How to check if a date is greater than another in Java

Question

I am working on a Java application which generates a report for a duration entered by a user in the command line  The user needs to enter the dates in the following format  dd-MM-yyyy   gt  java report startDate endDate  Example   java report 01-01-2013 31-03-2013  In the code I save the dates in two strings  I have to make sure that the start date entered by the user should be a date earlier than the end-date  Is there an built-in function which can help me achieve this by passing these two strings to it

User · Answer

Parse the string into date  then compare using compareTo  before or after  Date d   new Date    d compareTo anotherDate    i e   Date date1   new SimpleDateFormat  MM dd yyyy   parse date1string  Date date2   new SimpleDateFormat  MM dd yyyy   parse date2string   date1 compareTo date2     Copying the comment provided below by  MuhammadSaqib to complete this answer       Returns the value 0 if the argument Date is equal to this Date  a   value less than 0 if this Date is before the Date argument  and a   value greater than 0 if this Date is after the Date argument  and   NullPointerException - if anotherDate is null    javadoc for compareTo     http   docs oracle com javase 6 docs api java util Date html compareTo java util Date

User · Answer

You can use Date before   or Date after   or Date equals   for date comparison   Taken from here   import java text ParseException  import java text SimpleDateFormat  import java util Date   public class DateDiff        public static void main  String   args                 compareDates  2017-01-13 00 00 00    2017-01-14 00 00 00      output will be Date1 is before Date2         compareDates  2017-01-13 00 00 00    2017-01-12 00 00 00     output will be Date1 is after Date2         compareDates  2017-01-13 00 00 00    2017-01-13 10 20 30     output will be Date1 is before Date2 because date2 is ahead of date 1 by 10 20 30 hours         compareDates  2017-01-13 00 00 00    2017-01-13 00 00 00     output will be Date1 is equal Date2 because both date and time are equal            public static void compareDates String d1 String d2                try                 If you already have date objects then skip 1                1                Create 2 dates starts             SimpleDateFormat sdf   new SimpleDateFormat  yyyy-MM-dd HH mm ss                Date date1   sdf parse d1               Date date2   sdf parse d2                System out println  Date1  sdf format date1                System out println  Date2  sdf format date2   System out println                    Create 2 dates ends               1                 Date object is having 3 methods namely after before and equals for comparing                after   will return true if and only if date1 is after date 2             if date1 after date2                    System out println  Date1 is after Date2                                 before   will return true if and only if date1 is before date2             if date1 before date2                    System out println  Date1 is before Date2                                 equals   returns true if both the dates are equal             if date1 equals date2                    System out println  Date1 is equal Date2                               System out println                      catch ParseException ex               ex printStackTrace                         public static void compareDates Date date1 Date date2                   if you already have date objects then skip 1           1            1            date object is having 3 methods namely after before and equals for comparing           after   will return true if and only if date1 is after date 2         if date1 after date2                System out println  Date1 is after Date2                         before   will return true if and only if date1 is before date2         if date1 before date2                System out println  Date1 is before Date2                         equals   returns true if both the dates are equal         if date1 equals date2                System out println  Date1 is equal Date2                       System out println

User · Answer

You need to use a SimpleDateFormat  dd-MM-yyyy will be the format  to parse the 2 input strings to Date objects and then use the Date before otherDate   or  Date after otherDate  to compare them   Try to implement the code yourself

User · Answer

Parse the two dates firstDate and secondDate using SimpleDateFormat    firstDate after secondDate    firstDate before secondDate

[java] How to check if a date is greater than another in Java?

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