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There is a newer version: 1.1.1

package nl.pvanassen.ns;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author Paul van Assen
 */
class UrlParamHelper {
    private final Charset charset;
    private static final UrlParamHelper INSTANCE = new UrlParamHelper();
    private UrlParamHelper() {
        if (!Charset.isSupported("UTF-8")) {
            throw new IllegalArgumentException("UTF-8 encoding not supported by platform");
        }
        charset = Charset.forName("UTF-8");
    }

    static String encode(String param) {
        // Keep null null
        if (param == null) {
            return null;
        }
        try {
            return URLEncoder.encode(param, INSTANCE.charset.name());
        }
        catch (UnsupportedEncodingException e) {
            // This has been checked on class setup.
            throw new IllegalArgumentException("UTF-8 encoding not supported by platform", e);
        }
    }

    static String formatDate(Date dateTime) {
        // Keep null null
        if (dateTime == null) {
            return null;
        }
        return new SimpleDateFormat(NsApi.DATETIME_FORMAT).format(dateTime);
    }
}