Java Utililty Methods Year Month

List of utility methods to do Year Month

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Description

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

Method

intgetYearMonth(Date date)
get Year Month 
Calendar c = Calendar.getInstance();
c.setTime(date);
return (c.get(Calendar.YEAR)) * 100 + c.get(Calendar.MONTH) + 1;
DategetYearMonth(String dateString)
get Year Month 
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
Date date;
try {
    date = sdf.parse(dateString);
} catch (ParseException e) {
    e.printStackTrace();
    return null;
return date;
ListgetYearMonth(String year)
get Year Month 
if (null == year || "".equals(year.trim())) {
    year = yearFormat.format(new Date());
List<String> yearMonth = new ArrayList<String>();
int currentYear = Integer.parseInt(year);
int lastYear = Integer.parseInt(year) - 1;
for (int j = currentYear; j >= lastYear; j--) {
    for (int i = 12; i >= 1; i--) {
...
StringgetYearMonthDate()
get Year Month Date 
return new SimpleDateFormat("yyyyMMdd").format(new Date());
StringgetYearMonthDateByMisSecond(long misSecond)
get Year Month Date By Mis Second 
if (misSecond < 0) {
    throw new IllegalArgumentException("The misSecond must not be negative");
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(misSecond);
java.util.Date date = cal.getTime();
return getStrDate(date, "yyyy-MM-dd");
StringgetYearMonthDay()
get Year Month Day 
CALENDAR.setTime(new Date());
int year = CALENDAR.get(Calendar.YEAR);
int month = CALENDAR.get(Calendar.MONTH) + 1;
return year + "" + month;
StringgetYearMonthDay(Date date)
get Year Month Day 
SimpleDateFormat formatter = new SimpleDateFormat(FORMAT12);
String currentTime = formatter.format(date);
return currentTime;
DategetYearMonthDay(final int year, final int month, final int day)
Return normalized year month day date (desired day in month at 00:00:00.000 pm) 
final Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH, month - 1);
calendar.set(Calendar.DAY_OF_MONTH, day);
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
...
Date[]getYearMonthList(int year)
return array including 12 months of one year 
Calendar cal = Calendar.getInstance();
if (year > 0)
    cal.set(Calendar.YEAR, year);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
...
ListgetYearMonths(List time)
Get year months 
List<String> yms = new ArrayList<>();
SimpleDateFormat format = new SimpleDateFormat("yyyyMM");
String ym;
for (Date t : time) {
    ym = format.format(t);
    if (!yms.contains(ym)) {
        yms.add(ym);
return yms;