// 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, target_url, str_datetime, dateonly, divholder) {
	if (!target_url)
		target_url = '';

	if (!dateonly)
		dateonly = false;

	if (!divholder || divholder == '')
		divholder = 'jscalendarholder';

	if (document.getElementById(divholder) && 
		document.getElementById(divholder).style.visibility == 'visible' &&
		!str_datetime) 
	{
		hide_calendar(divholder);
		return;
	}

	if (!str_datetime)
		str_datetime = document.getElementById(target_id).value;
		
	if (dateonly && str_datetime && !str_datetime.match(/:/g))
		str_datetime += ' 12:00:00';
	
	var arr_months = ["January", "February", "March", "April", "May", "June",
		"July", "August", "September", "October", "November", "December"];
	var week_days = ["S", "M", "T", "W", "T", "F", "S"];
	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 cellspacing=\"0\" border=\"0\" id='jscalendar'>\n"+
		"<tr><td>\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\" id='jscalendarheader'>\n"+
		"<tr>\n	<td><a href=\"javascript:show_calendar('"+
			target_id+"', '"+target_url+"', '"+dt2dtstr(dt_prev_month)+
			"'+document.getElementById('jscalendartime').value, "+dateonly+", '"+divholder+"');\">"+
		"&lt;</a></td>\n"+
		"	<td colspan=\"5\">"+
		dt_datetime.getFullYear()+" "+arr_months[dt_datetime.getMonth()]+"</td>\n"+
		"	<td align=\"right\"><a href=\"javascript:show_calendar('"+
			target_id+"', '"+target_url+"', '"+dt2dtstr(dt_next_month)+
			"'+document.getElementById('jscalendartime').value, "+dateonly+", '"+divholder+"');\">"+
		"&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 id='jscalendarweekdays'>"+
		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 id='jscalendartoday' align=\"right\">";
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += "	<td id='jscalendarweekend' align=\"right\">";
				else
					// print working days of current month
					str_buffer += "	<td id='jscalendarday' align=\"right\">";

				if (dt_current_day.getMonth() == dt_datetime.getMonth()) {
					// print days of current month
					str_buffer += 
						"<a href=\"javascript:set_calendar('"+
							target_id+"', '"+target_url+"', ";
						
					if (dateonly) {
						str_buffer += 
							"'"+dt2dtstr(dt_current_day).replace(/^\s+|\s+$/g,'')+"');\">";
					} else {
						str_buffer += 
							"'"+dt2dtstr(dt_current_day)+"'+document.getElementById('jscalendartime').value);\">";
					}
					
					str_buffer += 
						"<span>";
						
				} else { 
					// print days of other months
					str_buffer += 
						"<a href=\"javascript:set_calendar('"+
							target_id+"', '"+target_url+"', ";
					
					if (dateonly) {
						str_buffer += 
							"'"+dt2dtstr(dt_current_day)+"');\">";
					} else {
						str_buffer += 
							"'"+dt2dtstr(dt_current_day)+"'+document.getElementById('jscalendartime').value);\">";
					}
					
					str_buffer += 
						"<span id='jscalendardayothermonth'>";
				}
				
				str_buffer += dt_current_day.getDate()+"</span></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";
		
	if (dateonly) {
		str_buffer +=
			"<input type=\"hidden\" id=\"jscalendartime\" value=\""+dt2tmstr(dt_datetime)+
			"\" size=\"8\" maxlength=\"8\">\n";
	} else {
		str_buffer +=
			"&nbsp; &nbsp; Time: <input type=\"text\" id=\"jscalendartime\" value=\""+dt2tmstr(dt_datetime)+
			"\" size=\"8\" maxlength=\"8\">\n";
	}
	
	str_buffer +=
		"</td>\n</tr>\n</table>\n" +
		"<a href='javascript:hide_calendar();' id='jscalendarhide'></a>";

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

function hide_calendar(divholder) {
	if (!divholder || divholder == '')
		divholder = 'jscalendarholder';

	document.getElementById(divholder).style.visibility = 'hidden';
	document.getElementById(divholder).innerHTML = '';
	document.getElementById(divholder).style.left = 0;
	document.getElementById(divholder).style.top = 0;
}

function set_calendar(target_id, target_url, value) {
	if (target_id != '') {
		document.getElementById(target_id).value=value; 
		hide_calendar();
	}
	
	if (target_url != '') {
		window.location = target_url+value;
	}
}

function clear_Date(divholder) {
	document.getElementById(divholder).value='';
}

// 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()));
}