Java Utililty Methods Date Format

SimpleDateFormat formatter = null;
int dot = dateTime.indexOf('.');
int col = dateTime.indexOf(':');
if (col > 0) {
    if (dot > 0) {
        formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
    } else {
        formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
...

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
Date date = null;
try {
    date = sdf.parse(datetime);
} catch (ParseException e) {
    e.printStackTrace();
Calendar cl = Calendar.getInstance();
...

SimpleDateFormat ret = new SimpleDateFormat(df);
ret.setTimeZone(timeZone);
return ret;

return dateFormat(format, date, null, null);

if (date == null) {
    return null;
if (format == null) {
    for (int i = 0; i < tsDefaultFormats.length; i++) {
        String dFormat = tsDefaultFormats[i];
        try {
            String df = dateFormat(dFormat, date, tz, locale);
...

if (format != null && !format.trim().isEmpty()) {
    format = format.trim();
    if (format.startsWith("fmt:")) {
        format = format.substring(4);
        format = format.replace("%Y", "yyyy");
        format = format.replace("%y", "yy");
        format = format.replace("%m", "MM");
        format = format.replace("%d", "dd");
...

SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
Date date = simpleDateFormat.parse(text);
return date;

if (date == null) {
    return null;
} else {
    return sdf3.format(date);

return new SimpleDateFormat("yyyy-MM-dd");

return dateFormatCheck(source, "yyyyMMdd");