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

StringgetPreMonthDayStr(String curday)
get Pre Month Day Str 
int year = getYear(curday);
String monthStr = getMonth(curday);
int month = Integer.parseInt(monthStr);
if (month <= 1) {
    month = 12;
    year = year - 1;
} else
    month = month - 1;
...
StringgetStartMonthDayOfDate(String yyyyMM)
get Start Month Day Of Date 
return yyyyMM + "01";
booleanis31DaysMonth(int month)

Verify if a given month has 31 days or not. 

int[] months31 = { 0, 2, 4, 6, 7, 9, 11 };
for (int i = months31.length - 1; i >= 0; i--) {
    if (months31[i] == month) {
        return true;
return false;
booleanisDayMonth(String types)
is Day Month 
if (DATE_TIME_LEVEL_TYPE_MONTH.equals(types))
    return true;
else
    return false;
booleanisDayOfMonth(int num)
is Day Of Month 
return isNumBetween(1, num, 31);
booleanisLastDayOfMonth(int day, int month, int year)

Verify if the given date is the last day in the month. 

if (month == 1) { 
    return isLeapYear(year) ? day == 29 : day == 28;
} else {
    return is31DaysMonth(month) ? day == 31 : day == 30;
intmaxDayOfMonth(int year, int month)
max Day Of Month 
if (month <= 0 || month > 12) {
    return -1;
int day = 0;
switch (month) {
case 2:
    day = 28;
    break;
...
intmonthDays(int y, int m)
month Days 
if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0)
    return 29;
else
    return 30;
intnumDaysInMonth(int month)
num Days In Month 
switch (month) {
case 2:
    return 28;
case 4:
case 6:
case 9:
case 11:
    return 30;
...
StringpadMonthOrDay(String mod)
Pad the month or day with a leading zero 
if (mod.matches("\\d{2}")) {
    return mod;
} else if (mod.matches("\\d")) {
    return "0" + mod;
} else { 
    return "";