Java Utililty Methods Time Format

GregorianCalendar gCalendar = new GregorianCalendar();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String strDateTime;
try {
    strDateTime = formatter.format(gCalendar.getTime());
} catch (Exception ex) {
    System.out.println("Error Message:".concat(String.valueOf(String.valueOf(ex.toString()))));
    String s = null;
...

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

SimpleDateFormat sdf;
if (format == null || format.equalsIgnoreCase("")) {
    sdf = new SimpleDateFormat(DEFAULT_FORMAT);
} else {
    sdf = new SimpleDateFormat(format);
return sdf.format(date);

return format(date, "yyyyMMddHHmmss");

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = new Date(System.currentTimeMillis());
return formatter.format(date);

Date date = new Date();
SimpleDateFormat formatter = new SimpleDateFormat(pattern);
String dateString = formatter.format(date);
return dateString;

final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
return dateFormat.format(date);

SimpleDateFormat sdfDate = new SimpleDateFormat(pattern);
return sdfDate.format(date);

try {
    return new SimpleDateFormat(dateFormat)
            .format(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'").parse(date));
} catch (ParseException e) {
    return "";

long milliseconds = getDuration(fromTime);
long seconds = milliseconds / MS_IN_SECOND;
long minutes = seconds / SEC_IN_MINUTE;
Object[] args = { Long.valueOf(minutes), Long.valueOf(seconds % SEC_IN_MINUTE) };
return TIME_FORMAT.format(args);