Getting last day of the month in a given string date

Question

My input string date is as below   String date    1 13 2012     I am getting the month as below   SimpleDateFormat dateFormat   new SimpleDateFormat  MM dd yyyy    Date convertedDate   dateFormat parse date   String month   new SimpleDateFormat  MM   format convertedDate     But how do I get the last calendar day of the month in a given String date   E g   for a String  1 13 2012  the output must be  1 31 2012

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The simplest way is to construt a new GregorianCalendar instance  see below   Calendar cal   new GregorianCalendar 2013  5  0   Date date   cal getTime    DateFormat sdf   new SimpleDateFormat  yyyy-MM-dd    System out println  Date       sdf format date      Output   Date   2013-05-31   Attention      month the value used to set the MONTH calendar field in the calendar  Month value is 0-based e g  0 for January

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String givenStringDate   07 16 2020           DateTimeFormatter formatter   DateTimeFormatter ofPattern  MM dd yyyy            java util Date convertedUtillDate                                If your output requirement is in LocalDate format use below snippet                                             LocalDate localDate  LocalDate parse givenStringDate  formatter               LocalDate localDateLastDayOfMonth   localDate with TemporalAdjusters lastDayOfMonth                                    If your output requirement is in Calendar format use below snippet                                             convertedUtillDate   Date from localDate atStartOfDay ZoneId systemDefault    toInstant                 Calendar calendarLastDayOfMonth   Calendar getInstance                calendarLastDayOfMonth setTime convertedUtillDate               int lastDate   calendarLastDayOfMonth getActualMaximum Calendar DATE               calendarLastDayOfMonth set Calendar DATE  lastDate     Tested in Java 1 8  I hope this will help some one

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Java 8 and above  import java time LocalDate  import java time Year   static int lastDayOfMonth int Y  int M        return LocalDate of Y  M  1  getMonth   length Year of Y  isLeap        subject to Basil Bourque s comment import java time YearMonth   int lastDayOfMonth   YearMonth of Y  M  lengthOfMonth

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This looks like your needs   http   obscuredclarity blogspot de 2010 08 get-last-day-of-month-date-object-in html  code   import java text DateFormat    import java text DateFormat    import java text SimpleDateFormat    import java util Calendar    import java util Date       Java 1 4  Compatible           The following example code demonstrates how to get      a Date object representing the last day of the month      relative to a given Date object     public class GetLastDayOfMonth          public static void main String   args               Date today   new Date               Calendar calendar   Calendar getInstance              calendar setTime today              calendar add Calendar MONTH  1             calendar set Calendar DAY OF MONTH  1             calendar add Calendar DATE  -1              Date lastDayOfMonth   calendar getTime               DateFormat sdf   new SimpleDateFormat  yyyy-MM-dd              System out println  Today                  sdf format today              System out println  Last Day of Month      sdf format lastDayOfMonth                    Output   Today              2010-08-03   Last Day of Month  2010-08-31

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Java 8 and above   By using convertedDate getMonth   length convertedDate isLeapYear    where convertedDate is an instance of LocalDate   String date    1 13 2012   LocalDate convertedDate   LocalDate parse date  DateTimeFormatter ofPattern  M d yyyy     convertedDate   convertedDate withDayOfMonth                                  convertedDate getMonth   length convertedDate isLeapYear        Java 7 and below   By using getActualMaximum method of java util Calendar   String date    1 13 2012   SimpleDateFormat dateFormat   new SimpleDateFormat  MM dd yyyy    Date convertedDate   dateFormat parse date   Calendar c   Calendar getInstance    c setTime convertedDate   c set Calendar DAY OF MONTH  c getActualMaximum Calendar DAY OF MONTH

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Works fine for me with this       Calendar cal   Calendar getInstance TimeZone getTimeZone         cal set Calendar MONTH  month-1         cal set Calendar YEAR  year         cal add Calendar DATE  -1         cal set Calendar DAY OF MONTH       cal getActualMaximum Calendar DAY OF MONTH        cal set Calendar HOUR OF DAY  0       cal set Calendar MINUTE  0       cal set Calendar SECOND  0       cal set Calendar MILLISECOND  0       return cal getTimeInMillis

