[android help] Android format a UTC datetime string into local format throws null error

hi I have the method below which takes the value of a UTC datetime string, format it to local display and return:

public static String convertDateStringUTCToLocal(String sourceUtcDateTimeString)
{
    SimpleDateFormat simpleDataFormat = new SimpleDateFormat();
    simpleDataFormat.setTimeZone(getCurrentTimeZone());
    String outputUTCDateTimeString = simpleDataFormat.parse(sourceUtcDateTimeString, new ParsePosition(0)).toString();

    return outputUTCDateTimeString;
}

public static TimeZone getCurrentTimeZone()
{
    Calendar calendar = Calendar.getInstance();
    TimeZone outputTimeZone = calendar.getTimeZone();

    return outputTimeZone;
}

When debugging, the value of parameter sourceUtcDateTimeString is 'Mon Apr 15 13:54:00 GMT 2013', I found that 'simpleDataFormat.parse(sourceUtcDateTimeString, new ParsePosition(0))' gives me 'null', and 'simpleDataFormat.parse(sourceUtcDateTimeString, new ParsePosition(0)).toString()' throws error "java.lang.NullPointerException at toString()".

Looks like there is nothing at ParsePosition(0), but I am really new to Android dev, no idea why this is happening and how to get around it, could any one help out with a fix? I got stuck on this issue for hours.

thanks in advance.

.

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