Java Utililty Methods Date Compare

List of utility methods to do Date Compare

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Description

The list of methods to do Date Compare are organized into topic(s).

Method

booleangetCompareResult(String date1, String date2)
get Compare Result 
Calendar calendar1 = Calendar.getInstance();
calendar1.setTime(strToDate(date1));
Calendar calendar2 = Calendar.getInstance();
calendar2.setTime(strToDate(date2));
if (calendar2.after(calendar1)) {
    return true;
return false;
...
booleanisAfterOrEqual(Date date, Date toCompare)
Returns true if toCompare is after or on same day as date. 
if (date == null || toCompare == null) {
    return false;
date = zeroTime(date);
toCompare = zeroTime(toCompare);
return toCompare.compareTo(date) <= 0;
booleanisBeforeDate(String sCompareDate)
is Before Date 
SimpleDateFormat clsFormat = new SimpleDateFormat("yyyy-MM-dd");
try {
    Date compareDate = clsFormat.parse(sCompareDate);
    Date currentDate = clsFormat.parse(clsFormat.format(new Date()));
    if (currentDate.before(compareDate)) {
        return true;
} catch (ParseException e) {
...
booleanisInDate(Date date, Date compareDate)
is In Date 
if (compareDate.after(getStartDate(date)) && compareDate.before(getFinallyDate(date))) {
    return true;
} else {
    return false;
Datemax(Collection datumok)
max 
Collection<Date> nemNullDatumok = new ArrayList<Date>();
for (Date date : datumok) {
    if (date != null) {
        nemNullDatumok.add(date);
Date max = nemNullDatumok.isEmpty() ? null : Collections.max(nemNullDatumok);
return max;
...
Datemax(Date a, Date b)
max 
if (a.after(b)) {
    return a;
return b;
Datemax(final Date a, final Date b)
max 
if (a == null) {
    return b;
} else if (b == null) {
    return a;
return a.after(b) ? a : b;
Datemax(Set dateSet)
max 
return (Date) new ArrayList(dateSet).stream().max(new Comparator<Date>() {
    @Override
    public int compare(Date o1, Date o2) {
        return o1.compareTo(o2);
}).get();
ListmergeNonDateKeys(List rowKeys, List columnKeys)
merge Non Date Keys 
if (rowKeys.size() > 0) {
    List<String> result = new ArrayList<String>(rowKeys.size() + columnKeys.size());
    result.addAll(rowKeys);
    result.addAll(columnKeys);
    return result;
} else {
    return columnKeys;
Calendarmin(Calendar... dates)
Takes in a varargs of calendars and returns the one with the earliest date 
Calendar least = null;
for (Calendar calendar : dates) {
    if (calendar != null) {
        if (least == null) {
            least = calendar;
        } else {
            if (calendar.before(least)) {
                least = calendar;
...