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You can use the following code to get last day of the month  public static String getLastDayOfTheMonth String date            String lastDayOfTheMonth                SimpleDateFormat formatter   new SimpleDateFormat  dd-MM-yyyy            try          java util Date dt  formatter parse date           Calendar calendar   Calendar getInstance              calendar setTime dt              calendar add Calendar MONTH  1             calendar set Calendar DAY OF MONTH  1             calendar add Calendar DATE  -1              java util Date lastDay   calendar getTime               lastDayOfTheMonth   formatter format lastDay             catch  ParseException e                e printStackTrace                      return lastDayOfTheMonth

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public static String getLastDayOfMonth int year  int month  throws Exception      DateFormat sdf   new SimpleDateFormat  yyyy-MM-dd         Date date   sdf parse year  -   month lt 10   0  month  month   -01         Calendar calendar   Calendar getInstance        calendar setTime date        calendar add Calendar MONTH  1       calendar set Calendar DAY OF MONTH  1       calendar add Calendar DATE  -1        Date lastDayOfMonth   calendar getTime         return sdf format lastDayOfMonth     public static void main String   args  throws Exception      System out println  Last Day of Month      getLastDayOfMonth 2017  1        System out println  Last Day of Month      getLastDayOfMonth 2017  2        System out println  Last Day of Month      getLastDayOfMonth 2017  3        System out println  Last Day of Month      getLastDayOfMonth 2017  4        System out println  Last Day of Month      getLastDayOfMonth 2017  5        System out println  Last Day of Month      getLastDayOfMonth 2017  6        System out println  Last Day of Month      getLastDayOfMonth 2017  7        System out println  Last Day of Month      getLastDayOfMonth 2017  8        System out println  Last Day of Month      getLastDayOfMonth 2017  9        System out println  Last Day of Month      getLastDayOfMonth 2017  10        System out println  Last Day of Month      getLastDayOfMonth 2017  11        System out println  Last Day of Month      getLastDayOfMonth 2017  12        System out println  Last Day of Month      getLastDayOfMonth 2018  1        System out println  Last Day of Month      getLastDayOfMonth 2018  2        System out println  Last Day of Month      getLastDayOfMonth 2018  3         System out println  Last Day of Month      getLastDayOfMonth 2010  2        System out println  Last Day of Month      getLastDayOfMonth 2011  2        System out println  Last Day of Month      getLastDayOfMonth 2012  2        System out println  Last Day of Month      getLastDayOfMonth 2013  2        System out println  Last Day of Month      getLastDayOfMonth 2014  2        System out println  Last Day of Month      getLastDayOfMonth 2015  2        System out println  Last Day of Month      getLastDayOfMonth 2016  2        System out println  Last Day of Month      getLastDayOfMonth 2017  2        System out println  Last Day of Month      getLastDayOfMonth 2018  2        System out println  Last Day of Month      getLastDayOfMonth 2019  2        System out println  Last Day of Month      getLastDayOfMonth 2020  2        System out println  Last Day of Month      getLastDayOfMonth 2021  2        output      Last Day of Month  2017-01-31 Last Day of Month  2017-02-28   Last Day of Month  2017-03-31 Last Day of Month  2017-04-30   Last Day of Month  2017-05-31 Last Day of Month  2017-06-30   Last Day of Month  2017-07-31 Last Day of Month  2017-08-31   Last Day of Month  2017-09-30 Last Day of Month  2017-10-31   Last Day of Month  2017-11-30 Last Day of Month  2017-12-31   Last Day of Month  2018-01-31 Last Day of Month  2018-02-28   Last Day of Month  2018-03-31 Last Day of Month  2010-02-28   Last Day of Month  2011-02-28 Last Day of Month  2012-02-29   Last Day of Month  2013-02-28 Last Day of Month  2014-02-28   Last Day of Month  2015-02-28 Last Day of Month  2016-02-29   Last Day of Month  2017-02-28 Last Day of Month  2018-02-28   Last Day of Month  2019-02-28 Last Day of Month  2020-02-29   Last Day of Month  2021-02-28

