URL-compatible DateTime string from timestamp

gistfile1.java

String dateStringFromTimestemp(long miliseconds)
{
    Date date = new Date(miliseconds);
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = format.format(date);
    return dateString;
}

String getNotificationsAfter(long miliseconds)
{
    String dateString = URLEncoder.encode(dateStringFromTimestemp(miliseconds), "utf-8");
    String url = "http://www.l-somewhere.com/api/notifications?offset=0&limit=20&after_datetime=" + dateString;
    // Pseudo code
    URL.GET(url, onSuccess=gotNotification);
}

void gotNotification(String returnedData)
{
    // blah blah blah
}