Java Utililty Methods Day in Month

List of utility methods to do Day in Month

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Description

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

Method

StringcurrentMonthFirstDay()
current Month First Day 
SimpleDateFormat sdf = new SimpleDateFormat(DATE_PATTERN);
Date curDate = new Date(System.currentTimeMillis());
Calendar calendar = Calendar.getInstance();
calendar.setTime(curDate);
calendar.set(Calendar.DAY_OF_MONTH, 1);
return sdf.format(calendar.getTime());
intdayForMonth(String pTime)
day For Month 
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
c.setTime(format.parse(pTime));
int m = c.get(Calendar.DAY_OF_MONTH);
return m;
intdaysInMonth(int month, boolean isLeapYear)
days In Month 
int i = (month - 1) + 12 * (isLeapYear ? 1 : 0);
return DAYS_IN_MONTH[i];
intdaysInMonth(int month, int year)
return the number of days in the month of the year. 
return daysInMonth[isLeapYear(year) ? 1 : 0][month];
intdaysInMonth(int year, int month)
days In Month 
int daysInMonth;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
...
int[]daysOfMonth(int year)
days Of Month 
if (isLeapYear(year)) {
    return DAYS_OF_MONTH_IN_LEAP_YEAR;
return DAYS_OF_MONTH_IN_NORMAL_YEAR;
intdaysOfMonth(int year, int month)
days Of Month 
int days = 0;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
...
StringfirstDayOfLastMonth()
first Day Of Last Month 
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, -1);
cal.set(Calendar.DATE, 1);
return String.valueOf(dfDdMMMYYYY.format(cal.getTime()));
intfirstDayOfMonth(int commonMonthIndx, int iyear)
first Day Of Month 
return ((commonMonthIndx > 2) ? leapYearBalance(iyear) : 0) + FirstDayOfMonth[commonMonthIndx - 1];
StringfirstDayOfMonth(int year, int month, String dateFormat)
get first day of specified month and specified year in specified date format. 
Calendar cal = Calendar.getInstance();
cal.setTime(new Date());
cal.add(Calendar.YEAR, year);
cal.add(Calendar.MONTH, month);
cal.set(Calendar.DAY_OF_MONTH, 1);
SimpleDateFormat formatter = new SimpleDateFormat(dateFormat);
return formatter.format(cal.getTime());