java util Date and getYear

Question

I am having the following problem in Java  I see some people are having a similar problem in JavaScript but I m using Java   System out println new Date   getYear     System out println new GregorianCalendar   getTime   getYear     System out println this sale getSaleDate   getYear     System out println this sale getSaleDate   getMonth     System out println this sale getSaleDate   getDate       returns  I System out  4274   112 I System out  4274   112 I System out  4274   112 I System out  4274   1 I System out  4274   11   I don t understand the 112 bit which I thought would have been 2012  What s going on  Is the java util Date class unusable  I am storing this as a field in several of my classes to store a date and time  What should I do

User · Answer

Use date format  SimpleDateFormat format   new SimpleDateFormat  yyyy-MM-dd HH mm ss    Date date   format parse datetime   SimpleDateFormat df   new SimpleDateFormat  yyyy    year   df format date

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There are may ways of getting day  month and year in java   You may use any-      Date date1   new Date        String mmddyyyy1   new SimpleDateFormat  MM-dd-yyyy   format date1       System out println  Formatted Date 1      mmddyyyy1          Date date2   new Date        Calendar calendar1   new GregorianCalendar        calendar1 setTime date2       int day1     calendar1 get Calendar DAY OF MONTH       int month1   calendar1 get Calendar MONTH    1      0 - 11      int year1    calendar1 get Calendar YEAR       String mmddyyyy2     month1 lt 10   0  month1 month1     -      day1 lt 10   0  day1 day1     -     year1       System out println  Formatted Date 2      mmddyyyy2          LocalDateTime ldt1   LocalDateTime now          DateTimeFormatter format1   DateTimeFormatter ofPattern  MM-dd-yyyy          String mmddyyyy3   ldt1 format format1         System out println  Formatted Date 3      mmddyyyy3            LocalDateTime ldt2   LocalDateTime now        int day2   ldt2 getDayOfMonth        int mont2  ldt2 getMonthValue        int year2  ldt2 getYear        String mmddyyyy4     mont2 lt 10   0  mont2 mont2     -      day2 lt 10   0  day2 day2     -     year2       System out println  Formatted Date 4      mmddyyyy4          LocalDateTime ldt3   LocalDateTime of 2020  6  11  14  30      int year  int month  int dayOfMonth  int hour  int minute     DateTimeFormatter format2   DateTimeFormatter ofPattern  MM-dd-yyyy          String mmddyyyy5   ldt3 format format2          System out println  Formatted Date 5      mmddyyyy5           Calendar calendar2   Calendar getInstance        calendar2 setTime new Date         int day3    calendar2 get Calendar DAY OF MONTH      OR Calendar DATE     int month3  calendar2 get Calendar MONTH    1      int year3   calendar2 get Calendar YEAR       String mmddyyyy6     month3 lt 10   0  month3 month3     -      day3 lt 10   0  day3 day3     -     year3       System out println  Formatted Date 6      mmddyyyy6          Date date3   new Date        LocalDate ld1   LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date3       Accepts only yyyy-MM-dd     int day4    ld1 getDayOfMonth        int month4  ld1 getMonthValue        int year4   ld1 getYear        String mmddyyyy7     month4 lt 10   0  month4 month4     -      day4 lt 10   0  day4 day4     -     year4       System out println  Formatted Date 7      mmddyyyy7          Date date4   new Date        int day5     LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date4   getDayOfMonth        int month5   LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date4   getMonthValue        int year5    LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date4   getYear        String mmddyyyy8     month5 lt 10   0  month5 month5     -      day5 lt 10   0  day5 day5     -     year5       System out println  Formatted Date 8      mmddyyyy8          Date date5   new Date        int day6     Integer parseInt new SimpleDateFormat  dd   format date5        int month6   Integer parseInt new SimpleDateFormat  MM   format date5        int year6    Integer parseInt new SimpleDateFormat  yyyy   format date5        String mmddyyyy9     month6 lt 10   0  month6 month6     -      day6 lt 10   0  day6 day6     -     year6       System out println  Formatted Date 9      mmddyyyy9

User · Answer

The java documentation suggests to make use of Calendar class instead of this deprecated way Here is the sample code to set up the calendar object  Calendar calendar   Calendar getInstance    calendar setTime new Date       Here is the sample code to get the year  month  etc   System out println calendar get Calendar YEAR    System out println calendar get Calendar MONTH      Calendar also has support for many other useful information like  TIME  DAY OF MONTH  etc  Here the documentation listing all of them Please note that the month are 0 based  January is 0th month