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tl dr  YearMonth                                              Represent the year and month  without a date and without a time zone   from                                                  Extract the year and month from a  LocalDate   a year-month-day        LocalDate                                          Represent a date without a time-of-day and without a time zone       parse                                             Get a date from an input string                   1 13 2012                                     Poor choice of format for a date  Educate the source of your data about the standard ISO 8601 formats to be used when exchanging date-time values as text          DateTimeFormatter ofPattern   M d uuuu         Specify a formatting pattern by which to parse the input string                                                         Returns a  LocalDate  object                                                         Returns a  YearMonth  object   atEndOfMonth                                          Determines the last day of the month for that particular year-month  and returns a  LocalDate  object   toString                                              Generate text representing the value of that  LocalDate  object using standard ISO 8601 format    See this code run live at IdeOne com      2012-01-31   YearMonth  The YearMonth class makes this easy  The atEndOfMonth method returns a LocalDate  Leap year in February is accounted for    First define a formatting pattern to match your string input   DateTimeFormatter f   DateTimeFormatter ofPattern   M d uuuu       Use that formatter to get a LocalDate from the string input   String s    1 13 2012    LocalDate ld   LocalDate parse   1 13 2012    f       Then extract a YearMonth object   YearMonth ym   YearMonth from  ld       Ask that YearMonth to determine the last day of its month in that year  accounting for Leap Year in February   LocalDate endOfMonth   ym atEndOfMonth       Generate text representing that date  in standard ISO 8601 format   String output   endOfMonth toString           About java time  The java time framework is built into Java 8 and later  These classes supplant the troublesome old legacy date-time classes such as java util Date  Calendar   amp  SimpleDateFormat   The Joda-Time project  now in maintenance mode  advises migration to the java time classes   To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310   You may exchange java time objects directly with your database  Use a JDBC driver compliant with JDBC 4 2 or later  No need for strings  no need for java sql   classes   Where to obtain the java time classes     Java SE 8  Java SE 9  Java SE 10  Java SE 11  and later  - Part of the standard Java API with a bundled implementation    Java 9 adds some minor features and fixes   Java SE 6 and Java SE 7   Most of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   Later versions of Android bundle implementations of the java time classes  For earlier Android   lt 26   the ThreeTenABP project adapts ThreeTen-Backport  mentioned above   See How to use ThreeTenABP        The ThreeTen-Extra project extends java time with additional classes  This project is a proving ground for possible future additions to java time  You may find some useful classes here such as Interval  YearWeek  YearQuarter  and more

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I use this one-liner on my JasperServer Reports   new SimpleDateFormat  yyyy-MM-dd   format new SimpleDateFormat  yyyy-MM-dd   parse new java util Date   format  yyyy      -     new Integer  new SimpleDateFormat  MM   format new Date     1     -01  -1    Doesn t look nice but works for me  Basically it s adding 1 to the current month  get the first day of that month and subtract one day

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You can make use of the plusMonths and minusDays methods in Java 8      Parse your date into a LocalDate LocalDate parsed   LocalDate parse  1 13 2012   DateTimeFormatter ofPattern  M d yyyy         We only care about its year and month  set the date to first date of that month LocalDate localDate   LocalDate of parsed getYear    parsed getMonth    1       Add one month  subtract one day  System out println localDate plusMonths 1  minusDays 1       2012-01-31

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With Java 8 DateTime   LocalDateTime     String dateString    01 13 2012   DateTimeFormatter dateFormat   DateTimeFormatter ofPattern  MM dd yyyy   Locale US    LocalDate date   LocalDate parse dateString  dateFormat          ValueRange range   date range ChronoField DAY OF MONTH   Long max   range getMaximum    LocalDate newDate   date withDayOfMonth max intValue     System out println newDate         OR   String dateString    01 13 2012   DateTimeFormatter dateFormat   DateTimeFormatter ofPattern  MM dd yyyy   Locale US    LocalDate date   LocalDate parse dateString  dateFormat   LocalDate newDate   date withDayOfMonth date getMonth   length date isLeapYear      System out println newDate     Output   2012-01-31      LocalDateTime should be used instead of LocalDate if you have time information in your date string   I E  2015 07 22 16 49

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Use GregorianCalendar  Set the date of the object  and then use getActualMaximum Calendar DAY IN MONTH    http   docs oracle com javase 7 docs api java util GregorianCalendar html getActualMaximum 28int 29  but it was the same in Java 1 4

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By using java 8 java time LocalDate  String date    1 13 2012   LocalDate lastDayOfMonth   LocalDate parse date  DateTimeFormatter ofPattern  M dd yyyy            with TemporalAdjusters lastDayOfMonth

[java] Getting last day of the month in a given string date

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