Java Utililty Methods Timestamp Format

synchronized (FORMAT_TIMESTAMP) {
    return FORMAT_TIMESTAMP.format(date);

return file != null && file.exists() ? getLocaleFormattedDateTime(file.lastModified()) : null;

Date date = new Date(timestamp);
DateFormat formatter = new SimpleDateFormat(formatString, Locale.US);
return (formatter.format(date));

DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM, locale);
String localeString = locale.toString();
if (localeString.equals("zh_SG")) {
    return new SimpleDateFormat("dd/MM/yyyy a hh:mm");
} else if (localeString.equals("ko")) {
    return changeDateFormatPattern(dateFormat, "y+\\. *M+\\. *d+", "yyyy-MM-dd");
return changeDateFormatPattern(dateFormat, "y+", "yyyy");
...

return "<small>" + getCurrentHour(useTwentyFourFormat) + ":" + getCurrentMinutes() + "</small> ";

Date date = new Date();
SimpleDateFormat sdf;
try {
    sdf = new SimpleDateFormat(format);
} catch (NullPointerException | IllegalArgumentException e) {
    sdf = new SimpleDateFormat(TIMESTAMP_FORMAT);
return sdf.format(date);
...

return _datetime(format);

ThreadLocal<SimpleDateFormat> tl = timestampFormatPool.get(timestampPattern);
if (null == tl) {
    synchronized (timestampFormatLock) {
        tl = timestampFormatPool.get(timestampPattern);
        if (null == tl) {
            tl = new ThreadLocal<SimpleDateFormat>() {
                @Override
                protected synchronized SimpleDateFormat initialValue() {
...

return mDateFormat.format(date) + " " + mElapsedTimeFormat.format(date);

if (date == null)
    return null;
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd-HH.mm.ss.SSSSSS");
return simpleDateFormat.format(date);