Number of days in particular month of particular year

Question

How to know how many days has particular month of particular year   String date    2010-01-19   String   ymd   date split  -    int year   Integer parseInt ymd 0    int month   Integer parseInt ymd 1    int day   Integer parseInt ymd 2    Calendar calendar   Calendar getInstance    calendar set Calendar YEAR year   calendar set Calendar MONTH month   int daysQty   calendar getDaysNumber       Something like this

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String date    11-02-2000   String   input   date split  -    int day   Integer valueOf input 0    int month   Integer valueOf input 1    int year   Integer valueOf input 2    Calendar cal Calendar getInstance    cal set Calendar YEAR year   cal set Calendar MONTH month-1   cal set Calendar DATE  day     since month number starts from 0  i e jan 0  feb 1      we are subtracting original month by 1 int days   cal getActualMaximum Calendar DAY OF MONTH   System out println days

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java time LocalDate  From Java 1 8  you can use the method lengthOfMonth on java time LocalDate   LocalDate date   LocalDate of 2010  1  19   int days   date lengthOfMonth

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import java text ParseException  import java text SimpleDateFormat  import java util Calendar  import java util Date         44  Return the number of days in a month      where month and year are given as input      public class ex44       public static void dateReturn int m int y                int m1 m          int y1 y          String str      m1  -  y1          System out println str           SimpleDateFormat sd new SimpleDateFormat  MM-yyyy             try               Date d sd parse str               System out println d               Calendar c Calendar getInstance                c setTime d               System out println c getActualMaximum Calendar DAY OF MONTH              catch  ParseException e                   TODO Auto-generated catch block             e printStackTrace                         public static void main String   args    dateReturn 2 2012

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String  MonthOfName       int number Of DaysInMonth   0     year month numberOfMonth 2018 11      calling this method to assign values to the variables MonthOfName and number Of DaysInMonth   System out print  Number Of Days    number Of DaysInMonth     name of the month      MonthOfName     public void numberOfMonth int year  int month        switch  month            case 1              MonthOfName    January               number Of DaysInMonth   31              break          case 2              MonthOfName    February               if   year   400    0       year   4    0   amp  amp   year   100    0                      number Of DaysInMonth   29                else                   number Of DaysInMonth   28                            break          case 3              MonthOfName    March               number Of DaysInMonth   31              break          case 4              MonthOfName    April               number Of DaysInMonth   30              break          case 5              MonthOfName    May               number Of DaysInMonth   31              break          case 6              MonthOfName    June               number Of DaysInMonth   30              break          case 7              MonthOfName    July               number Of DaysInMonth   31              break          case 8              MonthOfName    August               number Of DaysInMonth   31              break          case 9              MonthOfName    September               number Of DaysInMonth   30              break          case 10              MonthOfName    October               number Of DaysInMonth   31              break          case 11              MonthOfName    November               number Of DaysInMonth   30              break          case 12              MonthOfName    December               number Of DaysInMonth   31

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Java 8 and later   Warren M  Nocos   If you are trying to use Java 8 s new Date and Time API  you can use java time YearMonth class  See Oracle Tutorial      Get the number of days in that month YearMonth yearMonthObject   YearMonth of 1999  2   int daysInMonth   yearMonthObject lengthOfMonth      28     Test  try a month in a leap year   yearMonthObject   YearMonth of 2000  2   daysInMonth   yearMonthObject lengthOfMonth      29    Java 7 and earlier  Create a calendar  set year and month and use getActualMaximum  int iYear   1999  int iMonth   Calendar FEBRUARY     1  months begin with 0  int iDay   1      Create a calendar object and set year and month Calendar mycal   new GregorianCalendar iYear  iMonth  iDay       Get the number of days in that month int daysInMonth   mycal getActualMaximum Calendar DAY OF MONTH      28   Test  try a month in a leap year   mycal   new GregorianCalendar 2000  Calendar FEBRUARY  1   daysInMonth  mycal getActualMaximum Calendar DAY OF MONTH           29

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public class Main        private static LocalDate local LocalDate now        public static void main String   args                 int month local lengthOfMonth                System out println month

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You can use Calendar getActualMaximum method   Calendar calendar   Calendar getInstance    calendar set Calendar YEAR  year   calendar set Calendar MONTH  month   int numDays   calendar getActualMaximum Calendar DATE

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This is the mathematical way  For year  month  1 to 12   int daysInMonth   month     2      31 -    month - 1    7    2       28    year   4    0   1   0  -  year   100    0   1   0     year   400    0   1   0

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1 means Sunday  2 means Monday      7 means Saturday   month starts with 0  January   MonthDisplayHelper monthDisplayHelper   new MonthDisplayHelper 2019 4   int numbeOfDaysInMonth   monthDisplayHelper getNumberOfDaysInMonth

