//Funciones para la validación de la hora y fecha
var FechaLength ;

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}

function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr, formato){
	var dtCh= "/";
	var minYear=1900;
	var maxYear=5000;
	var daysInMonth = DaysArray(12);
	var bool        = false;
	
	var pos1	= dtStr.indexOf(dtCh);
	var pos2	= dtStr.indexOf(dtCh, pos1 +1 );

	// Declaring valid date character, minimum year and maximum year

	if (formato != ''){

		//formato dd/mm/yyyy
		if (formato.substring(0,2).toLowerCase() == "dd" && formato.substring(3,5).toLowerCase() == "mm" && formato.substring(6,10).toLowerCase() == "yyyy") 
		{
			bool= true;
			var strDay   = dtStr.substring(0,pos1);
			var strMonth  	= dtStr.substring(pos1+1,pos2);
		}
		
		//formato mm/dd/yyyy
		if (formato.substring(0,2).toLowerCase() == "mm" && formato.substring(3,5).toLowerCase() == "dd" && formato.substring(6,10).toLowerCase() == "yyyy")
		{

			bool 		= true;
			var strMonth 	= dtStr.substring(0,pos1);
			var strDay	= dtStr.substring(pos1+1,pos2);
		}

		if (bool == true)
		{		
			var strYear	= dtStr.substring(pos2+1,pos2+5);
			strYr		= strYear
			FechaLength      = pos2 + 5;
			
			if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
			if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
			for (var i = 1; i <= 3; i++) {
				if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
			}
			month=parseInt(strMonth)
			day=parseInt(strDay)
			year=parseInt(strYr)
			if (pos1==-1 || pos2==-1){
				alert('El formato de la fecha debe ser : '+ formato);
				return false;
			}

			if (strMonth.length<1 || month<1 || month>12){
				alert("El mes no es correcto.  Por favor digite un mes válido.");
				return false;
			}
			if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
				alert("El día no es correcto.  Por favor digite un día valido.");
				return false;
			}
			if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
				alert("El año no es correcto.  Por favor ingrese un digito válido entre "+minYear+" y "+maxYear);
				return false;
			}
			
			if (dtStr.indexOf(dtCh,pos2+1)!=-1 ){
				
				return false;
			}
		}
		else
		{	
			alert('El formato de fecha: '+ formato +' no se puede validar, aplica sólo para dd/mm/yyyy o mm/dd/yyyy');
			return false;
		}
		return true;
	}
	else
	{
		alert('El formato de la Fecha no se encuentra especificado en el parámetro: FormatoFecha.');
		return false;
	}
}
	
function Trim(TheString)
{
	var len;
	len = TheString.length;
	
 	while(TheString.substring(0,1) == " "){ //trim left
 		TheString = TheString.substring(1, len);
  		len = TheString.length;
	}

 	while(TheString.substring(len-1, len) == " "){ //trim right
 		TheString = TheString.substring(0, len-1);
  		len = TheString.length;
 	}
 	return TheString;
}
	
function EsNumerico(s){
	 var i;
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }

    return true;
}	

function ValidarCaracter(string, allowed) {
	for (var i=0; i< string.length; i++) {
		if (allowed.indexOf(string.charAt(i)) == 0)
			return true;
	}
	return false;
}