sundar@1524: # compute Mothers day of the given the year
sundar@1524: 
sundar@1524: /*
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sundar@1524: 
sundar@1524: // print "Mother's day" of the given year using Java Time API
sundar@1524: 
sundar@1524: if (arguments.length == 0) {
sundar@1524:     print("Usage: jjs mothers_day.js -- year");
sundar@1524:     exit(1);
sundar@1524: }
sundar@1524: 
sundar@1524: // java classes used
sundar@1524: var DayOfWeek = java.time.DayOfWeek;
sundar@1524: var LocalDate = java.time.LocalDate;
sundar@1524: var TemporalAdjusters = java.time.temporal.TemporalAdjusters;
sundar@1524: 
sundar@1524: var year = parseInt(arguments[0]);
sundar@1524: 
sundar@1524: // See: https://en.wikipedia.org/?title=Mother%27s_Day
sundar@1524: // We need second Sunday of May. Make April 30 of the given
sundar@1524: // year adjust and adjust to next Sunday from there twice. To adjust a Date
sundar@1524: // we use a common TemporalAdjuster provided in JDK8.
sundar@1524: // https://docs.oracle.com/javase/8/docs/api/java/time/temporal/TemporalAdjusters.html
sundar@1524: 
sundar@1524: print(LocalDate.of(year, 4, 30).
sundar@1524:     with(TemporalAdjusters.next(DayOfWeek.SUNDAY)).
sundar@1524:     with(TemporalAdjusters.next(DayOfWeek.SUNDAY)));