How to convert a string to date

[rdvg...@gmail.com]

Hi,

In java you could have the following method:

public static Date ParseFecha(String fecha) { 

     SimpleDateFormat formato = new SimpleDateFormat("dd/MM/yyyy"); 

     Date fechaDate = null; 

     try { 

           fechaDate = formato.parse(fecha); 

      }   

           catch (ParseException ex) {

               System.out.println(ex); 

      } 

     return fechaDate; 

 }

How can I get this to work in CodenameOne?

[rdvg...@gmail.com]

Hi,

I created a new method in CodenameOne, but it is sending me an error. 

To test:

  fecha = new Date (). ToString ()

  tipo = "T"

    public static String cambiaFormatoFecha(String fecha, String tipo) {

        String formato = tipo.equals("F") ? "yyyy-MM-dd" : tipo.equals("H") ? "hh:mm:ss" : tipo.equals("T") ? "yyyy-MM-dd hh:mm:ss" : "";

        SimpleDateFormat formaFecha = new SimpleDateFormat(formato);

        Date d = null;

        try {

            d = formaFecha.parse(fecha);

        } catch (ParseException ex) {

            Dialog.show("Error", "Error formato de fecha", "Continuar", null);

        }

        return formaFecha.format(d);

    }

[Shai Almog]

Hi,
I don't understand the problem. We have SimpleDateFormat in Codename One it's just under the codename one packages in the import.

[Dave Dyer]

The problem with SimpleDateFormat is that it can't cope with a lot of the junk that passes for "date" out there

in the real world.  I gave up and wrote my own parser, which I have extended to handle the dates that I actually

encounter.

[rdvg...@gmail.com]

Hi,

Thanks for the comments, I wish you could do the test of the method that I included with the test data and validate the problem that I am detecting.

[Shai Almog]

Hi,

the initial code you listed should work fine in Codename One. What isn't working when you try to run that code?

[rdvg...@gmail.com]

Hi,

When execute   String f  = cambiaFormatoFecha(new Date().toString(), "F");

Return "Invalid year value".

[Javier Anton]

Hey,

Your method that you shared makes very little sense.

You pass new Date.toString() as a parameter but this is not the proper way to create a string from a date

The proper way is to first create a SimpleDateFormat with your desired format and then crate the string by doing .format(date)

Your method would make more sense like this:

 public static String cambiaFormatoFecha(Date fecha, String tipo) {

        String formato = tipo.equals("F") ? "yyyy-MM-dd" : tipo.equals("H") ? "hh:mm:ss" : tipo.equals("T") ? "yyyy-MM-dd hh:mm:ss" : "";

        SimpleDateFormat formaFecha = new SimpleDateFormat(formato);

        return formaFecha.format(fecha);

    }

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[Javier Anton]

Furthermore, if your source Date is actually a string instead of a Date, you can do this:

public static String cambiaFormatoFecha(String fechaOrigenString,  String tipoOrigen, String tipoDestino) {

        String formatoOrigen = tipoOrigen.equals("F") ? "yyyy-MM-dd" : tipoOrigen.equals("H") ? "hh:mm:ss" : tipoOrigen.equals("T") ? "yyyy-MM-dd hh:mm:ss" : "";

        SimpleDateFormat formaFechaOrigen = new SimpleDateFormat(formatoOrigen );

        Date fechaOrigen = formaFechaOrigen.parse(fechaOrigenString);

        String formatoDestino = tipoDestino.equals("F") ? "yyyy-MM-dd" : tipoDestino.equals("H") ? "hh:mm:ss" : tipoDestino.equals("T") ? "yyyy-MM-dd hh:mm:ss" : "";

        SimpleDateFormat formaFechaDestino = new SimpleDateFormat(formatoDestino);

        return formaFechaDestino.format(fechaOrigen );

    }

[Javier Anton]

The key point is that new Date().toString() will produce different formats depending on each user's culture, so it cannot be relied upon to go into SimpleDateFormat.parse

[rdvg...@gmail.com]

Thank you