1 # compute Mothers day of the given the year
   2 
   3 /*
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  33 
  34 // print "Mother's day" of the given year using Java Time API
  35 
  36 if (arguments.length == 0) {
  37     print("Usage: jjs mothers_day.js -- year");
  38     exit(1);
  39 }
  40 
  41 // java classes used
  42 var DayOfWeek = java.time.DayOfWeek;
  43 var LocalDate = java.time.LocalDate;
  44 var TemporalAdjusters = java.time.temporal.TemporalAdjusters;
  45 
  46 var 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 
  54 print(LocalDate.of(year, 4, 30).
  55     with(TemporalAdjusters.next(DayOfWeek.SUNDAY)).
  56     with(TemporalAdjusters.next(DayOfWeek.SUNDAY)));