

// 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 aMonths = new Array("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
var aaMonths = new Array;
set_months();

function set_months()
{
	var i;
	for (i=0; i<aMonths.length; i++)
		aaMonths[aMonths[i]] = i;
}
function ValidateDate(oTxt, sPrefix)
{
	var val;
	val = oTxt.value;
	if (val=="") return;
	val = val.replace(/-/gi, " ");
	var d = new Date(val);
    if (isNaN(d.getDate()))
	{
		alert("Dates must be of the form 17-Jul-2002.  You can choose the date by clicking on the calendar icon to the right of the input box.");
		return false;
	}
	if (d.getFullYear()<1950)
	{
		alert("Please enter a 4-year date.");
		return false;
	}
	var sFld;
	eval(sPrefix+"_day.value=d.getDate()");
	eval(sPrefix+"_month.value=d.getMonth()");
	eval(sPrefix+"_year.value=d.getFullYear()");
	eval(sPrefix+"DateA.value='"+d.getDate()+"-"+aMonths[d.getMonth()]+"-"+d.getFullYear()+"'");
	DateWasSet(sPrefix);
	
}
function show_calendar(str_short_target, str_datetime) {
	var str_target = str_short_target + "DateA";
    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_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_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"+
		"</head>\n"+
		"<body bgcolor=\"#EEECE8\">\n"+
		"<table cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n<td bgcolor=\"#315C80\">\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td bgcolor=\"#315C80\" colspan=\"2\">"+
		"<a href=\"javascript:window.opener.show_calendar('" +
		str_short_target+"', '"+ dt2dtstr(dt_prev_month)+"');\">" +
		"<img src=\"js/prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
		" alt=\"previous month\"></a>" +
		"</td>\n"+
		"	<td bgcolor=\"#315C80\" colspan=\"3\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
		+arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"</font></td>\n"+
		"	<td bgcolor=\"#315C80\" align=\"right\"  colspan=\"2\"><a href=\"javascript:window.opener.show_calendar('"
		+str_short_target+"', '"+dt2dtstr(dt_next_month)+"');\">"+
		"<img src=\"js/next.gif\" width=\"16\" height=\"16\" 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 bgcolor=\"#1F3A52\">"+
		"<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.opener."+
					str_short_target+"_day.value='" + dt_current_day.getDate() + "'; " + 
					"window.opener." + str_short_target + "_month.value='" + dt_current_day.getMonth() + "'; " +
					"window.opener." + str_short_target + "_year.value='" + dt_current_day.getFullYear() + "'; " +
					"window.opener.DateWasSet('" + str_short_target + "'); 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.opener."+
					str_short_target+"_day.value='" + dt_current_day.getDate() + "'; " + 
					"window.opener." + str_short_target + "_month.value='" + dt_current_day.getMonth() + "'; " +
					"window.opener." + str_short_target + "_year.value='" + dt_current_day.getFullYear() + "'; " +
					"window.opener.DateWasSet('" + str_short_target + "'); 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 +=
		"<form name=\"cal\">\n<tr><td align=\"center\" colspan=\"7\" bgcolor=\"#315C80\">"+
		"<font color=\"White\" face=\"tahoma, verdana\" size=\"2\">"+
		"Quality Inn Sudbury </font></td></tr>\n</form>\n" +
		"</table>\n" +
		"</tr>\n</td>\n</table>\n" +
		"</body>\n" +
		"</html>\n";

	var vWinCal = window.open("", "Calendar", 
		"width=235,height=260,status=0,resizable=1,location=0,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 aDate;
	aDate = str_datetime.split("-");
	return (new Date(aDate[2], aaMonths[aDate[1]], aDate[0]));
}
function dt2dtstr (dt_datetime) {
	return (new String (
			dt_datetime.getDate()+"-"+(aMonths[dt_datetime.getMonth()])+"-"+dt_datetime.getFullYear()+" "));
}
function dt2tmstr (dt_datetime) {
	return (new String (""));
}

//need a javascript function to stop alpha values or negative values where positive numeric values should be entered.
function check_number(sNum) {
   if(isNaN(sNum)) {
      alert('Please enter a numeric value');
      return false;
   } else {
      if(sNum < 0) {
         alert('Please enter a value greater than zero');
         return false;
      }
   }
}