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Number of days in particular year - Java 8  solution Year now   length

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Code for java util Calendar  If you have to use java util Calendar  I suspect you want   int days   calendar getActualMaximum Calendar DAY OF MONTH     Code for Joda Time  Personally  however  I d suggest using Joda Time instead of java util  Calendar  Date  to start with  in which case you could use   int days   chronology dayOfMonth   getMaximumValue date     Note that rather than parsing the string values individually  it would be better to get whichever date time API you re using to parse it  In java util   you might use SimpleDateFormat  in Joda Time you d use a DateTimeFormatter

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Lets make it as simple if you don t want to hardcode the value of year and month and you want to take the value from current date and time   Date d   new Date    String myDate   new SimpleDateFormat  dd MM yyyy   format d   int iDayFromDate   Integer parseInt myDate substring 0  2    int iMonthFromDate   Integer parseInt myDate substring 3  5    int iYearfromDate   Integer parseInt myDate substring 6  10     YearMonth CurrentYear   YearMonth of iYearfromDate  iMonthFromDate   int lengthOfCurrentMonth   CurrentYear lengthOfMonth    System out println  Total number of days in current month is     lengthOfCurrentMonth

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Simple as that no need to import anything  public static int getMonthDays int month  int year        int daysInMonth       if  month    4    month    6    month    9    month    11            daysInMonth   30            else           if  month    2                daysInMonth    year   4    0    29   28            else               daysInMonth   31                      return daysInMonth

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I would go for a solution like this   int monthNr   getMonth    final Month monthEnum   Month of monthNr   int daysInMonth  if  monthNr    2        int year   getYear        final boolean leapYear   IsoChronology INSTANCE isLeapYear year       daysInMonth   monthEnum length leapYear     else       daysInMonth   monthEnum maxLength        If the month isn t February  92  of the cases   it depends on the month only and it is more efficient not to involve the year  This way  you don t have to call logic to know whether it is a leap year and you don t need to get the year in 92  of the cases  And it is still clean and very readable code

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In Java8 you can use get ValueRange from a field of a date   LocalDateTime dateTime   LocalDateTime now     ChronoField chronoField   ChronoField MONTH OF YEAR  long max   dateTime range chronoField  getMaximum      This allows you to parameterize on the field

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Following method will provide you the no of days in a particular month  public static int getNoOfDaysInAMonth String date        Calendar cal   Calendar getInstance        cal setTime date       return  cal getActualMaximum Calendar DATE

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The use of outdated Calendar API should be avoided   In Java8 or higher version  this can be done with YearMonth   Example code   int year   2011  int month   2  YearMonth yearMonth   YearMonth of year  month   int lengthOfMonth   yearMonth lengthOfMonth    System out println lengthOfMonth

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This worked fine for me   This is a Sample Output  import java util     public class DaysInMonth         public static void main String args                 Scanner input   new Scanner System in            System out print  Enter a year               int year   input nextInt      Moved here to get input after the question is asked           System out print  Enter a month              int month   input nextInt      Moved here to get input after the question is asked           int days   0    changed so that it just initializes the variable to zero         boolean isLeapYear    year   4    0  amp  amp  year   100    0      year   400    0             switch  month                 case 1                   days   31                   break               case 2                   if  isLeapYear                       days   29                   else                      days   28                   break               case 3                   days   31                   break               case 4                   days   30                   break               case 5                   days   31                   break               case 6                   days   30                   break               case 7                   days   31                   break               case 8                   days   31                   break               case 9                   days   30                   break               case 10                   days   31                   break               case 11                   days   30                   break               case 12                   days   31                   break               default                   String response    Have a Look at what you ve done and try again                   System out println response                    System exit 0                        String response    There are     days     Days in Month     month     of Year     year      n            System out println response      new line to show the result to the screen              abhinavsthakur00 gmail com

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An optimal and performant variance   public static int daysInMonth int month  int year        if  month    2            return 31 -  month - 1    7   2            else           if   year  amp  3     0  amp  amp    year   25     0     year  amp  15     0        leap year             return 29            else               return 28                      For more details on the leap algorithm check here

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You can use Calendar getActualMaximum method   Calendar calendar   Calendar getInstance    calendar set Calendar YEAR  year   calendar set Calendar MONTH  month-1   int numDays   calendar getActualMaximum Calendar DATE     And month-1 is Because of month takes its original number of month while in method takes argument as below in Calendar class  public int getActualMaximum int field       throw new RuntimeException  Stub         And the  int field  is like as below   public static final int JANUARY   0  public static final int NOVEMBER   10  public static final int DECEMBER   11

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if  month    4    month    6    month    9    month    11   daysInMonth   30   else   if  month    2    daysInMonth    leapYear    29   28   else   daysInMonth   31

[java] Number of days in particular month of particular year?

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