Trovit/src/main/java/org/openestate/io/trovit/TrovitUtils.java
public static String printDateValue(Calendar value) {
        if (value == null)
            throw new IllegalArgumentException("Can't print empty date value!");

        return new SimpleDateFormat("dd-MM-yyyy hh:mm:ss", Locale.ENGLISH)
                .format(value.getTime());
    }
public static String printDateValue(Calendar value) {
        if (value == null)
            throw new IllegalArgumentException("Can't print empty date value!");

        return new SimpleDateFormat("dd-MM-yyyy hh:mm:ss", Locale.ENGLISH)
                .format(value.getTime());
    }
Write a {@link Calendar} value into XML output.

@param value value to write
@return XML string
@throws IllegalArgumentException if a validation error occurred