How to determine day of week by passing specific date

Question

For Example I have the date   23 2 2010   23th Feb 2010   I want to pass it to a function which would return the day of week  How can I do this   In this example  the function should return String  Tue    Additionally  if just the day ordinal is desired  how can that be retrieved

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to get day of any date  import java util Scanner   import java util Calendar   import java util Date   public class Show        public static String getDay String day String month  String year                 String input date   month     day     year               Date now   new Date input date               Calendar calendar   Calendar getInstance                calendar setTime now               int final day    calendar get Calendar DAY OF WEEK                 String finalDay     SUNDAY   MONDAY   TUESDAY   WEDNESDAY   THURSDAY   FRIDAY   SATURDAY                 System out println finalDay final day-1                public static void main String   args                 Scanner in   new Scanner System in                String month   in next             String day   in next                String year   in next                 getDay day  month  year

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You can try the following code   import java time     public class Test     public static void main String   args          DayOfWeek dow   LocalDate of 2010 Month FEBRUARY 23  getDayOfWeek          String s   String valueOf dow         System out println String format    3s  s

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Yes   Depending on your exact case    You can use java util Calendar   Calendar c   Calendar getInstance    c setTime yourDate   int dayOfWeek   c get Calendar DAY OF WEEK    if you need the output to be Tue rather than 3  Days of week are indexed starting at 1 for Sunday  see Calendar SUNDAY   instead of going through a calendar  just reformat the string   new SimpleDateFormat  EE   format date   EE meaning  day of week  short version   if you have your input as string  rather than Date  you should use SimpleDateFormat to parse it  new SimpleDateFormat  dd M yyyy   parse dateString  you can use joda-time s DateTime and call dateTime dayOfWeek   and or DateTimeFormat  edit  since Java 8 you can now use java time package instead of joda-time

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There is a challenge on hackerrank Java Date and Time  personally  I prefer the LocalDate class   Import java time LocalDate Retrieve localDate by using  quot of quot  method which takes 3 arguments in  quot int quot  format  finally  get the name of that day using  quot getDayOfWeek quot  method   There is one video on this challenge  Java Date and Time Hackerrank solution I hope it will help

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import java text SimpleDateFormat  import java util Scanner   class DayFromDate        public static void main String args               System out println  Enter the date dd mm yyyy              Scanner scan   new Scanner System in           String Date   scan nextLine             try               boolean dateValid   dateValidate Date                if dateValid    true                    SimpleDateFormat df   new SimpleDateFormat   dd MM yy                       java util Date date   df parse  Date                       df applyPattern   EEE                       String day  df format  date                      if day compareTo  Sat      0    day compareTo  Sun      0                        System out println day      Weekend                      else                       System out println day      Weekday                                    else                   System out println  Invalid Date                               catch Exception e                System out println  Invalid Date Formats                             static public boolean dateValidate String d             String dateArray     d split               int day   Integer parseInt dateArray 0            int month   Integer parseInt dateArray 1            int year   Integer parseInt dateArray 2            System out print day     n    month     n    year     n            boolean leapYear   false           if  year   4    0   amp  amp   year   100    0      year   400    0                 leapYear   true                     if year  gt  2099    year  lt  1900              return false           if month  lt  13                if month    1    month    3    month    5    month    7    month    8    month    10    month    12                    if day  gt  31                      return false                else if month    4    month    6    month    9    month    11                    if day  gt  30                      return false                else if leapYear    true  amp  amp  month    2                    if day  gt  29                      return false                else if leapYear    false  amp  amp  month    2                    if day  gt  28                      return false                             return true                else return false

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Below is the two line of snippet using Java 1 8 Time API for your Requirement   LocalDate localDate   LocalDate of Integer valueOf year  Integer valueOf month  Integer valueOf day    String dayOfWeek   String valueOf localDate getDayOfWeek

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For Java 8 or Later  Localdate is preferable  import java time LocalDate   public static String findDay int month  int day  int year         LocalDate localDate   LocalDate of year  month  day        java time DayOfWeek dayOfWeek   localDate getDayOfWeek        System out println dayOfWeek        return dayOfWeek toString        Note   if input is String User defined  then you should parse it into int

