mothers_day.js revision 1412:bfe6bd5d57bf 
1# compute Mothers day of the given the year
2
3/*
4 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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9 *
10 *   - Redistributions of source code must retain the above copyright
11 *     notice, this list of conditions and the following disclaimer.
12 *
13 *   - Redistributions in binary form must reproduce the above copyright
14 *     notice, this list of conditions and the following disclaimer in the
15 *     documentation and/or other materials provided with the distribution.
16 *
17 *   - Neither the name of Oracle nor the names of its
18 *     contributors may be used to endorse or promote products derived
19 *     from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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24 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34// print "Mother's day" of the given year using Java Time API
35
36if (arguments.length == 0) {
37    print("Usage: jjs mothers_day.js -- year");
38    exit(1);
39}
40
41// java classes used
42var DayOfWeek = java.time.DayOfWeek;
43var LocalDate = java.time.LocalDate;
44var TemporalAdjusters = java.time.temporal.TemporalAdjusters;
45
46var year = parseInt(arguments[0]);
47
48// See: https://en.wikipedia.org/?title=Mother%27s_Day
49// We need second Sunday of May. Make April 30 of the given
50// year adjust and adjust to next Sunday from there twice. To adjust a Date
51// we use a common TemporalAdjuster provided in JDK8.
52// https://docs.oracle.com/javase/8/docs/api/java/time/temporal/TemporalAdjusters.html
53
54print(LocalDate.of(year, 4, 30).
55    with(TemporalAdjusters.next(DayOfWeek.SUNDAY)).
56    with(TemporalAdjusters.next(DayOfWeek.SUNDAY)));
57