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

StringgetFirstDay(String yearMonthStr, int range)
get First Day 
try {
    DateFormat sdf = new SimpleDateFormat("yyyyMMdd");
    Date date = sdf.parse(yearMonthStr + "01");
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(Calendar.MONTH, -(range - 1));
    Date first = calendar.getTime();
    return sdf.format(first);
...
StringgetFirstDayByMonthWeek(int year, int month, int week)
get First Day By Month Week 
DateFormat df = new SimpleDateFormat("yyyy-MM-dd ");
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month - 1);
c.set(Calendar.WEEK_OF_MONTH, week);
int firstDayofweek = c.getFirstDayOfWeek();
Calendar c1 = Calendar.getInstance();
c1.set(Calendar.YEAR, year);
...
StringgetFirstDayOfMonth(int year, int month)
get First Day Of Month 
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month);
cal.set(Calendar.DAY_OF_MONTH, cal.getMinimum(Calendar.DATE));
return new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());
StringgetFirstDayOfMonth(int year, int month, Integer day)
get First Day Of Month 
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month - 1);
if (day == null) {
    cal.set(Calendar.DAY_OF_MONTH, cal.getMinimum(Calendar.DATE));
} else {
    cal.set(Calendar.DAY_OF_MONTH, day);
StringBuffer sb = new StringBuffer();
String date = new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());
sb.append(date).append(" 00:00");
return sb.toString();
CalendargetFirstTimeOfDay(int year, int month, int day)
get First Time Of Day 
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month - 1);
cal.set(Calendar.DAY_OF_MONTH, day);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
return cal;
...
StringgetFirstYearMonth()
get First Year Month 
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-01-1");
Date curDate = new Date(System.currentTimeMillis());
return formatter.format(curDate);
intgetMonthDays(Integer year, Integer month)
get Month Days 
Calendar c = Calendar.getInstance();
c.set(year, month - 1, 1);
return c.getActualMaximum(Calendar.DAY_OF_MONTH);
IntegergetMonthDays(Integer year, Integer month)
get Month Days 
if (year != null && year > 0 && month != null && month > 0) {
    Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR, year);
    c.set(Calendar.MONTH, month);
    c.set(Calendar.DATE, 1);
    c.add(Calendar.DATE, -1);
    return c.get(Calendar.DATE);
return 0;
ListgetPerMonthByCuttentYear()
get Per Month By Cuttent Year 
String year = getCurrentYear();
Calendar a = Calendar.getInstance();
int month = a.get(Calendar.MONTH) + 1;
List<String> months = new ArrayList<String>();
for (int i = month; i > 0; i--) {
    months.add(year + "-" + String.format("%02d", i));
return months;
...
MapgetQuarterToYearMonthDay(Integer year, Integer quarter)
QuarterToYearMonthDay 
if (year != null && year > 0 && quarter != null && quarter > 0) {
    Map<String, String> map = new HashMap<String, String>();
    if (quarter == 1) {
        map.put("startTime", year + "-01-" + getMonthDays(year, 1) + " 00:00:00");
        map.put("endTime", year + "-03-" + getMonthDays(year, 3) + " 23:59:59");
    } else if (quarter == 2) {
        map.put("startTime", year + "-04-" + getMonthDays(year, 4) + " 00:00:00");
        map.put("endTime", year + "-06-" + getMonthDays(year, 6) + " 23:59:59");
...