Time comparison

Question

I have a time in hh mm and it has to be entered by the user in that format   However  I want to compare the time  eg  11 22  is it between 10am to 6pm  But how do I compare it

User · Answer

The following assumes that your hours and minutes are stored as ints in variables named hh and mm respectively   if   hh  gt  START HOUR     hh    START HOUR  amp  amp  mm  gt   START MINUTE    amp  amp           hh  lt  END HOUR     hh    END HOUR  amp  amp  mm  lt   END MINUTE

User · Answer

From your statement  it seems like you merely want to write   if  10  gt   hh  amp  amp  hh  lt  18              This is trivial if you are given the hours already  But surely you are asking something else

User · Answer

Java doesn t  yet  have a good built-in Time class  it has one for JDBC queries  but that s not what you want    One option would be use the JodaTime APIs and its LocalTime class   Sticking with just the built-in Java APIs  you are stuck with java util Date  You can use a SimpleDateFormat to parse the time  then the Date comparison functions to see if it is before or after some other time   SimpleDateFormat parser   new SimpleDateFormat  HH mm    Date ten   parser parse  10 00    Date eighteen   parser parse  18 00     try       Date userDate   parser parse someOtherDate       if  userDate after ten   amp  amp  userDate before eighteen                         catch  ParseException e           Invalid date was entered     Or you could just use some string manipulations  perhaps a regular expression to extract just the hour and the minute portions  convert them to numbers and do a numerical comparison   Pattern p   Pattern compile    d 2     d 2      Matcher m   p matcher userString   if  m matches           String hourString   m group 1       String minuteString   m group 2       int hour   Integer parseInt hourString       int minute   Integer parseInt minuteString        if  hour  gt   10  amp  amp  hour  lt   18                          It really all depends on what you are trying to accomplish

User · Answer

Adam explain well in his answer  But I used this way  I think this is easiest way to understand time comparison  in  java   First create 3 calender object with set your time only   Hour and min    then get GMT milliseconds of that time and simply compare   Ex    Calendar chechDateTime   Calendar getInstance    chechDateTime set Calendar MILLISECOND  0   chechDateTime set Calendar SECOND  0   chechDateTime set Calendar HOUR  11   chechDateTime set Calendar MINUTE  22     Calendar startDateTime   Calendar getInstance    startDateTime set Calendar MILLISECOND  0   startDateTime set Calendar SECOND  0   startDateTime set Calendar HOUR  10   startDateTime set Calendar MINUTE  0    Calendar endDateTime   Calendar getInstance    endDateTime set Calendar MILLISECOND  0   endDateTime set Calendar SECOND  0   endDateTime set Calendar HOUR  18   endDateTime set Calendar MINUTE  22     long chechDateTimeMilliseconds chechDateTime getTime   getTime     long startDateTimeMilliseconds startDateTime getTime   getTime     long endDateTimeMilliseconds endDateTime getTime   getTime      System out println  chechDateTime     chechDateTimeMilliseconds   System out println  startDateTime   startDateTimeMilliseconds   System out println  endDateTime   endDateTimeMilliseconds      if chechDateTimeMilliseconds gt  startDateTimeMilliseconds  amp  amp  chechDateTimeMilliseconds  lt   endDateTimeMilliseconds           System out println  In between          else           System out println  Not In between             Output will look like this    chechDateTime   1397238720000 startDateTime 1397233800000 endDateTime 1397263920000 In between

