Calculate days between two Dates in Java 8

Question

I know there are lots of questions on SO about how to get Dates in Java  but I want an example using new Java 8 Date API  I also know about the JodaTime library  but I want a method without relying on external libraries  The function needs to be compliant with these restrictions   Prevent errors from date savetime Inputs are two Date objects  without time  I know about LocalDateTime  but I need to do this with Date instances

User · Answer

Get number of days before Christmas from current day   try this  System out println ChronoUnit DAYS between LocalDate now   LocalDate of Year now   getValue    Month DECEMBER  25

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If you want logical calendar days  use DAYS between   method from java time temporal ChronoUnit   LocalDate dateBefore  LocalDate dateAfter  long daysBetween   DAYS between dateBefore  dateAfter     If you want literal 24 hour days   a duration   you can use the Duration class instead   LocalDate today   LocalDate now   LocalDate yesterday   today minusDays 1      Duration oneDay   Duration between today  yesterday      throws an exception Duration between today atStartOfDay    yesterday atStartOfDay    toDays      another option   For more information  refer to this document

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You can use until     LocalDate independenceDay   LocalDate of 2014  Month JULY  4   LocalDate christmas   LocalDate of 2014  Month DECEMBER  25    System out println  Until christmas      independenceDay until christmas    System out println  Until christmas  with crono       independenceDay until christmas  ChronoUnit DAYS

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Based on VGR s comments here is what you can use   ChronoUnit DAYS between firstDate  secondDate

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Everyone is saying to use ChronoUnit DAYS between but that just delegates to another method you could call yourself  So you could also do firstDate until secondDate  ChronoUnit DAYS    The docs for both actually mention both approaches and say to use whichever one is more readable

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You can use DAYS between from java time temporal ChronoUnit  e g   import java time temporal ChronoUnit   public long getDaysCountBetweenDates LocalDate dateBefore  LocalDate dateAfter        return DAYS between dateBefore  dateAfter

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If the goal is just to get the difference in days and since the above answers mention about delegate methods would like to point out that once can also simply use -  public long daysInBetween java time LocalDate startDate  java time LocalDate endDate         Check for null values here    return endDate toEpochDay   - startDate toEpochDay

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I know this question is for Java 8  but with Java 9 you could use   public static List lt LocalDate gt  getDatesBetween LocalDate startDate  LocalDate endDate        return startDate datesUntil endDate         collect Collectors toList

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get days between two dates date is instance of java util Date   public static long daysBetweenTwoDates Date dateFrom  Date dateTo                return DAYS between Instant ofEpochMilli dateFrom getTime     Instant ofEpochMilli dateTo getTime

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Use the DAYS in enum java time temporal ChronoUnit   Below is the Sample Code    Output    Number of days between the start date   2015-03-01 and end date   2016-03-03 is      368    Number of days between the start date   2016-03-03 and end date   2015-03-01 is      -368   package com bitiknow date   import java time LocalDate  import java time temporal ChronoUnit               author pradeep        public class LocalDateTimeTry       public static void main String   args                Date in String format          String dateString    2015-03-01               Converting date to Java8 Local date         LocalDate startDate   LocalDate parse dateString           LocalDate endtDate   LocalDate now               Range   End date - Start date         Long range   ChronoUnit DAYS between startDate  endtDate           System out println  Number of days between the start date       dateString     and end date       endtDate                     is     gt      range            range   ChronoUnit DAYS between endtDate  startDate           System out println  Number of days between the start date       endtDate     and end date       dateString                     is     gt      range

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Use the class or method that best meets your needs     the Duration class   Period class   or the ChronoUnit between method     A Duration measures an amount of time using time-based values  seconds  nanoseconds     A Period uses date-based values  years  months  days    The ChronoUnit between method is useful when you want to measure an amount of time in a single unit of time only  such as days or seconds   https   docs oracle com javase tutorial datetime iso period html

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If startDate and endDate are instance of java util Date   We can use the between    method from ChronoUnit  enum   public long between Temporal temporal1Inclusive  Temporal temporal2Exclusive                 ChronoUnit DAYS count days which completed 24 hours   import java time temporal ChronoUnit   ChronoUnit DAYS between startDate toInstant    endDate toInstant        OR   ChronoUnit DAYS between Instant ofEpochMilli startDate getTime     Instant ofEpochMilli endDate getTime

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Here you go   public class DemoDate       public static void main String   args            LocalDate today   LocalDate now            System out println  Current date      today              add 1 month to the current date         LocalDate date2   today plus 1  ChronoUnit MONTHS           System out println  Next month      date2               Put latest date 1st and old date 2nd in  between  method to get -ve date difference         long daysNegative   ChronoUnit DAYS between date2  today           System out println  Days     daysNegative               Put old date 1st and new date 2nd in  between  method to get  ve date difference         long datePositive   ChronoUnit DAYS between today  date2           System out println  Days     datePositive

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import java time LocalDate  import java time temporal ChronoUnit   LocalDate dateBefore    LocalDate of 2020  05  20   LocalDate dateAfter   LocalDate now         long daysBetween    ChronoUnit DAYS between dateBefore  dateAfter   long monthsBetween  ChronoUnit MONTHS between dateBefore  dateAfter   long yearsBetween  ChronoUnit YEARS between dateBefore  dateAfter        System out println daysBetween

[java] Calculate days between two Dates in Java 8

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