n" +
		"			vertical-align: middle;\n" +
		"		}\n" +
		"		TD.WeekDay {\n" +
		"			color: #00AFEF;\n" +
		"			font-style: Italic;\n" +
		"			font-weight: Bold;\n" +
		"			font-family: Arial;\n" +
		"			font-size: 11px;\n" +
		"		}\n" +
		"		TD.WeekendDay {\n" +
		"			background-color: #cbf2ff\n" +
		"		}\n" +
		"		TD.CurrentDay {\n" +
		"			border: solid 1px #000000;\n" +
		"			background-color: #cbcbcb;\n" +
		"		}\n" +
		"		.TableHeader {\n" +
//		"			background-image: url( framework/layout/images/Canvas_TableHeaderBg.gif );\n" +
		"			background-repeat: repeat-x;\n" +
		"			background-position: bottom left;\n" +
		"			background-color: #DEDBDE;\n" +
		"			padding: 3px 5px;\n" +
		"			font-family: Arial;\n" +
		"			font-size: 10px;\n" +
		"			color: #000000;\n" +
		"			font-weight: Bold;\n" +
		"			vertical-align: bottom;\n" +
		"		}\n" +
		"		A {" +
		"			text-decoration: none;" +
		"		}" +
		"	</style>\n" +
		"</head>\n"+
		"<body bgcolor=\"White\">\n"+
		"<table cellspacing=\"0\" border=\"0\" width=\"95%\" align=\"center\">\n"+
		"<tr><td>\n"+
		"<table cellspacing=\"0\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr class=\"TableHeader\">\n	<td><a href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_month)+"');\">"+
		"<img src=\"images/agenda_picker_arrowleft.gif\" border=\"0\""+
		" alt=\"previous month\"></a></td>\n"+
		"	<td colspan=\"5\" style=\"font-family: Arial; font-size: 10px; color: Black\">"+
		arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"</font></td>\n"+
		"	<td><a href=\"javascript:window.opener.show_calendar('"+
				str_target+"', '"+ dt2dtstr(new Date())+"');\">today</a></td>\n"+
		"	<td align=\"right\"><a href=\"javascript:window.opener.show_calendar('"
		+str_target+"', '"+dt2dtstr(dt_next_month)+"');\">"+
		"<img src=\"images/agenda_picker_arrowright.gif\" 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 class=\"WeekDay\" align=\"right\">"+
		week_days[(n_weekstart+n)%7]+"</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 class=\"Calendar CurrentDay\" align=\"right\">";
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += "	<td class=\"Calendar WeekendDay\" align=\"right\">";
				else
					// print working days of current month
					str_buffer += "	<td class=\"Calendar\" align=\"right\">";

				if (dt_current_day.getMonth() == dt_datetime.getMonth())
					// print days of current month
/*					str_buffer += "<a href=\"javascript:window.opener.document.getElementById('"+str_target+"_year').value='"+dt_current_day.getFullYear()+"';" +
											"javascript:window.opener.document.getElementById('"+str_target+"_month').value='"+(dt_datetime.getMonth() + 1)+"';" +
											"javascript:window.opener.document.getElementById('"+str_target+"_day').value='"+dt_current_day.getDate()+"';" +
											"javascript:window.close();"+"\">"+
*/
					str_buffer += "<a href=\"javascript:window.opener.document.getElementById('"+str_target+"').value='" +
											dt_current_day.getDate() + "-" + (dt_datetime.getMonth() + 1) + "-" + dt_current_day.getFullYear() + "';" +
											"javascript:window.close();javascript:window.opener.document.getElementById('"+str_target+"').focus();"+"\">"+

					"<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
				else
					// print days of other months
/*					str_buffer += "<a href=\"javascript:window.opener.document.getElementById('"+str_target+"_year').value='"+dt_current_day.getFullYear()+"';" +
											"javascript:window.opener.document.getElementById('"+str_target+"_month').value='"+(dt_current_day.getMonth() + 1)+"';" +
											"javascript:window.opener.document.getElementById('"+str_target+"_day').value='"+dt_current_day.getDate()+"';" +
											"javascript:window.close();"+"\">"+
*/
					str_buffer += "<a href=\"javascript:window.opener.document.getElementById('"+str_target+"').value='"+
											dt_current_day.getDate() + "-" + (dt_datetime.getMonth() + 1) + "-" + dt_current_day.getFullYear()+"';" +
											"javascript:window.close();javascript:window.opener.document.getElementById('"+str_target+"').focus();"+"\">"+

					"<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);
		}
//				alert(str_buffer);
		// print row footer
		str_buffer += "</tr>\n";
	}
	// print calendar footer
	/*str_buffer +=
		"<form name=\"cal\">\n<tr><td colspan=\"7\" bgcolor=\"#87CEFA\">"+
		"<font color=\"White\" face=\"tahoma, verdana\" size=\"2\">"+
		"Time: <input type=\"text\" name=\"time\" value=\""+dt2tmstr(dt_datetime)+
		"\" size=\"8\" maxlength=\"8\"></font></td></tr>\n</form>\n" +
		"</table>\n" +
		"</tr>\n</td>\n</table>\n" +
		"</body>\n" +
		"</html>\n";

	*/

	var vWinCal = window.open("", "Calendar",
		"width=250,height=160,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+).*$/; //+(\d+)\:(\d+)\:(\d+)$/;
	var re_date_noyear = /^(\d+)\-(\d+).*$/;
	var today = new Date();
	var year = today.getFullYear();

	if (!re_date.exec(str_datetime)) {
		if (re_date_noyear.exec(str_datetime))
			str_datetime = str_datetime + "-" + year;
		else
			return alert("Invalid Datetime format: "+ str_datetime + "!");
	}
	re_date.exec(str_datetime);
	return (new Date (RegExp.$3, RegExp.$2-1, RegExp.$1, RegExp.$4, RegExp.$5, RegExp.$6));
}
function dt2dtstr (dt_datetime) {
	return (new String (
			dt_datetime.getDate()+"-"+(dt_datetime.getMonth()+1)+"-"+dt_datetime.getFullYear()+" "));
}
function dt2tmstr (dt_datetime) {
	return (new String (
			dt_datetime.getHours()+":"+dt_datetime.getMinutes()+":"+dt_datetime.getSeconds()));
}

