How to convert Japanese date into English date format?

Question

I set Japanese date using Locale (e.g. 21 11月 2016) in my android app. But, I want to send that date into "dd-MM-yyyy" (e.g. 21-11-2016) format to my APIs.

When I try to do this I get below exception :

java.lang.IllegalArgumentException: Bad class: class java.lang.String

Below is my code :

public String convertDate(String date) {
    System.out.println("......ORIGINAL DATE....... " + date); // ......ORIGINAL DATE....... 21 11月 2016
    String myFormat = "dd-MM-yyyy"; //In which you need put here
    SimpleDateFormat sdf = new SimpleDateFormat(myFormat, new Locale(getMyLocale())); //Japanese locale is set but tried english too
    System.out.println("......CONVERTED DATE....... " + sdf.format(date)); //should be 21-11-2016 but getting above error
    return sdf.format(new Date(date));
}

Moreover, for US/English Locale it works fine but for Japanese I am getting this error.

as you are parsing a String then you should use `parse` not `format` Also the format of `21 11月 2016` is not `dd-MMM-yyyy` - try parsing with format of `dd MM月 yyyy` if that is really your string — Scary Wombat, Nov 21 '16 at 06:23
See dd-MM-yyyy is the format in which I need it but on text label I set date like 21 Nov 2016 — VVB, Nov 21 '16 at 06:24
And for parse I get this error java.text.ParseException: Unparseable date: "2016年11月 21日" (at offset 11) — VVB, Nov 21 '16 at 06:26
call `java.util.Locale.getDefault()` instead of `new Locale(getMyLocale())` — IntelliJ Amiya, Nov 21 '16 at 06:29
Doing same. See what getMyLocale() returns "return Locale.getDefault().getLanguage();" — VVB, Nov 21 '16 at 06:30
If you want to convert StringA to StringB then your need two different formatters `Date a = sdf1.parse("2016年11月 21日"); sdf2.format (a);` sdf1 will input mask sdf2 will output mask — Scary Wombat, Nov 21 '16 at 06:31
Do you mean to create 2 DateFormat's, English & Japan resp.? — VVB, Nov 21 '16 at 06:33
Did it but getting java.text.ParseException: Unparseable date: "21 11月 2016" (at offset 0) — VVB, Nov 21 '16 at 06:35
@VVB So you don't know the input dateformat? (other than that its japanese) — K Neeraj Lal, Nov 21 '16 at 06:42
@VVB Edit your Question to show *exact* examples of specific input strings, specific formatting pattern, and specific output results or specific error. Otherwise you are wasting our time. — Basil Bourque, Nov 21 '16 at 06:45

score 4 · Answer 1 · answered Nov 21 '16 at 06:48

You need two formatters as below

    String in = "2016年11月 21日";   // really a space here?
    SimpleDateFormat sdf1 = new SimpleDateFormat ("yyyy年MM月 dd日");
    Date d1 = sdf1.parse(in);

    SimpleDateFormat sdf2 = new SimpleDateFormat ("dd-MM-yyyy");

    System.out.println(sdf2.format(d1));

score 1 · Answer 2 · edited May 23 '17 at 11:53

java.time

You are using the troublesome old legacy date-time classes supplanted by java.time classes.

Define a DateTimeFormatter object to match the pattern of your input strings and specify a Locale for Japan. Parse input string into a LocalDate object. Call LocalDate.parse.

Define a DateTimeFormatter object to match your desired output. Call LocalDate::format to generate a string you desire.

This has been documented many times already in StackOverflow. Please search to find example code and further discussion.

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.

The Joda-Time project, now in maintenance mode, advises migration to java.time.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

Where to obtain the java.time classes?

Java SE 8 and SE 9 and later
- Built-in.
- Part of the standard Java API with a bundled implementation.
- Java 9 adds some minor features and fixes.
Java SE 6 and SE 7
- Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
- The ThreeTenABP project adapts ThreeTen-Backport (mentioned above) for Android specifically.
- See How to use….

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

How to convert Japanese date into English date format?

2 Answers2

java.time

About java.time