Java Utililty Methods SQL Date

Date theDate = java.sql.Date.valueOf(theDataStr);
Calendar c = new GregorianCalendar();
c.setTime(theDate);
int day = c.get(Calendar.DAY_OF_MONTH);
if (day <= 10) {
    c.set(Calendar.DAY_OF_MONTH, 1);
} else if (day > 10 && day <= 20) {
    c.set(Calendar.DAY_OF_MONTH, 11);
...

Date end = java.sql.Date.valueOf(end_dt);
Date begin = java.sql.Date.valueOf(begin_dt);
int days = getDaysBetween(begin, end);
return days;

List list = new ArrayList();
String date = "";
int days = daysInMonth(year, month);
int weekday = 0;
for (int i = 1; i <= days; i++) {
    weekday = getWeekOfMonth(year, month, String.valueOf(i));
    if (weekday == 5) {
        if (i < 10) {
...

String fileName = "";
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
Date curDate = new Date(System.currentTimeMillis());
fileName = formatter.format(curDate) + ".png";
return fileName;

try {
    return increaseYearMonth(getNowShortDate().substring(0, 6)) + "01";
} catch (Exception e) {
    return "";

try {
    return getNowShortDate().substring(0, 6) + "01";
} catch (Exception e) {
    return "";

return "INSERT INTO tblempleado( id_empleado, nombre, apellidos, fecha_n, telefono, direccion, email, estado, id_cargo, id_empresa) values (?,?,?,?,?,?,?,?,?,?)";

return "INSERT INTO tblentrada_salida( id_empleado, cons, hora_entrada, hora_salida, fecha, id_empresa) values (?,?,?,?,?,?)";

return ((java.sql.Date.valueOf(ed)).getTime() - (java.sql.Date.valueOf(sd)).getTime()) / (3600 * 24 * 1000);

Calendar c = Calendar.getInstance();
c.setTime(getNowDate());
int today = c.get(5);
c.set(5, today - 1);
String lastDay = new SimpleDateFormat("yyyyMMdd").format(c.getTime());
return lastDay;