DateTimeConverter.java

package no.met.metadataeditor;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import javax.faces.convert.FacesConverter;

@FacesConverter("no.met.metadataeditor.DateTimeConverter")
public class DateTimeConverter implements Converter {

    public static final String FROM_UI_FORMAT = "yyyy-MM-dd HH:mm";
    
    public static final String FROM_XML_FORMAT = "yyyy-MM-dd'T'HH:mm:ss'Z'";    

    private static DateFormat fromUIFormat = new SimpleDateFormat(FROM_UI_FORMAT);
    private static DateFormat fromXMLFormat = new SimpleDateFormat(FROM_XML_FORMAT);
    
    static {
        fromUIFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
        fromXMLFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
    }
    
    @Override
    public Object getAsObject(FacesContext arg0, UIComponent arg1, String dateString) throws ConverterException {

      try {
          Date uiDate = fromUIFormat.parse(dateString);
          return fromXMLFormat.format(uiDate);
          
      } catch (ParseException e) {
          return dateString;
      }
            
    }

    @Override
    public String getAsString(FacesContext arg0, UIComponent arg1, Object value) throws ConverterException {

        if( value instanceof String){
            String dateString = (String) value;

            try {
                Date uiDate = fromXMLFormat.parse(dateString);
                return fromUIFormat.format(uiDate);
                
            } catch (ParseException e) {
                return dateString;
            }                
        }
        
        return value.toString();

    }

}