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tl dr  Using java time     LocalDate parse                                   Generate  LocalDate  object from String input                23 2 2010                 DateTimeFormatter ofPattern   d M uuuu                                                              getDayOfWeek                            Get  DayOfWeek  enum object            getDisplayName                          Localize  Generate a String to represent this day-of-week               TextStyle SHORT STANDALONE           How long or abbreviated  Some languages have an alternate spelling for  standalone  use  not so in English                Locale US                            Or Locale CANADA FRENCH and such  Specify a  Locale  to determine  1  human language for translation  and  2  cultural norms for abbreviation  punctuation  etc                   Tue   See this code run live at IdeOne com  but only Locale US works there    java time  See my example code above  and see the correct Answer for java time by Przemek   Ordinal number     if just the day ordinal is desired  how can that be retrieved    For ordinal number  consider passing around the DayOfWeek enum object instead such as DayOfWeek TUESDAY  Keep in mind that a DayOfWeek is a smart object  not just a string or mere integer number  Using those enum objects makes your code more self-documenting  ensures valid values  and provides type-safety    But if you insist  ask DayOfWeek for a number  You get 1-7 for Monday-Sunday per the ISO 8601 standard   int ordinal   myLocalDate getDayOfWeek   getValue         Joda-Time  UPDATE  The Joda-Time project is now in maintenance mode  The team advises migrating to the java time classes  The java time framework is built into Java 8  as well as back-ported to Java 6  amp  7 and further adapted to Android     Here is example code using the Joda-Time library version 2 4  as mentioned in the accepted answer by Bozho  Joda-Time is far superior to the java util Date  Calendar classes bundled with Java   LocalDate  Joda-Time offers the LocalDate class to represent a date-only without any time-of-day or time zone  Just what this Question calls for  The old java util Date  Calendar classes bundled with Java lack this concept   Parse  Parse the string into a date value   String input    23 2 2010   DateTimeFormatter formatter   DateTimeFormat forPattern   d M yyyy     LocalDate localDate   formatter parseLocalDate  input      Extract  Extract from the date value the day of week number and name    int dayOfWeek   localDate getDayOfWeek       Follows ISO 8601 standard  where Monday   1  Sunday   7  Locale locale   Locale US      Locale specifies the human language to use in determining day-of-week name  Tuesday in English versus Mardi in French   DateTimeFormatter formatterOutput   DateTimeFormat forPattern   E    withLocale  locale    String output   formatterOutput print  localDate        E  is code for abbreviation of day-of-week name  See Joda-Time doc  String outputQu  b  cois   formatterOutput withLocale  Locale CANADA FRENCH   print  localDate      Dump  Dump to console   System out println   input      input    System out println   localDate      localDate       Defaults to ISO 8601 formatted strings  System out println   dayOfWeek      dayOfWeek    System out println   output      output    System out println   outputQu  b  cois      outputQu  b  cois      Run  When run   input  23 2 2010 localDate  2010-02-23 dayOfWeek  2 output  Tue outputQu  b  cois  mar      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   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   The ThreeTenABP project adapts ThreeTen-Backport  mentioned above  for Android specifically  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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Another  fun  way is to use Doomsday algorithm  It s a way longer method but it s also faster if you don t need to create a Calendar object with a given date   import java text ParseException  import java text SimpleDateFormat  import java util ArrayList  import java util Calendar  import java util HashMap  import java util Map  import java util Random              author alain janinmanificat     public class Doomsday        public static HashMap lt Integer  ArrayList lt Integer gt  gt  anchorDaysMap   new HashMap lt  gt         public static HashMap lt Integer  Integer gt  doomsdayDate   new HashMap lt  gt         public static String weekdays     new DateFormatSymbols Locale FRENCH  getWeekdays                     param args the command line arguments             public static void main String   args  throws ParseException  ParseException               Map is fed manually but we can use this to calculate it   http   en wikipedia org wiki Doomsday rule Finding a century 27s anchor day         anchorDaysMap put Integer valueOf 0   new ArrayList lt Integer gt                                    add Integer valueOf 1700                    add Integer valueOf 2100                    add Integer valueOf 2500                                       anchorDaysMap put Integer valueOf 2   new ArrayList lt Integer gt                                    add Integer valueOf 1600                    add Integer valueOf 2000                    add Integer valueOf 2400                                       anchorDaysMap put Integer valueOf 3   new ArrayList lt Integer gt                                    add Integer valueOf 1500                    add Integer valueOf 1900                    add Integer valueOf 2300                                       anchorDaysMap put Integer valueOf 5   new ArrayList lt Integer gt                                    add Integer valueOf 1800                    add Integer valueOf 2200                    add Integer valueOf 2600                                         Some reference date that always land on Doomsday         doomsdayDate put Integer valueOf 1   Integer valueOf 3            doomsdayDate put Integer valueOf 2   Integer valueOf 14            doomsdayDate put Integer valueOf 3   Integer valueOf 14            doomsdayDate put Integer valueOf 4   Integer valueOf 4            doomsdayDate put Integer valueOf 5   Integer valueOf 9            doomsdayDate put Integer valueOf 6   Integer valueOf 6            doomsdayDate put Integer valueOf 7   Integer valueOf 4            doomsdayDate put Integer valueOf 8   Integer valueOf 8            doomsdayDate put Integer valueOf 9   Integer valueOf 5            doomsdayDate put Integer valueOf 10   Integer valueOf 10            doomsdayDate put Integer valueOf 11   Integer valueOf 7            doomsdayDate put Integer valueOf 12   Integer valueOf 12             long time   System currentTimeMillis            for  int i   0  i  lt  100000  i                     Get a random date             int year   1583   new Random   nextInt 500               int month   1   new Random   nextInt 12               int day   1   new Random   nextInt 7                  Get anchor day and DoomsDay for current date             int twoDigitsYear    year   100               int century   year - twoDigitsYear              int adForCentury   getADCentury century               int dd     int  twoDigitsYear   12    twoDigitsYear   12    int    twoDigitsYear   12    4                  Get the gap between current date and a reference DoomsDay date             int referenceDay   doomsdayDate get month               int gap    day - referenceDay    7               int result    gap   adForCentury   dd    7               if result lt 0                   result  -1                            String dayDate  weekdays  result   1    8                 System out println  day     dayDate                     System out println  time  ms         System currentTimeMillis   - time      time  ms    80           time   System currentTimeMillis            for  int i   0  i  lt  100000  i                  Calendar c   Calendar getInstance                  I should have used random date here too  but it s already slower this way             c setTime new SimpleDateFormat  dd MM yyyy   parse  12 04 1861                   System out println new SimpleDateFormat  EE   format c getTime                  int result2   c get Calendar DAY OF WEEK                 System out println  day idx     result2                     System out println  time  ms         System currentTimeMillis   - time      time  ms    884            public static int getADCentury int century            for  Map Entry lt Integer  ArrayList lt Integer gt  gt  entry   anchorDaysMap entrySet                  if  entry getValue   contains Integer valueOf century                      return entry getKey                                    return 0

