// 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 = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"];
    var n_weekstart = 1; // day week starts from (normally 0 or 1)
    if(str_datetime == ''){
    var dt_datetime = new Date();
    }else{
        var dt_datetime = new Date(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"+
    
    "<script> \n"+
    "function hidestatus(){\n"+
    "window.status='' \n"+
    "return true \n"+
    "}"+
    
    "if (document.layers) \n"+
    "document.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT) \n"+
    "document.onmouseover=hidestatus \n"+
    "document.onmouseout=hidestatus \n"+
    "</script> \n" + 
    
    
    "<title>Calendar</title>\n"+
            
    "</head>\n"+
    "<body bgcolor=\"White\">\n"+
    "<table class=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
    "<tr><td bgcolor=\"#4682B4\">\n"+
    "<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
    "<tr>\n	<td bgcolor=\"#4682B4\"><a href=\"javascript:window.opener.show_calendar('"
    +str_target+"', '"+dt2dtstr(dt_prev_month)+"'+document.cal.time.value);\">"+
    "<img src=\"prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
    " alt=\"previous month\"></a></td>\n"+
    "	<td bgcolor=\"#4682B4\" colspan=\"5\">"+
    "<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
    +arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"</font></td>\n"+
    "	<td bgcolor=\"#4682B4\" align=\"right\"><a href=\"javascript:window.opener.show_calendar('"
    +str_target+"', '"+dt2dtstr(dt_next_month)+"'+document.cal.time.value);\">"+
    "<img src=\"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=\"#87CEFA\">"+
        "<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)+"'+document.cal.time.value; 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)+"'+document.cal.time.value; 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 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=200,height=220,status=0,resizable=no,top=200,left=200");
    vWinCal.opener = self;
    vWinCal.status = "";
    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+)\s+(\d+)\:(\d+)\:(\d+)$/;
    //if (!re_date.exec(str_datetime))
        //return alert("Invalid Datetime format: "+ 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.getMonth() + 1)+"/"+(dt_datetime.getDate())+"/"+dt_datetime.getFullYear()+" "));
}
function dt2tmstr(dt_datetime) {
    return (new String(""));  
}

