My problem is that I receive a String element from my form, which can be of these two formats:
fecha = "010117";
or
fecha = "01012017";
And I need to format them to a date format valid as "01/01/2017" , I've tried to do it in several ways, including this one:
var newfecha = new Date( fecha.replace( /(\d{2})-(\d{2})-(\d{4})/, "$2/$1/$3") );
But do not do it correctly, could someone give me any suggestions?
I'll give you an example in javascript in case it helps you.
alert(checkDate('010117'));
alert(checkDate('01012017'));
function checkDate(myFecha){
var ret = "error";
//pasa la expresion regular
var m = myFecha.match(/^(\d{2})(\d{2})(\d{2,4})$/);
if(m==null){
alert('la fecha no es valida');
} else {
//si vienen sólo 2 digitos en año asumo que es el año 2000
if(m[3].length==2){
m[3] = '20' + m[3];
}
try {
//usa la funcion toISOString para comprobar que la fecha es válida
new Date(m[3] + '-' + m[2] + '-' + m[1]).toISOString();
ret = m[1] + '-' + m[2] + '-' + m[3];
}
catch(err) {
alert('la fecha no es valida');
}
}
return ret;
}
You could use a SimpleDataFormat:
SimpleDateFormat formato;
if(fecha.length==6)
formato = new SimpleDateFormat("MMddyy");
else
formato = new SimpleDateFormat("MMddyyyy");
try {
Date date = formato.parse(fecha);
System.out.println(date);
//Fecha con formato dd-MM-yyyy
System.out.println(new SimpleDateFormat("dd-MM-yyyy").format(date));
} catch (ParseException ex) {
//
}
Greetings,
Try this line:
fecha.replace(/(\d{2})(\d{2})(\d+)/, function(s, d, m, a){
return [d, m, a.length === 2 ? "20" + a : a].join("/")
});
The purpose is to separate the (4 or 2) (\ d +) last numbers, then prefix 20 if in case it has 2 digits.
//var fecha = "01012017";
var fecha = "010117";
var newFecha = fecha.replace(/(\d{2})(\d{2})(\d+)/, function(s, d, m, a){
return [d, m, a.length === 2 ? "20" + a : a].join("/")
});
console.log(newFecha); //01/01/2017