// 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
//
// Changes to have it in div and hide timestamp and so on by
// Julius <me@pijulius.com>

function show_calendar(target_id, str_datetime) {
	if (document.getElementById('jscalendarholder').style.visibility == 'visible' &&
		!str_datetime) 
	{
		hide_calendar();
		return;
	}

	if (!str_datetime)
		str_datetime = document.getElementById(target_id).value;
	
	// str_datetime format accepted: YYYY-MM-DD HH:II:SS
	if (str_datetime) {
		//str_datetime = str_datetime.replace(/\./g, '-');
		str_datetime = str_datetime+' ';
		str_datetime = str_datetime.substr(0, str_datetime.indexOf(' ')) + ' 00:01:00';
	}
	
	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 (
		"<table class=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"100%\" bgcolor='#556E96'>\n"+
		"<tr><td>\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td><a href=\"javascript:show_calendar('"+
			target_id+"', '"+dt2dtstr(dt_prev_month)+
			"'+document.getElementById('jscalendartime').value);\" "+
			"style='text-decoration: none; color: #FFFFFF; font-size: 10px;'>"+
		"&lt;</a></td>\n"+
		"	<td colspan=\"5\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
		+arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"</font></td>\n"+
		"	<td align=\"right\"><a href=\"javascript:show_calendar('"+
			target_id+"', '"+dt2dtstr(dt_next_month)+
			"'+document.getElementById('jscalendartime').value);\" "+
			"style='text-decoration: none; color: #FFFFFF; font-size: 10px;'>"+
		"&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 bgcolor=\"#657EA6\">"+
		"<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:document.getElementById('"+target_id+"')"+
					".value='"+dt2dtstr(dt_current_day)+"'; hide_calendar();\">"+
					"<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
				else 
					// print days of other months
					str_buffer += "<a href=\"javascript:document.getElementById('"+target_id+"')"+
					".value='"+dt2dtstr(dt_current_day)+"'; hide_calendar();\">"+
					"<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" +
		"<a href='javascript:hide_calendar();' id='jscalendarhide'></a>"+
		"<input type=\"hidden\" id=\"jscalendartime\" value=\""+dt2tmstr(dt_datetime)+
		"\" size=\"8\" maxlength=\"8\">\n";

	document.getElementById('jscalendarholder').innerHTML = str_buffer;
	
	if (document.getElementById('jscalendarholder').style.visibility != 'visible') {
		document.getElementById('jscalendarholder').style.visibility = 'visible';
		document.getElementById('jscalendarholder').style.left = mouseX-100;
		document.getElementById('jscalendarholder').style.top = mouseY+10;
	}
}

function hide_calendar() {
	document.getElementById('jscalendarholder').style.visibility = 'hidden';
	document.getElementById('jscalendarholder').innerHTML = '';
	document.getElementById('jscalendarholder').style.left = 0;
	document.getElementById('jscalendarholder').style.top = 0;
}

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