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Year now    There s an easier way to use the java time library in Java 8    The expression   java time Year now   getValue     returns the current year as a four-digit int  using your default time zone   There are lots of options for different time ZoneIds  Calendars and Clocks  but I think this is what you will want most of the time   If you want the code to look cleaner  and don t need any other java time   now   functions   put   import static java time Year now    at the top of your file  and call   now   getValue     as needed

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This behavior is documented in the java util Date -class documentation      Returns a value that is the result of subtracting 1900 from the year   that contains or begins with the instant in time represented by this   Date object  as interpreted in the local time zone    It is also marked as deprecated  Use java util Calendar instead

User · Answer

Yup  this is in fact what s happening  See also the Javadoc    Returns     the year represented by this date  minus 1900     The getYear method is deprecated for this reason  So  don t use it   Note also that getMonth returns a number between 0 and 11  Therefore  this sale getSaleDate   getMonth   returns 1 for February  instead of 2  While java util Calendar doesn t add 1900 to all years  it does suffer from the off-by-one-month problem   You re much better off using JodaTime

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Java 8 LocalDate class is another option to get the year from a java util Date   int year   LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date   getYear      Another option is   int year   Integer parseInt new SimpleDateFormat  yyyy   format date

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tl dr  LocalDate now            Capture the date-only value current in the JVM   s current default time zone            getYear        Extract the year number from that date       2018   java time  Both the java util Date and java util Calendar classes are legacy  now supplanted by the java time framework built into Java 8 and later    A time zone is crucial in determining a date  For any given moment  the date varies around the globe by zone  For example  a few minutes after midnight in Paris France is a new day while still    yesterday    in Montr  al Qu  bec   If no time zone is specified  the JVM implicitly applies its current default time zone  That default may change at any moment  so your results may vary  Better to specify your desired expected time zone explicitly as an argument   Specify a proper time zone name in the format of continent region  such as America Montreal  Africa Casablanca  or Pacific Auckland  Never use the 3-4 letter abbreviation such as EST or IST as they are not true time zones  not standardized  and not even unique       ZoneId z   ZoneId of   Africa Tunis          If you want only the date without time-of-day  use LocalDate  This class lacks time zone info but you can specify a time zone to determine the current date   ZoneId zoneId   ZoneId of   America Montreal     LocalDate localDate   LocalDate now  zoneId      You can get the various pieces of information with getYear  getMonth  and getDayOfMonth  You will actually get the year number with java time   int year   localDate getYear         2016   If you want a date-time instead of just a date  use ZonedDateTime class   ZonedDateTime zdt   ZonedDateTime now  zoneId         About java time  The java time framework is built into Java 8 and later  These classes supplant the troublesome old date-time classes such as java util Date   Calendar   amp  java text 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   Much of the java time functionality is back-ported to Java 6  amp  Java 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP  see How to use       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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In addition to all the comments  I thought I might add some code on how to use java util Date  java util Calendar and java util GregorianCalendar according to the javadoc     Initialize your Date however you like it  Date date   new Date    Calendar calendar   new GregorianCalendar    calendar setTime date   int year   calendar get Calendar YEAR     Add one to month  0 - 11  int month   calendar get Calendar MONTH    1  int day   calendar get Calendar DAY OF MONTH

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Don t use Date  use Calendar      Beware  months are zero-based and no out of range errors are reported Calendar date   new GregorianCalendar 2012  9  5   int year   date get Calendar YEAR       2012 int month   date get Calendar MONTH       9 - October    int day   date get Calendar DAY OF MONTH       5   It supports time as well   Calendar dateTime   new GregorianCalendar 2012  3  4  15  16  17   int hour   dateTime get Calendar HOUR OF DAY       15 int minute   dateTime get Calendar MINUTE       16 int second   dateTime get Calendar SECOND       17

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According to javadocs    Deprecated public int getYear     Deprecated   As of JDK version 1 1  replaced by Calendar get Calendar YEAR  - 1900   Returns a value that is the result of subtracting 1900 from the year that contains or begins with the instant in time represented by this Date object  as interpreted in the local time zone   Returns  the year represented by this date  minus 1900   See Also  Calendar  So 112 is the correct output  I would follow the advice in the Javadoc or use JodaTime instead

User · Answer

try   int year   Integer parseInt new Date   toString   split  -   0        catch NumberFormatException e       Much of Date is deprecated

[java] java.util.Date and getYear()

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