Java Utililty Methods Date Format Pattern

String cfValue = "";
if (customFieldValue instanceof Date) {
    SimpleDateFormat sdf = new SimpleDateFormat("dd/MMM/yy");
    Date date = (Date) customFieldValue;
    cfValue = sdf.format(date).toString();
} else {
    cfValue = customFieldValue.toString();
return cfValue;

return formatter;

DateFormat formatter = FORMATTER.get();
if (formatter == null) {
    formatter = createIsoDateFormatter();
    FORMATTER.set(formatter);
return formatter;

if (!formatters.containsKey(pattern)) {
    formatters.put(pattern, new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat(pattern);
    });
return formatters.get(pattern);

SimpleDateFormat sdf = null;
if (formatters.containsKey(pattern)) {
    sdf = formatters.get(pattern);
} else {
    sdf = new SimpleDateFormat(pattern);
    formatters.put(pattern, sdf);
return sdf;
...

if (sdfs == null) {
    SimpleDateFormat[] tmp = new SimpleDateFormat[formats.length];
    for (int i = 0; i < formats.length; i++) {
        tmp[i] = new SimpleDateFormat(formats[i]);
    sdfs = tmp;
return sdfs;
...

yyyy-MM-dd_HH-mm-ss

return new SimpleDateFormat(FORMAT_TO_SECS_FOR_FILE);

DateFormat format = headerFormat.get();
if (format == null) {
    format = new SimpleDateFormat(HEADER_FORMAT, Locale.ENGLISH);
    format.setTimeZone(TimeZone.getTimeZone("UTC"));
    headerFormat.set(format);
return format;

SimpleDateFormat tformatter = new SimpleDateFormat(format);
tformatter.setLenient(false);
return tformatter;

SimpleDateFormat formatterMM = new SimpleDateFormat("MM");
return formatterMM.format(Calendar.getInstance().getTime());