Find next quarter end date given previous quarter end date using Java

Question

I am having quarter end date of last quarter let it be 30-09-20 , the requirement is to find end date of next quarter i.e 31-12-20. I am using below code to do the same but is it giving wrong output in some scenarios. This solution should be correct for all quarters.

String str = "30-09-20";
SimpleDateFormat format = new SimpleDateFormat("dd-MM-yy");
Date date = format.parse(str);
Date newDate = DateUtils.addMonths(date, 3);
System.out.println(newDate);//Dec 30 - It should be 31 Dec

Answer 1

To answer your question, I think you are looking for this :

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yy");
LocalDate end = LocalDate.parse("30-09-20", formatter)
    .plusMonths(3)                             // add three months to your date
    .with(TemporalAdjusters.lastDayOfMonth()); // with the last day of the month

Note: don't use the legacy Date library, you tagged your question Java-8 which mean you can use java-time API.

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Get last day of current quarter

@deHaar have reason, to get the end date of curent quarter, I would suggest to use :

public LocalDate lastDayFromDateQuarter(String date) {
    final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yy");
    LocalDate ld = LocalDate.parse(date, formatter);
    int quarter = ld.get(IsoFields.QUARTER_OF_YEAR); // Get the Quarter, 1, 2, 3, 4
    // Then create a new date with new quarter * 3 and last day of month
    return ld.withMonth(quarter * 3).with(TemporalAdjusters.lastDayOfMonth());
}

Get last day of next quarter

To get the last day of the next quarter, then you just can add three months to your date like so :

public static LocalDate lastDayFromDateQuarter(String date) {
    final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yy");
    LocalDate ld = LocalDate.parse(date, formatter);
    int quarter = ld.get(IsoFields.QUARTER_OF_YEAR);
    return ld.withMonth(quarter * 3)
            .plusMonths(3)
            .with(TemporalAdjusters.lastDayOfMonth());
}

Answer 2

tl;dr

Use YearQuarter class from ThreeTen-Extra.

YearQuarter                                       // A class available in the ThreeTen-Extra library.
.from(                                            // Factory method rather than calling `new`. 
    LocalDate.of( 2020 , Month.SEPTEMBER , 30 )   // Returns a `LocalDate` object, represent a date-only value without a time-of-day and without a time zone.
)                                                 // Returns a `YearQuarter` object.
.plusQuarters( 1 )                                // Perform date-math, resulting in a new `YearQuarter` object (per immutable objects pattern). 
.atEndOfQuarter()                                 // Determine the date of last day of this year-quarter.
.toString()                                       // Generate text in standard ISO 8601 format.

2020-12-31

org.threeten.extra.YearQuarter

The ThreeTen-Extra library provides classes that extend the functionality of the java.time classes built into Java 8 and later. One of its classes is YearQuarter to represent a specific quarter in a specific year. The quarters are defined by calendar-year: Jan-Mar, Apr-June, July-Sept, Oct-Dec.

LocalDate localDate = LocalDate.of( 2020 , Month.SEPTEMBER , 30 ) ;
YearQuarter yearQuarter = YearQuarter.from( localDate ) ;

Move to the next quarter by adding one quarter to our current year-quarter.

The java.time and ThreeTen-Extra classes use immutable objects. So rather than alter ("mutate") the original object, when adding we produce a new object.

YearQuarter followingYearQuarter = yearQuarter.plusQuarters( 1 ) ;

Determine the last day of that quarter.

LocalDate lastDateOfFollowingYearQuarter = followingYearQuarter.atEndOfQuarter() ;

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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, & SimpleDateFormat.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.

Where to obtain the java.time classes?

• Java SE 8, Java SE 9, Java SE 10, Java SE 11, and later - 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
  • Most of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
• Android
  • Later versions of Android bundle implementations of the java.time classes.
  • For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). 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.