// 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

/*
original colors:

White - #ffffff
#4682B4
#87CEFA
#FFB6C1
#DBEAF5
black - #000000
gray - #888888


colors used:

#ffffff
#C61E1E
#E36464
#FDEF7C
#F9DCDC
#C61E1E
#E36464



*/

function get_style_text()
{

    var style_str = "\n";
    style_str+="<style type=\"text/css\">\n";
    style_str+="body\n";
    style_str+="{\n";
    style_str+="    background: #ffffff;\n";
    style_str+="	font-family: \"Helvetica Neue\", Arial, Helvetica, \"Nimbus Sans L\", sans-serif;\n";
    style_str+="    font-size: 10px;\n";
    style_str+="}\n";
    style_str+="\n";
    style_str+="a\n";
    style_str+="{\n";
    style_str+="    text-decoration: none;\n";
    style_str+="}\n";
    style_str+="\n";
    style_str+="table\n";
    style_str+="{\n";
    style_str+="    border-collapse:collapse;\n";
    style_str+="}\n";
    style_str+="\n";
    style_str+="a.dateA:link, a.dateA:visited, a.dateA:hover, a.dateA:active\n";
    style_str+="{\n";
    style_str+="    color: #C61E1E;\n"; //#000000
    style_str+="}\n";
    style_str+="\n";
    style_str+="a.dateB:link, a.dateB:visited, a.dateB:hover, a.dateB:active\n";
    style_str+="{\n";
    style_str+="    color: #E36464;\n"; //#888888
    style_str+="}\n";
    style_str+="\n";
    style_str+="a.arrows:link, a.arrows:visited, a.arrows:hover, a.arrows:active\n";
    style_str+="{\n";
    style_str+="    color: #ffffff;\n";
    style_str+="}\n";
    style_str+="\n";
    style_str+="td.mainCell\n";
    style_str+="{\n";
    style_str+="    background: #C61E1E;\n"; //#4682B4
    style_str+="    text-align: center;\n";
    style_str+="    font-size: 13px;\n";
    style_str+="    color: #ffffff;\n";
    style_str+="}\n";
    style_str+="td.headCell\n";
    style_str+="{\n";
    style_str+="    background: #E36464;\n"; //#87CEFA
    style_str+="    text-align: center;\n";
    style_str+="    font-size: 12px;\n";
    style_str+="    color: #ffffff;\n";
    style_str+="}\n";
    style_str+="td.weekend\n";
    style_str+="{\n";
    style_str+="    background: #F9DCDC;\n"; //#DBEAF5
    style_str+="    text-align: center;\n";
    style_str+="    font-size: 10px;\n";
    style_str+="}\n";
    style_str+="td.weekday\n";
    style_str+="{\n";
    style_str+="    background: #ffffff;\n";
    style_str+="    text-align: center;\n";
    style_str+="    font-size: 10px;\n";
    style_str+="}\n";
    style_str+="\n";
    style_str+="td.activeday\n";
    style_str+="{\n";
    style_str+="    background: #FDEF7C;\n"; //#FFB6C1
    style_str+="    text-align: center;\n";
    style_str+="    font-size: 10px;\n";
    style_str+="}\n";
    style_str+="\n";
    style_str+="</style>\n\n";
    
    return style_str;

}



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 = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"];
	var n_weekstart = 0; // 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_prev_year = new Date(dt_datetime);
	dt_prev_year.setFullYear(dt_datetime.getFullYear()-1);
	var dt_next_year = new Date(dt_datetime);
	dt_next_year.setFullYear(dt_datetime.getFullYear()+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"+get_style_text()+
		"</head>\n"+
		"<body>\n"+
		"<table cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
		"<tr><td class=\"mainCell\">\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td class=\"mainCell\" colspan=\"7\" align=\"center\">"+
		"<a class=\"arrows\" href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_year)+"');\">"+
		"&lt;&lt;</a>&nbsp;"+
		"&nbsp;&nbsp;<a class=\"arrows\" href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_month)+"');\">"+
		"&lt;</a>"+
		"&nbsp;&nbsp;"+arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"\n"+
		"&nbsp;&nbsp;<a class=\"arrows\" href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_next_month)+"');\">"+
		"&gt;</a>&nbsp;"+
		"&nbsp;&nbsp;<a class=\"arrows\" href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_next_year)+"'); \">"+
		"&gt;&gt;</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=\"headCell\">"+
		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=\"activeday\">";
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += "	<td class=\"weekend\">";
				else
					// print working days of current month
					str_buffer += "	<td class=\"weekday\">";

				if (dt_current_day.getMonth() == dt_datetime.getMonth())
					// print days of current month
					str_buffer += "<a class=\"dateA\" href=\"javascript:window.opener."+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'; window.close();\">";
				else 
					// print days of other months
					str_buffer += "<a class=\"dateB\" href=\"javascript:window.opener."+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'; window.close();\">";
				str_buffer += dt_current_day.getDate()+"</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=200,status=no,resizable=yes,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 = /^\s*(\d+)\-(\d+)\-(\d+)\s*$/;
	if (!re_date.exec(str_datetime))
		return alert("Invalid Datetime format: "+ str_datetime);
	return (new Date (RegExp.$3, RegExp.$1-1, RegExp.$2, 0, 0, 0)); // year, month, day, hours, minutes, seconds, milliseconds
}
function dt2dtstr (dt_datetime) 
{
    var dt_date_str = dt_datetime.getDate();
    var dt_month_str = dt_datetime.getMonth()+1;
    var dt_year_str = dt_datetime.getFullYear();
    
    if( dt_date_str < 10 )
    {
        dt_date_str = "0" + dt_date_str;
    }
    if( dt_month_str < 10 )
    {
        dt_month_str = "0" + dt_month_str;
    }
    return (new String (dt_month_str+"-"+dt_date_str+"-"+dt_year_str));
}