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private String getDay Date date        SimpleDateFormat simpleDateFormat   new SimpleDateFormat  EEEE          System out println  DAY   simpleDateFormat format date  toUpperCase                                return simpleDateFormat format date  toUpperCase       private String getDay String dateStr         dateStr must be in DD-MM-YYYY Formate     Date date   null      String day null       try           date   new SimpleDateFormat  DD-MM-YYYY   parse dateStr            SimpleDateFormat simpleDateFormat   new SimpleDateFormat  EEEE              System out println  DAY   simpleDateFormat format date  toUpperCase             day   simpleDateFormat format date  toUpperCase            catch  ParseException e               TODO Auto-generated catch block         e printStackTrace                return day

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Adding another way of doing it exactly what the OP asked for  without using latest inbuilt methods   public static String getDay String inputDate        String dayOfWeek   null      String   days   new String    Mon    Tue    Wed    Thu    Fri    Sat    Sun         try           SimpleDateFormat format1   new SimpleDateFormat  dd MM yyyy            Date dt1   format1 parse inputDate           dayOfWeek   days dt1 getDay   - 1         catch Exception e            System out println e              return dayOfWeek

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Calendar class has build-in displayName functionality   Calendar getInstance   getDisplayName Calendar DAY OF WEEK  Calendar SHORT  Locale getDefault        Thu     Calendar SHORT - gt  Thu Calendar LONG FORMAT - gt  Thursday   Available since Java 1 6   See also Oracle documentation

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You can use below method to get Day of the Week by passing a specific date   Here for the set method of Calendar class  Tricky part is the index for the month parameter will starts from 0   public static String getDay int day  int month  int year             Calendar cal   Calendar getInstance             if month  1               cal set year 0 day            else              cal set year month-1 day                      int dow   cal get Calendar DAY OF WEEK            switch  dow            case 1              return  SUNDAY           case 2              return  MONDAY           case 3              return  TUESDAY           case 4              return  WEDNESDAY           case 5              return  THURSDAY           case 6              return  FRIDAY           case 7              return  SATURDAY           default              System out println  GO To Hell                           return null

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Can use the following code snippet for input like  day    08    month    05   year    2015  and output will be  WEDNESDAY    Calendar calendar   Calendar getInstance    calendar set Calendar DAY OF MONTH  Integer parseInt day    calendar set Calendar MONTH   Integer parseInt month -1    calendar set Calendar YEAR  Integer parseInt year    String dayOfWeek   calendar getDisplayName Calendar DAY OF WEEK  Calendar LONG  Locale US  toUpperCase

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String input date  01 08 2012     SimpleDateFormat format1 new SimpleDateFormat  dd MM yyyy      Date dt1 format1 parse input date     DateFormat format2 new SimpleDateFormat  EEEE       String finalDay format2 format dt1     Use this code for find the Day name from a input date Simple and well tested

