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I used the Calendar.getInstance().get(Calendar.DATE) to get current date.
So the output is today (2018/05/14). I change the device time to 2018/06/17. So I use the Calendar get the date. I got the 17.
My question is I want to get 05/15 05/16 .... 06/01 ... 0616 these two days. I need to know all the difference days.
So I don't know which function can do this.

ManLok Wong
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    https://developer.android.com/reference/java/time/LocalDateTime – Krzysztof Kubicki May 14 '18 at 10:10
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    The `Calendar` class is long outdated. For your requirements the `LocalDate` class of `java.time` will serve you much better. And `java.time`, the modern Java date and time API, is also generally much nicer to work with (speaking from experience). – Ole V.V. May 14 '18 at 10:32
  • My project api level is too low. So I cannot use `LocalDate`. I don't want to update my api level – ManLok Wong May 15 '18 at 01:18
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    @ManLokWong For earlier Android, see the *ThreeTen-Backport* and *ThreeTenABP* projects. This has been addressed hundreds of time on Stack Overflow. Search Stack Overflow before posting. – Basil Bourque May 15 '18 at 06:41
  • Certainly you can use `java.time` on low API level Android. As Basil Bourque said, add [ThreeTenABP](https://github.com/JakeWharton/ThreeTenABP) to your project. See more in [this question: How to use ThreeTenABP in Android Project](https://stackoverflow.com/questions/38922754/how-to-use-threetenabp-in-android-project). I am told the dependencies are: `compile group: 'org.threeten', name: 'threetenbp', version: '1.3.3', classifier: 'no-tzdb'`. – Ole V.V. May 15 '18 at 10:03

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private static long daysBetween(Date one, Date two) {
        long difference =  (one.getTime()-two.getTime())/86400000;
        return Math.abs(difference);
    }
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    Which question are you answering? Asking because I can’t see this as an answer to the question as asked. – Ole V.V. May 14 '18 at 11:50