User · Answer

package javaapplication4   import java text    import java util                author Stefan Wendelmann     public class JavaApplication4       private static SimpleDateFormat sdf   new SimpleDateFormat  HH mm ss SSS                 param args the command line arguments         public static void main String   args  throws ParseException         SimpleDateFormat parser   new SimpleDateFormat  dd MM YYYY HH mm ss SSS        Date before   parser parse  01 10 1990 07 00 00 000        Date base   parser parse  01 10 1990 08 00 00 000        Date after   parser parse  01 10 1990 09 00 00 000         printCompare base  base             printCompare base  before             printCompare base  before    lt         printCompare base  after    lt         printCompare base  after    gt         printCompare base  before    gt         printCompare base  before    lt          printCompare base  base    lt          printCompare base  after    lt          printCompare base  after    gt          printCompare base  base    gt          printCompare base  before    gt              private static void printCompare  Date a  Date b  String operator       System out println sdf format b    t  operator   t  sdf format a    t  compareTime a  b  operator           protected static boolean compareTime Date a  Date b  String operator          if  a    null              return false            try               Zeit aus Datum holen    The Magic happens here i only get the Time out of the Date Object       SimpleDateFormat parser   new SimpleDateFormat  HH mm ss SSS          a   parser parse parser format a          b   parser parse parser format b              catch  ParseException ex              System err println ex             switch  operator              case               return b compareTo a     0        case   lt            return b compareTo a   lt  0        case   gt            return b compareTo a   gt  0        case   lt             return b compareTo a   lt   0        case   gt             return b compareTo a   gt   0        default          throw new IllegalArgumentException  Operator     operator     wird f  r Feldart Time nicht unterst  tzt                        run  08 00 00 000        08 00 00 000    true 07 00 00 000        08 00 00 000    false 07 00 00 000     lt    08 00 00 000    true 09 00 00 000     lt    08 00 00 000    false 09 00 00 000     gt    08 00 00 000    true 07 00 00 000     gt    08 00 00 000    false 07 00 00 000     lt    08 00 00 000    true 08 00 00 000     lt    08 00 00 000    true 09 00 00 000     lt    08 00 00 000    false 09 00 00 000     gt    08 00 00 000    true 08 00 00 000     gt    08 00 00 000    true 07 00 00 000     gt    08 00 00 000    false BUILD SUCCESSFUL  total time  0 seconds

User · Answer

You can use the compareTo   method from Java Date class  public int result   date compareTo Date anotherDate      Return Value  The function gives three return values specified below   It returns the value 0 if the argument Date is equal to this Date  It returns a value less than 0 if this Date is before the Date argument  It returns a value greater than 0 if this Date is after the Date argument

User · Answer

import java util Calendar   Calendar cal   Calendar getInstance    int currentHour   cal get Calendar HOUR   if  currentHour  gt  10  amp  amp  currentHour  lt  18          then rock on

User · Answer

example   import java util       import java lang Object     import java text Collator     public class CurrentTime       public class CurrentTime             public static void main  String   args                       Calendar calendar   new GregorianCalendar               String am pm             int hour   calendar get  Calendar HOUR               int minute   calendar get  Calendar MINUTE                  int second   calendar get Calendar SECOND              if  calendar get  Calendar AM PM      0                   am pm    AM                  if hour  gt  10                     System out println   welcome                                         else                 am pm    PM                  if hour lt 6                     System out println   welcome                              String time    Current Time       hour         minute         am pm             System out println  time                       Source

User · Answer

String timeRange    quot 12 24-13 24 quot           String   timeR   timeRange trim   split  quot - quot                        java 8         LocalTime start   LocalTime parse timeR 0  trim             LocalTime end   LocalTime parse timeR 1  trim             LocalTime current   LocalTime now            LocalTime currentHM   LocalTime parse current getHour    quot   quot  current getMinute                               if  currentHM isBefore start   amp  amp   currentHM isAfter end                 return true           else               return false

