Java Utililty Methods Year Format

List of utility methods to do Year Format

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Description

The list of methods to do Year Format are organized into topic(s).

Method

booleanisPartialYear(String s, String yearFormat)
Allow only 4 digits, no more, no less 
int dn = 0;
char[] cyear = s.toCharArray();
for (char c : cyear) {
    if (!Character.isDigit(c)) {
        return false;
    ++dn;
if (dn != 4) {
    return false;
String yearformat = parseDateFormat(yearFormat) + "-MM-dd";
SimpleDateFormat sdf_y = new SimpleDateFormat(yearformat);
sdf_y.setLenient(false);
String sy = s + "-01-18";
try {
    sdf_y.parse(sy);
    return true;
} catch (Exception e) {
    return false;
StringisValidDateMMddyyyy(String theString)
is Valid Date M Mddyyyy 
String dateFormat = MMddyyyyFORMATSlashes;
String dateRegexp = MMddyyyySlashes;
return ifValidDateFormatAsyyyyMMdd(theString, dateFormat, dateRegexp);
booleanisYear(int y)
is Year 
return y >= 100 && y <= 5000;
booleanisYear(String str, boolean nullCheck)
is Year 
if (nullCheck == false || isRequired(str)) {
    if (str == null) {
        return true;
    if (isNumber(str, false)) {
        int year = Integer.parseInt(str.trim());
        if (year < 1500 && year > 2999) {
            return false;
...
booleanisYearOnly(String input)
is Year Only 
return input.matches("[0-9]{4}");
booleanisYYYY(String strDate)
is YYYY 
try {
    parse(strDate, YYYY);
    return true;
} catch (ParseException pe) {
    return false;
StringlastDayOfWeek(String year, int week, String format)
last Day Of Week 
SimpleDateFormat dayFormat = new SimpleDateFormat(format, Locale.UK);
Calendar calendar = Calendar.getInstance(Locale.UK);
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.setMinimalDaysInFirstWeek(4);
calendar.set(Calendar.WEEK_OF_YEAR, week);
calendar.set(Calendar.YEAR, Integer.parseInt(year));
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
Date date = calendar.getTime();
...
DatestringYYYYmmDDhhMMssToDate(String value)
string YYY Ymm D Dhh M Mss To Date 
try {
    SimpleDateFormat dbUpdateDateTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    return dbUpdateDateTime.parse(value);
} catch (ParseException ex) {
return null;
StringtoDateString(String ddMMMyyyy)
to Date String 
String dateString = "";
try {
    Date date = new SimpleDateFormat("ddMMMyyyy", Locale.US).parse(ddMMMyyyy);
    dateString = new SimpleDateFormat("yyyy-MM-dd", Locale.US).format(date);
} catch (Exception e) {
    e.printStackTrace();
    return "";
return dateString;
StringtoYYYYMM(Date date)
to YYYYMM 
return toYYYYMM(date, null);