Java Utililty Methods String to Timestamp

try {
    return String.valueOf(sdf.parse(timestamp).getTime());
} catch (ParseException e) {
    return "-1";

String namePart = getFileNameUpToExtension(fileName);
String extension = getFileExtension(fileName);
StringBuilder newName = new StringBuilder(namePart);
newName.append(".[backup from - ");
DateFormat dateFormat = DateFormat.getDateTimeInstance();
newName.append(dateFormat.format(new Date()));
newName.append("]");
newName.append(extension);
...

try {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    ParsePosition parsePosition = new ParsePosition(0);
    Date date = simpleDateFormat.parse(string, parsePosition);
    return date.getTime();
} catch (Exception e) {
    return -1;

SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");
ParsePosition pos = new ParsePosition(0);
Date d = formatter.parse(date, pos);
return String.valueOf(d.getTime());

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-M-dd hh:mm:ss");
Date date = null;
try {
    date = sdf.parse(dateTime);
} catch (ParseException e) {
    e.printStackTrace();
Calendar calendar = Calendar.getInstance();
...

DateFormat d = new SimpleDateFormat(pattern);
Calendar c = Calendar.getInstance(timezone);
c.setTime(d.parse(dateValue));
return c.getTimeInMillis();

return getTime(new Date(), pattern, currentLocale);

long returnTimeStamp = 0;
Date aDate = null;
try {
    aDate = convertStringToDate(pattern, strDate);
} catch (ParseException pe) {
    aDate = null;
if (aDate == null) {
...

DateFormat format = new SimpleDateFormat(style);
return format.format(date);

SimpleDateFormat timeDf = new SimpleDateFormat("yyyyMMdd");
String resultValue = "0";
try {
    new Date(Long.valueOf(timeStampStr) * 1000);
    resultValue = timeStampStr;
} catch (NumberFormatException e) {
    try {
        Date date = timeDf.parse(logRundateIdStr);
...