Best way to compare dates in Android

Question

I am trying to compare a date in a String format to the current date  This is how I did it  haven t tested  but should work   but am using deprecated methods  Any good suggestion for an alternative  Thanks   P S  I really hate doing Date stuff in Java  There are so many ways to do the same thing  that you really aren t sure which one is the correct one  hence my question here   String valid until    1 1 1990    Calendar cal   Calendar getInstance    SimpleDateFormat sdf   new SimpleDateFormat  dd mm yyyy    Date strDate   sdf parse valid until    int year   strDate getYear       this is deprecated int month   strDate getMonth      this is deprecated int day   strDate getDay       this is deprecated         Calendar validDate   Calendar getInstance    validDate set year  month  day    Calendar currentDate   Calendar getInstance     if  currentDate after validDate         catalog outdated   1

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SimpleDateFormat sdf new SimpleDateFormat  d MM yyyy    Date date null  Date date1 null  try          date sdf parse startDate          date1 sdf parse endDate          catch  ParseException e                  e printStackTrace          if  date1 after date   amp  amp  date1 equals date         do your work

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You can directly create a Calendar from a Date   Calendar validDate   new GregorianCalendar    validDate setTime strDate   if  Calendar getInstance   after validDate         catalog outdated   1

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Note that the right format is   dd MM yyyy   before the code works   mm  means minuts     String valid until    01 07 2013   SimpleDateFormat sdf   new SimpleDateFormat  dd MM yyyy    Date strDate   null  try       strDate   sdf parse valid until     catch  ParseException e        e printStackTrace      if  new Date   after strDate         catalog outdated   1

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Kotlin supports operators overloading   In Kotlin you can easily compare dates with compare operators  Because Kotlin already support operators overloading   So to compare date objects    firstDate  Date      your first date secondDate  Date      your second date  if firstDate  lt  secondDate      fist date is before second date      and if you re using calendar objects  you can easily compare like this   if cal1 time  lt  cal2 time      cal1 date is before cal2 date

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You can use validDate setTime strDate   Have a look at the javadoc at http   docs oracle com javase 1 5 0 docs api java util Calendar html

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Sometimes we need to do a list with dates  like  today with hour  yesterday with yesterday  other days with 23 06 2017  To make this we need to compare current time with our data   Public class DateUtil        Public static int getDateDayOfMonth  Date date            Calendar calendar   Calendar getInstance             Calendar setTime  date           Return calendar get  Calendar DAY OF MONTH              Public static int getCurrentDayOfMonth              Calendar calendar   Calendar getInstance             Return calendar get  Calendar DAY OF MONTH              Public static String convertMillisSecondsToHourString  long millisSecond            Date date   new Date  millisSecond           Format formatter   new SimpleDateFormat   HH  mm            Return formatter format  date              Public static String convertMillisSecondsToDateString  long millisSecond            Date date   new Date  millisSecond           Format formatter   new SimpleDateFormat   dd   MM   yyyy            Return formatter format  date              Public static long convertToMillisSecond  Date date            Return date getTime                Public static String compare  String stringData  String yesterday             String result                SimpleDateFormat simpleDateFormat   new SimpleDateFormat   yyyy-MM-dd HH  mm  ss            Date date   null           Try               Date   simpleDateFormat parse  stringData             Catch  ParseException e                E printStackTrace                        Long millisSecond   convertToMillisSecond  date           Long currencyMillisSecond   System currentTimeMillis              If  currencyMillisSecond gt  millisSecond                Long diff   currencyMillisSecond - millisSecond              Long day   86400000L               If  diff  lt day  amp  amp  getCurrentDayOfMonth       getDateDayOfMonth  date                     Result   convertMillisSecondsToHourString  millisSecond                  Else if  diff  lt  day   2   amp  amp  getCurrentDayOfMonth    -1    getDateDayOfMonth  date                     Result   yesterday                Else                   Result   convertMillisSecondsToDateString  millisSecond                                    Return result            Also you can check this example in GitHub and this post

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String date    03 26 2012 11 00 00       String dateafter    03 26 2012 11 59 00       SimpleDateFormat dateFormat   new SimpleDateFormat               MM dd yyyy hh mm ss        Date convertedDate   new Date        Date convertedDate2   new Date        try           convertedDate   dateFormat parse date           convertedDate2   dateFormat parse dateafter           if  convertedDate2 after convertedDate                 txtView setText  true              else               txtView setText  false                    catch  ParseException e               TODO Auto-generated catch block         e printStackTrace            it return true   and you can also check before and equal with help of date before and date equal