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Program to find the day of the week by giving user input date month and year using java util scanner package   import java util Scanner   public class Calender       public static String getDay String day  String month  String year             int ym  yp  d  ay  a   0          int by   20          int   y   new int   6  4  2  0           int   m   new int    0  3  3  6  1  4  6  2  5  0  3  5            String   wd     Sunday    Monday    Tuesday    Wednesday    Thursday    Friday    Saturday             int gd   Integer parseInt day           int gm   Integer parseInt month           int gy   Integer parseInt year            ym   gy   100          yp   ym   4          ay   gy   100           while  ay    by                by   by   1              a   a   1               if a    4                    a   0                                   if   ym   4    0   amp  amp   gm    2                 d    gd   m gm - 1    ym   yp   y a  - 1    7            else             d    gd   m gm - 1    ym   yp   y a     7           return wd d              public static void main String   args             Scanner in   new Scanner System in            String day   in next            String month   in next            String year   in next             System out println getDay day  month  year

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Calendar cal   Calendar getInstance desired date   cal setTimeInMillis System currentTimeMillis     int dayOfWeek   cal get Calendar DAY OF WEEK     Get the day value by providing the current time stamp

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java time  Using java time framework built into Java 8 and later   The DayOfWeek enum can generate a String of the day   s name automatically localized to the human language and cultural norms of a Locale  Specify a TextStyle to indicate you want long form or abbreviated name   import java time LocalDate import java time format DateTimeFormatter import java time format TextStyle import java util Locale import java time DayOfWeek   DateTimeFormatter formatter   DateTimeFormatter ofPattern  d M yyyy    LocalDate date   LocalDate parse  23 2 2010   formatter      LocalDate   2010-02-23 DayOfWeek dow   date getDayOfWeek        Extracts a  DayOfWeek  enum object  String output   dow getDisplayName TextStyle SHORT  Locale US      String   Tue

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import java time LocalDate        String month   in next    int mm   in nextInt      String day   in next    int dd   in nextInt      String year   in next    int yy   in nextInt    in close    LocalDate dt   LocalDate of yy  mm  dd   System out print dt getDayOfWeek

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This works correctly     java time LocalDate    package related to time and date   It provides inbuilt method getDayOfWeek   to get the day of a particular week   int t  Scanner s   new Scanner System in   t   s nextInt    s nextLine     while t-- gt 0         int d  m  y      String ss   s nextLine        String   sss   ss split           d Integer parseInt sss 0        m   Integer parseInt sss 1        y   Integer parseInt sss 2         LocalDate l   LocalDate of y  m  d     method to get the localdate instance     System out println l getDayOfWeek       this returns the enum DayOfWeek   To assign the value of enum l getDayOfWeek   to a string  you could probably use the method of Enum called name   that returns the value of enum object

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LocalDate date LocalDate now     System out println date getDayOfWeek      prints THURSDAY System out println date getDayOfWeek   getDisplayName TextStyle SHORT  Locale US        prints Thu    java time DayOfWeek is a enum which returns the singleton instance for the day-of-week of the weekday of the date

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One line answer   return LocalDate parse  06 02 2018  DateTimeFormatter ofPattern  dd MM yyyy    getDayOfWeek   name      Usage Example   public static String getDayOfWeek String date     return LocalDate parse date  DateTimeFormatter ofPattern  dd MM yyyy    getDayOfWeek   name       public static void callerMethod       System out println getDayOfWeek  06 02 2018       TUESDAY

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Simply use SimpleDateFormat   SimpleDateFormat sdf   new SimpleDateFormat  dd MM yyyy   java util Locale ENGLISH   Date myDate   sdf parse  28 12 2013    sdf applyPattern  EEE  d MMM yyyy    String sMyDate   sdf format myDate     The result is   Sat  28 Dec 2013  The default constructor is taking  the default  Locale  so be careful using it when you need a specific pattern   public SimpleDateFormat String pattern        this pattern  Locale getDefault Locale Category FORMAT

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method below retrieves seven days and return short name of days in List Array in Kotlin though  you can just reformat then in Java format  just presenting idea how Calendar  can return short name  private fun getDayDisplayName   List lt String gt           val calendar   Calendar getInstance           val dates  mutableListOf lt String gt            dates clear           val s    calendar getDisplayName DAY OF WEEK  SHORT  Locale US          dates add s          for i in 0  5               calendar roll  Calendar DATE  -1              dates add calendar getDisplayName DAY OF WEEK  SHORT  Locale US                     return dates toList           out put results like  I System out  Wed     Tue     Mon     Sun I System out  Sat     Fri     Thu

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public class TryDateFormats       public static void main String   args  throws ParseException           String month    08           String day    05           String year    2015           String inputDateStr   String format   s  s  s   day  month  year           Date inputDate   new SimpleDateFormat  dd MM yyyy   parse inputDateStr           Calendar calendar   Calendar getInstance            calendar setTime inputDate           String dayOfWeek   calendar getDisplayName Calendar DAY OF WEEK  Calendar LONG  Locale US  toUpperCase            System out println dayOfWeek

[java] How to determine day of week by passing specific date?

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