/***********************************************************************
 Funtion name: isValidDate
 Description: Checks for the following valid date formats:
 DD/MM/YYYY -> day = matchArray[1]; month = matchArray[3];
 MM/DD/YYYY -> day = matchArray[3]; month = matchArray[1];
 Return: True or False
************************************************************************/
function isValidDate(inputObject)
{
    dateStr = trim(inputObject.value);
    var datePat = /^(\d{1,2})(\/)(\d{1,2})(\/)(\d{4})$/;
    var matchArray = dateStr.match(datePat); // is the format ok?
    if (matchArray == null)
    {
        return false;
    }
    day = matchArray[1];
    month = matchArray[3];
    year = matchArray[5];

    if (month < 1 || month > 12)
    {
        return false;
    }
    if (day < 1 || day > 31)
    {
        return false;
    }
    if ((month==4 || month==6 || month==9 || month==11) && day==31)
    {
        return false
    }
    if (month == 2)
    {
        var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
        var dayOfFeb = 28;
        if (isleap)
            dayOfFeb = 29;
        if (day>29 || (day==29 && !isleap))
        {
            return false;
        }
    }
    if (year <1753)
    {
        return false;
    }
    return true;
}

function getCurrentTime(time)
{
    monthnames = new Array("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "Decemeber");
    todayDate = new Date();
    thismonth = todayDate.getMonth();

    thisday=todayDate.getDay();
    thisdate=todayDate.getDate();
    thisyear=todayDate.getYear();
    thisyear = thisyear % 100;
    thisyear = ((thisyear < 50) ? (2000 + thisyear) : (1900 + thisyear));

    switch (time)
    {
        case 1: return thisyear;
        case 2: return monthnames[thismonth];
        case 3: return thisdate;
        case 4: return thisday
    }
}


// Utility functions for parsing in getDateFromFormat()
// ------------------------------------------------------------------
function _isInteger(val) {
    var digits="1234567890";
    for (var i=0; i < val.length; i++) {
        if (digits.indexOf(val.charAt(i))==-1) { return false; }
        }
    return true;
}

function _getInt(str,i,minlength,maxlength) {
    for (var x=maxlength; x>=minlength; x--) {
        var token=str.substring(i,i+x);
        if (token.length < minlength) { return null; }
        if (_isInteger(token)) { return token; }
        }
    return null;
}
// ------------------------------------------------------------------

// compareDates(date1,date2)
//   Compare two date strings to see which is greater.
//   Returns:
//   1 if date1 is greater than date2
//   0 if date2 is greater than date1 of if they are the same
//  -1 if either of the dates is in an invalid format
// ------------------------------------------------------------------
function compareDates(date1, date2) {
    var dateformat = "dd/mm/yyyy";
    var d1=getDateFromFormat(date1,dateformat);
    var d2=getDateFromFormat(date2,dateformat);

    if (d1==0 || d2==0) {
        return -1;
        }
    else if (d1 > d2) {
        return 1;
        }
    return 0;
}
// ------------------------------------------------------------------

// getDateFromFormat( date_string , format_string )
//
// This function takes a date string and a format string. It matches
// If the date string matches the format string, it returns the
// getTime() of the date. If it does not match, it returns 0.
// ------------------------------------------------------------------
function getDateFromFormat(val,format) {
    var MONTH_NAMES=new Array('January','February','March','April','May','June','July','August','September','October','November','December','Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');
    var DAY_NAMES=new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sun','Mon','Tue','Wed','Thu','Fri','Sat');

    val=val+"";
    format=format+"";
    var i_val=0;
    var i_format=0;
    var c="";
    var token="";
    var token2="";
    var x,y;
    var now=new Date();
    var year=now.getYear();
    var month=now.getMonth()+1;
    var date=1;
    var hh=now.getHours();
    var mm=now.getMinutes();
    var ss=now.getSeconds();
    var ampm="";