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Time for the modern answer   java time and ThreeTenABP      DateTimeFormatter dateFormatter   DateTimeFormatter ofPattern  d M u        String validUntil    1 1 1990       LocalDate validDate   LocalDate parse validUntil  dateFormatter       LocalDate currentDate   LocalDate now ZoneId of  Pacific Efate         if  currentDate isAfter validDate             System out println  Catalog is outdated            When I ran this code just now  the output was      Catalog is outdated   Since it is never the same date in all times zones  give explicit time zone to LocalDate now  If you want the catalog to expire at the same time in all time zones  you may give ZoneOffset UTC as long as you inform you users that you are using UTC   I am using java time  the modern Java date and time API  The date-time classes that you used  Calendar  SimpleDateFormat and Date  are all poorly designed and fortunately long outdated  Also despite the name a Date doesn   t represent a date  but a point in time  One consequence of this is  even though today is February 15  2019  a newly created Date object is already after  so not equal to  a Date object from parsing 15 02 2019  This confuses some  Contrary to this the modern LocalDate is a date without time of day  and without time zone   so two LocalDates representing today   s date will always be equal   Question  Can I use java time on Android   Yes  java time works nicely on older and newer Android devices  It just requires at least Java 6    In Java 8 and later and on newer Android devices  from API level 26  the modern API comes built-in  In Java 6 and 7 get the ThreeTen Backport  the backport of the modern classes  ThreeTen for JSR 310  see the links at the bottom   On  older  Android use the Android edition of ThreeTen Backport  It   s called ThreeTenABP  And make sure you import the date and time classes from org threeten bp with subpackages    Links   Oracle tutorial  Date Time explaining how to use java time  Java Specification Request  JSR  310  where java time was first described  ThreeTen Backport project  the backport of java time to Java 6 and 7  ThreeTen for JSR-310   ThreeTenABP  Android edition of ThreeTen Backport Question  How to use ThreeTenABP in Android Project  with a very thorough explanation

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Update  The Joda-Time library is now in maintenance-mode  and recommends migrating to the java time framework that succeeds it  See the Answer by Ole V V       Joda-Time  The java util Date and  Calendar classes are notoriously troublesome  Avoid them  Use either Joda-Time or the new java time package in Java 8   LocalDate  If you want date-only without time-of-day  then use the LocalDate class   Time Zone  Getting the current date depends on the time zone  A new date rolls over in Paris before  Montr  al  Specify the desired time zone rather than depend on the JVM s default   Example in Joda-Time 2 3   DateTimeFormat formatter   DateTimeFormat forPattern   d M yyyy     LocalDate localDate   formatter parseLocalDate   1 1 1990     boolean outdated   LocalDate now  DateTimeZone UTC   isAfter  localDate

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You could try this   Calendar today   Calendar getInstance      today add Calendar DAY OF YEAR  0    today set Calendar HOUR OF DAY  hrs    today set Calendar MINUTE  mins     today set Calendar SECOND  0      and you could use today getTime   to retrieve value and compare

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convert the date to Calendar and make your calculations there     Calendar cal   Calendar getInstance    cal setTime date    int year   cal get Calendar YEAR   int month   cal geT Calendar MONTH   int day   cal get Calendar DAY OF MONTH     same as cal get Calendar DATE   Or  SimpleDateFormat sdf   new SimpleDateFormat  quot dd MM yyyy quot    Date strDate   sdf parse valid until    if  strDate after new Date          catalog outdated   1

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SimpleDateFormat dateFormat   new SimpleDateFormat  yyyy-MM-dd  Locale getDefault     Calendar calendar1   Calendar getInstance    Calendar calendar2   Calendar getInstance     Date date1   dateFormat parse  2013-01-01    Date date2   dateFormat parse  2013-01-02     calendar1 setTime date1   calendar2 setTime date2    System out println  Compare Result       calendar2 compareTo calendar1    System out println  Compare Result       calendar1 compareTo calendar2      Compares the time represented by this Calendar to that represented by the given Calendar   Returns 0 if the times of the two Calendars are equal  -1 if the time of this Calendar is before the other one  1 if the time of this Calendar is after the other one

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Calendar toDayCalendar   Calendar getInstance    Date date1   toDayCalendar getTime      Calendar tomorrowCalendar   Calendar getInstance    tomorrowCalendar add Calendar DAY OF MONTH 1   Date date2   tomorrowCalendar getTime        date1 is a present date and date2 is tomorrow date  if   date1 compareTo date2   lt  0            0 comes when two date are same        1 comes when date1 is higher then date2      -1 comes when date1 is lower then date2

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Your code could be reduced to   SimpleDateFormat sdf   new SimpleDateFormat  dd MM yyyy    Date strDate   sdf parse valid until   if  new Date   after strDate         catalog outdated   1      or  SimpleDateFormat sdf   new SimpleDateFormat  dd MM yyyy    Date strDate   sdf parse valid until   if  System currentTimeMillis    gt  strDate getTime          catalog outdated   1

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You can use compareTo       CompareTo method must return negative number if current object is less   than other object  positive number if current object is greater than   other object and zero if both objects are equal to each other       Get Current Date Time Calendar c   Calendar getInstance    SimpleDateFormat sdf   new SimpleDateFormat  MM dd yyyy HH mm aa    String getCurrentDateTime   sdf format c getTime     String getMyTime  05 19 2016 09 45 PM    Log d  getCurrentDateTime  getCurrentDateTime       getCurrentDateTime  05 23 2016 18 49 PM  if  getCurrentDateTime compareTo getMyTime   lt  0       else    Log d  Return   getMyTime older than getCurrentDateTime

[java] Best way to compare dates in Android

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