Java Utililty Methods Hour Format

return LOG_DATE_IN_HOUR_FORMAT.format(date);

if (date != null) {
    TimeZone tZone = TimeZone.getTimeZone(timeZoneId);
    SimpleDateFormat dateFormater = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
    dateFormater.setTimeZone(tZone);
    return dateFormater.format(date);
return null;

String dateFormat = "yyyyMMddHHmm";
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(dateFormat);
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
return sdf.format(d);

try {
    if ("".equals(dateString) || dateString == null) {
        return null;
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    Date date = sdf.parse(dateString);
    sdf.applyPattern("yyyy-MM-dd HH:mm:ss");
    return sdf.format(date);
...

String[] patterns = new String[6];
Pattern p0;
Pattern p1;
Pattern p2;
Pattern p3;
Pattern p4;
Pattern p5;
patterns[0] = "(0[1-9]|[12][0-9]|3[01])/(0[1-9]|1[012])/((\\d\\d)|((19|20)\\d\\d))\\s([1-9]|([01][0-9])|(2[1-3])):((0[0-9])|([12345][0-9])):((0[0-9])|([12345][0-9])).[0-9]*";
...

return formatDateTime(new Date(System.currentTimeMillis()));

synchronized (dtg) {
    if (cal == null) {
        return "unknown";
    return dtg.format(cal.getTime());

assert dateTime != null : "Parameter 'dateTime' of method 'formatDateTime' must not be null";
return DATE_TIME_FORMAT.format(new Date(dateTime.getTimeInMillis()));

if (time == null) {
    return "";
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");
return df.format(time.getTime());

return new SimpleDateFormat(DATETIME_FORMAT).format(d);