Java Utililty Methods Hour Format

if (src == null) {
    return "";
DateFormat fmt = new SimpleDateFormat(formatPattern);
return fmt.format(src);

if (date == null)
    throw new IllegalArgumentException("date is null");
if (pattern == null)
    throw new IllegalArgumentException("pattern is null");
final SimpleDateFormat formatter = new SimpleDateFormat(pattern, Locale.US);
formatter.setTimeZone(GMT);
return formatter.format(date);

if (date == null) {
    return null;
if (pattern == null) {
    pattern = DEFAULT_PATTERN;
final SimpleDateFormat formatter = new SimpleDateFormat(pattern);
return formatter.format(date);
...

if (date.isEmpty())
    return date;
DateFormat df = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy");
Date formattedDate = df.parse(date);
return formatedDateWithTime(formattedDate);

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

return formatDate(dtFormat, sFormatString, Locale.getDefault(), TimeZone.getDefault());

if (obj == null || obj.toString() == "") {
    return "";
SimpleDateFormat dateFormat = null;
if (DAY_STR.equals(format)) {
    dateFormat = DAY_FORMAT;
} else if (TIME_STR.equals(format)) {
    dateFormat = TIME_FORMAT;
...

return format(date, "yyyy-MM-dd");

String str = "";
if (date == null || date.equals("")) {
    str = "";
} else if (date.length() >= 10) {
    str = date.substring(0, 10);
} else {
    str = date;
return str;

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Date date = null;
try {
    date = dateFormat.parse(dateTimeString);
} catch (ParseException e) {
    e.printStackTrace();
Calendar cal = Calendar.getInstance();
...