Java Utililty Methods String to Time

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
Date date = dateFormat.parse(time);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) + 1);
calendar.set(Calendar.DAY_OF_MONTH, 0);
Date[] dates = new Date[2];
dates[1] = calendar.getTime();
...

if (stStr == null) {
    return new GregorianCalendar();
Date date;
final SimpleDateFormat formatter = new SimpleDateFormat("yyyy:MM:dd:HH:mm:ss"); 
try {
    date = formatter.parse(stStr);
} catch (final Exception e) {
...

DateFormat dateFormat = DateFormat.getTimeInstance();
return "(" + dateFormat.format(new Date()) + ") " + str;

long secs = System.currentTimeMillis();
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
Date date = new Date(secs);
return sdf.format(date);

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.parse(date);

try {
    return parseDate(date, pattern).getTime();
} catch (ParseException e) {
    e.printStackTrace();
return 0;

long time = 0;
try {
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    Date date = sdf.parse(dateTimeString);
    time = date.getTime();
} catch (Exception e) {
    e.printStackTrace();
    time = 0;
...

return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(new File(file).lastModified()));

String timestr;
if (parrten == null || parrten.equals("")) {
    parrten = "yyyyMMddHHmmss";
java.text.SimpleDateFormat sdf = new SimpleDateFormat(parrten);
java.util.Date cday = new java.util.Date();
timestr = sdf.format(cday);
return timestr;
...

return new SimpleDateFormat(pattern).format(new Date());