Java Utililty Methods SQL Time

if (time1 == null || time2 == null)
    return 0;
return getIntervalDays(time1.getTime(), time2.getTime());

String str = getSysDateTime();
str = str.substring(0, 4) + str.substring(5, 7) + str.substring(8, 10) + str.substring(11, 13)
        + str.substring(14, 16) + str.substring(17, 19);
return str;

calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
return new Timestamp(calendar.getTimeInMillis());

List<String> filelist = getAllFileName(path);
Timestamp time = null;
for (String s : filelist) {
    File f = new File(s);
    if (time == null) {
        time = new Timestamp(f.lastModified());
    } else {
        if (time.getTime() < new Timestamp(f.lastModified()).getTime()) {
...

int maxRow = 0;
Statement stmt = null;
ResultSet rs = null;
try {
    stmt = jdbcConnection.createStatement();
    String sql = MessageFormat.format("SELECT max(polltime) as maxpoll FROM {0}", tableName);
    rs = stmt.executeQuery(sql);
    if (rs.next()) {
...

GregorianCalendar date = new GregorianCalendar();
return date.getTime();

if (serverTimeZone == null) {
    String url = dbSettings.getProperty("hibernate.connection.url");
    String username = dbSettings.getProperty("hibernate.connection.username");
    String password = dbSettings.getProperty("hibernate.connection.password");
    Connection conn = DriverManager.getConnection(url, username, password);
    ResultSet rs = conn.createStatement()
            .executeQuery("select timestampdiff(HOUR,utc_timestamp(), current_timestamp());");
    String timediff = "";
...

dateTime = dateTime * 1000;
long sd = (dateTime - 28800000);
Date dat = new Date(sd);
return formatTime(dat);

return new Timestamp(datetime);

Calendar caldate = Calendar.getInstance();
Timestamp t = new Timestamp(caldate.getTimeInMillis());
t.setTime(caldate.getTimeInMillis());
return t;