User · Answer

I am using this class for time in this format  hh mm ss  u can use it with  hh mm 00   zero seconds  for your example  Here is the complete code  It has compare and between function and also checks the time format  in case of invalid time and throws TimeException   Hope you can use it or modify it for your needs   Time class   package es utility time   import java util regex Matcher  import java util regex Pattern              author adrian     public class Time        private int hours    Hours of the day     private int minutes    Minutes of the day     private int seconds    Seconds of the day     private String time    Time of the day                 Constructor of Time class                param time         throws TimeException if time parameter is not valid             public Time String time  throws TimeException             Check if valid time         if   validTime time                 throw new TimeException                        Init class parametars         String   params   time split               this time   time          this hours   Integer parseInt params 0            this minutes   Integer parseInt params 1            this seconds   Integer parseInt params 2                          Constructor of Time class                param hours         param minutes         param seconds         throws TimeException if time parameter is not valid             public Time int hours  int minutes  int seconds  throws TimeException             Check if valid time         if   validTime hours  minutes  seconds                 throw new TimeException                      this time   timeToString hours  minutes  seconds           this hours   hours          this minutes   minutes          this seconds   seconds                         Checks if the sting can be parsed as time                param time  correct from hh mm ss          return true if ok  lt br  gt  false if not ok             private boolean validTime String time            String regex      01   0-9  2 0-3    0-5  0-9   0-5  0-9            Pattern p   Pattern compile regex           Matcher m   p matcher time           return m matches                          Checks if the sting can be parsed as time                param hours hours         param minutes minutes         param seconds seconds         return true if ok  lt br  gt  false if not ok             private boolean validTime int hours  int minutes  int seconds            return hours  gt   0  amp  amp  hours  lt   23  amp  amp  minutes  gt   0  amp  amp  minutes  lt   59  amp  amp  seconds  gt   0  amp  amp  seconds  lt   59                        From Integer values to String time                param hours         param minutes         param seconds         return String generated from int values for hours minutes and seconds             private String timeToString int hours  int minutes  int seconds            StringBuilder timeBuilder   new StringBuilder              if  hours  lt  10                timeBuilder append  0   append hours             else               timeBuilder append hours                     timeBuilder append               if  minutes  lt  10                timeBuilder append  0   append minutes             else               timeBuilder append minutes                     timeBuilder append               if  seconds  lt  10                timeBuilder append  0   append seconds             else               timeBuilder append seconds                     return timeBuilder toString                          Compare this time to other                param compare         return -1 time is before  lt br  gt  0 time is equal  lt br  gt  time is after             public int compareTime Time compare              Check hours         if  this getHours    lt  compare getHours        If hours are before return -1             return -1                    if  this getHours    gt  compare getHours        If hours are after return 1             return 1                      If no return hours are equeal           Check minutes         if  this getMinutes    lt  compare getMinutes        If minutes are before return -1             return -1                    if  this getMinutes    gt  compare getMinutes        If minutes are after return 1             return 1                      If no return minutes are equeal           Check seconds         if  this getSeconds    lt  compare getSeconds        If minutes are before return -1             return -1                    if  this getSeconds    gt  compare getSeconds        If minutes are after return 1             return 1                      If no return seconds are equeal and return 0         return 0             public boolean isBetween Time before  Time after  throws TimeException          if before compareTime after    1               throw new TimeException  Time  before  is after  after  time                        Compare with before and after         if  this compareTime before     -1    this compareTime after     1      If time is before before time return false or time is after after time             return false            else               return true                       public int getHours             return hours             public void setHours int hours            this hours   hours             public int getMinutes             return minutes             public void setMinutes int minutes            this minutes   minutes             public int getSeconds             return seconds             public void setSeconds int seconds            this seconds   seconds             public String getTime             return time             public void setTime String time            this time   time                        Override the toString method and return all of the class private        parameters                return String Time      hours     hours      minutes     minutes             seconds     seconds      time     time                    Override     public String toString             return  Time      hours     hours      minutes     minutes      seconds     seconds      time     time                   TimeException class   package es utility time              author adrian     public class TimeException extends Exception        public TimeException             super  Cannot create time with this params               public TimeException String message            super message

User · Answer

With Java 8   you can use the new Java time API    to parse the time   LocalTime time   LocalTime parse  11 22    to do date comparisons  you have LocalTime  isBefore and LocalTime  isAfter - note that these methods are strict   So you problem would be as simple as   public static void main String   args      LocalTime time   LocalTime parse  11 22      System out println isBetween time  LocalTime of 10  0   LocalTime of 18  0        public static boolean isBetween LocalTime candidate  LocalTime start  LocalTime end      return  candidate isBefore start   amp  amp   candidate isAfter end       Inclusive      For inclusive beginning but exclusive ending  half-open   use this line   return  candidate isBefore start   amp  amp  candidate isBefore end       Exclusive of end

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