How to get day of the month

Question

I am trying to retrieve which day of the month it is   Such as today is August 29 2011   What i would like to do is just get the days number such as 29  or 30  Which ever day of the month it is    How would i go about doing this

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Java 8 Update  Java 8 introduces the following packages for time and date manipulation   java time    java time format     java time chono        java time temporal    java time zone      These are more organized and intuitive   We need only top two packages for the discussion  There are 3 top level classes - LocalDate  LocalTime  LocalDateTime for describing Date  Time and DateTime respectively  Although  they are formatted properly in toString    each class has format method which accepts DateTimeFormatter to format in customized way   DateTimeFormatter can also be used show the date given a day  It has few   import java time    import java time format     class DateTimeDemo      public static void main String   args           LocalDateTime x   LocalDateTime now            System out println x format DateTimeFormatter ofLocalizedDate FormatStyle FULL      Shows Day and Date           System out println x format DateTimeFormatter ofPattern  EE       Short Form         System out println x format DateTimeFormatter ofPattern  EEEE       Long Form            ofLocalizedTime accepts FormatStyle which is an enumeration in java time format  ofPattern accepts String with restricted pattern characters of restricted length  Here are the characters which can be passed into the toPattern method     You can try different number of patterns to see how the output will be   Check out more about Java 8 DateTime API here

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LocalDate date   new Date    date lengthOfMonth   or DateTimeFormatter formatter   DateTimeFormatter ofPattern  quot YYYY-MM-dd quot    DateTimeFormatter monthFormatter   DateTimeFormatter ofPattern  quot MMM quot    String stringDate   formatter format date   String month   monthFormatter format date

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The following method would help you in finding day of any specified date    public static int getDayOfMonth Date aDate        Calendar cal   Calendar getInstance        cal setTime aDate       return cal get Calendar DAY OF MONTH

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You could start by reading the documentation for Date  Then you realize that Date   s methods are all deprecated and turn to Calender instead   Calendar now   Calendar getInstance    System out println now get Calendar DAY OF MONTH

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Take a look at GregorianCalendar  something like   final Calendar now   GregorianCalendar getInstance   final int dayNumber   now get Calendar DAY OF MONTH

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It is simplified a lot in version Java 8  I have given some util methods below      To get the day of the month in the format of int for the given day  month  and year        public static int findDay final int month  final int day  final int year               System out println LocalDate of year  month  day  getDayOfMonth             return LocalDate of year  month  day  getDayOfMonth               To get current day of the month in the format of int        public static int findDay final int month  final int day  final int year               System out println LocalDate now ZoneId of  Asia Kolkata    getDayOfMonth             return LocalDate now ZoneId of  Asia Kolkata    getDayOfMonth               To get the day of the week in the format of String for the given day  month  and year        public static String findDay final int month  final int day  final int year               System out println LocalDate of year  month  day  getDayOfWeek             return LocalDate of year  month  day  getDayOfWeek   toString               To get current day of the week in the format of String        public static String findDay final int month  final int day  final int year               System out println LocalDate now ZoneId of  Asia Kolkata     getDayOfWeek             return LocalDate now ZoneId of  Asia Kolkata    getDayOfWeek   toString

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You ll want to do get a Calendar instance and get it s day of month  Calendar cal   Calendar getInstance    int dayOfMonth   cal get Calendar DAY OF MONTH    String dayOfMonthStr   String valueOf dayOfMonth     You can also get DAY OF WEEK  DAY OF YEAR  DAY OF WEEK IN MONTH  etc

User · Answer

This will get you the day of the month String valueOf  Calendar getInstance    get Calendar DAY OF MONTH

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tl dr  LocalDate              Represent a date-only  without time-of-day and without time zone   now                   Better to pass a  ZoneId  optional argument to  now  as shown below than rely implicitly on the JVM   s current default time zone   getDayOfMonth         Interrogate for the day of the month  1-31      java time  The modern approach is the LocalDate class to represent a date-only value    A time zone is crucial in determine the current date  For any given moment  the date varies around the globe by zone   ZoneId z   ZoneId of   America Montreal     LocalDate ld   LocalDate now  z     int dayOfMonth   ld getDayOfMonth      You can also get the day-of-week   DayOfWeek dow   ld getDayOfWeek        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   Using a JDBC driver compliant with JDBC 4 2 or later  you may exchange java time objects directly with your database  No need for strings nor java sql   classes   Where to obtain the java time classes     Java SE 8  Java SE 9  and later   Built-in   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   Much 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  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     Joda-Time  UPDATE  The Joda-Time project is now in maintenance mode  and advises migration to the java time classes  This section left intact for history   Using the Joda-Time 2 5 library rather than the notoriously troublesome java util Date and  Calendar classes    Time zone is crucial to determining a date  Better to specify the zone rather than rely implicitly on the JVM   s current default time zone being assigned   DateTimeZone zone   DateTimeZone forID   America Montreal     DateTime now   DateTime now  zone   withTimeAtStartOfDay    int dayOfMonth   now getDayOfMonth      Or use similar code with the LocalDate class that has no time-of-day portion

[java] How to get day of the month?

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