Java Date Time - Period Example

Example

The following code shows how to calculate the span of time from today until your birthday.
/* //from   w  ww .  j a va 2s.  co m
 * Calculate the span of time from today until your birthday, assuming your
 * birthday occured on January 1st. The calculation is done using both
 * months and days (using Period) and days only (using ChronoUnit.between).
 */
import java.time.LocalDate;
import java.time.Month;
import java.time.Period;
import java.time.temporal.ChronoUnit;

public class Main {

    public static void main(String[] args) {

        LocalDate today = LocalDate.now();
        LocalDate birthday = LocalDate.of(1960, Month.JANUARY, 1);

        LocalDate nextBDay = birthday.withYear(today.getYear());

        //If your birthday has occurred this year already, add 1 to the year.
        if (nextBDay.isBefore(today) || nextBDay.isEqual(today)) {
            nextBDay = nextBDay.plusYears(1);
        }

        Period p = Period.between(today, nextBDay);
        long p2 = ChronoUnit.DAYS.between(today, nextBDay);
        System.out.println("There are " + p.getMonths() + " months, and " +
                           p.getDays() + " days until your next birthday. (" +
                           p2 + " total)");
    }
}
/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
The code above generates the following result.
Field

Period ZERO
Java Date Time - Period Example

Example

Field

Method
