How do i set Calender Bi-Weekly

Question

I have my small code and I want to get the bi-weekly but can't seem to get it right. How do I Display bi-Weekly in the Calender class. On my Bi Weekly I just put in random code.

   case "Bi-Weekly": {
                beginCalendar.add(Calendar.DAY_OF_MONTH, Calendar.WEDNESDAY);
                break;
            }
case "Month": {
                beginCalendar.add(Calendar.MONTH, 1);
                break;
            }


            case "Quarterly": {
                beginCalendar.add(Calendar.MONTH, 3);
                break;
            }
            case "Half Yearly": {
                beginCalendar.add(Calendar.MONTH, 6);
                break;
            }
            case "Year": {
                beginCalendar.add(Calendar.MONTH, 12);
                break;

Consider not using the `Calendar` class. It is poorly designed and long outdated. Instead you may add [ThreeTenABP](https://github.com/JakeWharton/ThreeTenABP) to your Android project so you can use [java.time, the modern Java date and time API](https://docs.oracle.com/javase/tutorial/datetime/). — Ole V.V., Mar 28 '19 at 03:45

score 0 · Accepted Answer · answered Mar 28 '19 at 00:18

0

I think

.add(Calendar.WEEK_OF_YEAR,2);

is the right one even though I would do some testing on how it behaves around the year-change

answered Mar 28 '19 at 00:18

jonathan Heindl

844
7
16

The answer is correct (and if I said not to use the `Calendar` class, I would just be repeating myself). – Ole V.V. Mar 28 '19 at 07:50

score 0 · Answer 2 · answered Mar 28 '19 at 16:50

java.time

    LocalDate date = LocalDate.of(2019, Month.DECEMBER, 25);

    switch (recurrence) {
        case "Bi-Weekly": {
            date = date.plusWeeks(2);
            break;
        }
        case "Month": {
            date = date.plusMonths(1);
            break;
        }
        case "Quarterly": {
            date = date.plusMonths(3);
            break;
        }
        case "Half Yearly": {
            date = date.plusMonths(6);
            break;
        }
        case "Year": {
            date = date.plusYears(1);
            break;
        }

        default:
            System.err.println("Unrecognized recurrence: " + recurrence);
            break;
    }

    System.out.println("Added for " + recurrence + " gave: " + date);

Trying the code out with the difference strings (in a different order) gave:

Added for Bi-Weekly gave: 2020-01-08
Added for Year gave: 2020-12-25
Added for Quarterly gave: 2020-03-25
Added for Half Yearly gave: 2020-06-25
Added for Month gave: 2020-01-25

Have your calendar events got time of day too? No problem: the code works the same if using a ZonedDateTime or a LocalDateTime instead of a LocalDate.

The Calendar class that you used is poorly designed and long outdated. I find java.time, the modern Java date and time API, so much nicer to work with. Which is why I wanted to show you this option.

Question: Can I use java.time on Android?

Yes, java.time works nicely on older and newer Android devices. It just requires at least Java 6.

In Java 8 and later and on newer Android devices (from API level 26) the modern API comes built-in.
In Java 6 and 7 get the ThreeTen Backport, the backport of the modern classes (ThreeTen for JSR 310; see the links at the bottom).
On (older) Android use the Android edition of ThreeTen Backport. It’s called ThreeTenABP. And make sure you import the date and time classes from org.threeten.bp with subpackages.

Links

Oracle tutorial: Date Time explaining how to use java.time.
Java Specification Request (JSR) 310, where java.time was first described.
ThreeTen Backport project, the backport of java.time to Java 6 and 7 (ThreeTen for JSR-310).
ThreeTenABP, Android edition of ThreeTen Backport
Question: How to use ThreeTenABP in Android Project, with a very thorough explanation.

How do i set Calender Bi-Weekly

2 Answers2

java.time

Question: Can I use java.time on Android?

Links