    while (i_format < format.length) {
        // Get next token from format string
        c=format.charAt(i_format);
        token="";
        while ((format.charAt(i_format)==c) && (i_format < format.length)) {
            token += format.charAt(i_format++);
            }
        // Extract contents of value based on format token
        if (token=="yyyy" || token=="yy" || token=="y") {
            if (token=="yyyy") { x=4;y=4; }
            if (token=="yy")   { x=2;y=2; }
            if (token=="y")    { x=2;y=4; }
            year=_getInt(val,i_val,x,y);
            if (year==null) { return 0; }
            i_val += year.length;
            if (year.length==2) {
                if (year > 70) { year=1900+(year-0); }
                else { year=2000+(year-0); }
                }
            }
        else if (token=="MMM"||token=="NNN"){
            month=0;
            for (var i=0; i<MONTH_NAMES.length; i++) {
                var month_name=MONTH_NAMES[i];
                if (val.substring(i_val,i_val+month_name.length).toLowerCase()==month_name.toLowerCase()) {
                    if (token=="MMM"||(token=="NNN"&&i>11)) {
                        month=i+1;
                        if (month>12) { month -= 12; }
                        i_val += month_name.length;
                        break;
                        }
                    }
                }
            if ((month < 1)||(month>12)){return 0;}
            }
        else if (token=="EE"||token=="E"){
            for (var i=0; i<DAY_NAMES.length; i++) {
                var day_name=DAY_NAMES[i];
                if (val.substring(i_val,i_val+day_name.length).toLowerCase()==day_name.toLowerCase()) {
                    i_val += day_name.length;
                    break;
                    }
                }
            }
        else if (token=="MM"||token=="M") {
            month=_getInt(val,i_val,token.length,2);
            if(month==null||(month<1)||(month>12)){return 0;}
            i_val+=month.length;}
        else if (token=="dd"||token=="d") {
            date=_getInt(val,i_val,token.length,2);
            if(date==null||(date<1)||(date>31)){return 0;}
            i_val+=date.length;}
        else if (token=="hh"||token=="h") {
            hh=_getInt(val,i_val,token.length,2);
            if(hh==null||(hh<1)||(hh>12)){return 0;}
            i_val+=hh.length;}
        else if (token=="HH"||token=="H") {
            hh=_getInt(val,i_val,token.length,2);
            if(hh==null||(hh<0)||(hh>23)){return 0;}
            i_val+=hh.length;}
        else if (token=="KK"||token=="K") {
            hh=_getInt(val,i_val,token.length,2);
            if(hh==null||(hh<0)||(hh>11)){return 0;}
            i_val+=hh.length;}
        else if (token=="kk"||token=="k") {
            hh=_getInt(val,i_val,token.length,2);
            if(hh==null||(hh<1)||(hh>24)){return 0;}
            i_val+=hh.length;hh--;}
        else if (token=="mm"||token=="m") {
            mm=_getInt(val,i_val,token.length,2);
            if(mm==null||(mm<0)||(mm>59)){return 0;}
            i_val+=mm.length;}
        else if (token=="ss"||token=="s") {
            ss=_getInt(val,i_val,token.length,2);
            if(ss==null||(ss<0)||(ss>59)){return 0;}
            i_val+=ss.length;}
        else if (token=="a") {
            if (val.substring(i_val,i_val+2).toLowerCase()=="am") {ampm="AM";}
            else if (val.substring(i_val,i_val+2).toLowerCase()=="pm") {ampm="PM";}
            else {return 0;}
            i_val+=2;}
        else {
            if (val.substring(i_val,i_val+token.length)!=token) {return 0;}
            else {i_val+=token.length;}
            }
        }
    // If there are any trailing characters left in the value, it doesn't match
    if (i_val != val.length) { return 0; }
    // Is date valid for month?
    if (month==2) {
        // Check for leap year
        if ( ( (year%4==0)&&(year%100 != 0) ) || (year%400==0) ) { // leap year
            if (date > 29){ return 0; }
            }
        else { if (date > 28) { return 0; } }
        }
    if ((month==4)||(month==6)||(month==9)||(month==11)) {
        if (date > 30) { return 0; }
        }
    // Correct hours value
    if (hh<12 && ampm=="PM") { hh=hh-0+12; }
    else if (hh>11 && ampm=="AM") { hh-=12; }
    var newdate=new Date(year,month-1,date,hh,mm,ss);
    return newdate.getTime();
}
// ------------------------------------------------------------------

function getCurrentDate()
{
    var mydate=new Date()
    var year=mydate.getYear()
    if (year < 1000)
    year+=1900;
    var day = mydate.getDay();
    var month = mydate.getMonth();
    var daym = mydate.getDate();
    if (daym<10)    daym="0"+daym;

    //To be pre-defined in Canlendar.inc to support multi-language
//  var dayarray=new Array("Ch&#7911; Nh&#7853;t","Th&#7913; Hai","Th&#7913; Ba","Th&#7913; T&#432;","Th&#7913; N&#259;m","Th&#7913; Sáu","Th&#7913; B&#7843;y");
//  var montharray=new Array("Tháng M&#7897;t","Tháng Hai","Tháng Ba","Tháng T&#432;","Tháng N&#259;m","Tháng Sáu","Tháng B&#7843;y","Tháng Tám","Tháng Chín","Tháng M&#432;&#7901;i","Tháng M&#432;&#7901;i M&#7897;t","Tháng M&#432;&#7901;i Hai");

    var strMonth = month + 1;
    if (strMonth<10)    strMonth="0" + strMonth;

    return yxDays[day]+", " + daym +"/" + strMonth + "/" + year;
}