Fetch the Month from yyy-MM-dd String

Question

I have a date string "2012-01-26" which I get from JSON.

I have to now check if the month and year is as current year than display data it in ListView.

SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-DD");
  try {
      Calendar c = Calendar.getInstance(); 
      c.setTime(dateFormat.parse(event_start_date));
      int month = c.get(Calendar.MONTH);
      System.out.println(c.get(Calendar.YEAR));
      System.out.println("month is"+month);
 }

Year value is always correct, but the Month is always zero.What am I missing guys?

Note: I don't want the current year or date, but I want the date and year from the String for e.g"2012-12-28". Right now from the above code I get Year=2012; Month=0; Date=not checked yet. — Asmi, Jan 08 '13 at 09:39
Update: The terrible date-time classes you are using have been supplanted by the *java.time* classes defined in JSR 310. — Basil Bourque, Jun 21 '21 at 08:30

MysticMagicϡ · Accepted Answer · 2013-01-08T09:32:23.990

2

You are fetching month using Calendar's instance.

int month = c.get(Calendar.MONTH);

So you will get current month (i.e. January) And it means 0. So the result is correct.

Check this.

month - The month that was set (0-11) for compatibility with Calendar.

If you want the month of event_start_date, then you won't have to use calendar's instance at all.

You can fetch it using

int month = event_start_date.getMonth();

edited Jan 08 '13 at 09:32

answered Jan 08 '13 at 09:24

MysticMagicϡ

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Yes, I think you are right is there any way I can get "2012-01-26" month and year from the this String – Asmi Jan 08 '13 at 09:29
@Asmi, why do you parse event_start_date? You can use event_start_date.getMonth(). – MysticMagicϡ Jan 08 '13 at 09:31
But the event_start_date is String , how can I get .getMonth() from it? I m getting this String form JSON, not as a Date but as a String – Asmi Jan 08 '13 at 09:32
@Asmi, ok. If the event_start_date string is in YYYY-MM-DD format, you can add these lines: String[] event_start_d = event_start_date.split("-"); int month = Integer.parseInt(event_start_d[1]); – MysticMagicϡ Jan 08 '13 at 09:43
it works:) Splitting it seems very good option.:) Thanks alot – Asmi Jan 08 '13 at 09:47
@Asmi, But I just tried your code. It seems that it will work perfectly if you replace "yyyy-MM-DD" with "yyyy-MM-dd" – MysticMagicϡ Jan 08 '13 at 09:48

Basil Bourque · Answer 2 · 2021-06-21T10:06:16.837

`java.time.YearMonth`

The modern solution uses java.time classes defined in JSR 310.

If you are focused on the year and month without the day, use YearMonth class.

LocalDate ld = LocalDate.parse( "2012-01-26" ) ;
YearMonth ym = YearMonth.from( ld ) ;
int y = ym.getYear() ;
Month m = ym.getMonth() ;
String monthName = m.getDisplayName( TextStyle.FULL , Locale.CANADA_FRENCH ) ;

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.

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

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

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes. Hibernate 5 & JPA 2.2 support java.time.

Where to obtain the java.time classes?

Java SE 8, Java SE 9, Java SE 10, Java SE 11, and later - Part of the standard Java API with a bundled implementation.
- Java 9 brought some minor features and fixes.
Java SE 6 and Java SE 7
- Most of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
- Later versions of Android (26+) bundle implementations of the java.time classes.
- For earlier Android (<26), a process known as API desugaring brings a subset of the java.time functionality not originally built into Android.
  - If the desugaring does not offer what you need, the ThreeTenABP project adapts ThreeTen-Backport (mentioned above) to Android. See How to use ThreeTenABP….

Thanks for posting the modern answer. Please also add the links for backporting `java.time` API and also for using `java.time` API in Android via desugaring. — Arvind Kumar Avinash, Jun 21 '21 at 09:14

score 1 · Answer 3 · answered Jan 08 '13 at 09:23

1

monthes start from 0 - which means youre getting JANUARY. from Calendar.java:

public final static int JANUARY = 0;

answered Jan 08 '13 at 09:23

radai

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score 1 · Answer 4 · answered Jan 08 '13 at 09:24

1

The month is zero based (January = 0) so you have to add one.

answered Jan 08 '13 at 09:24

Henry

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score 1 · Answer 5 · answered Jan 08 '13 at 09:28

1

read the java doc ;)

for MONTH it says:

Field number for get and set indicating the month. This is a calendar-specific value. The first month of the year is JANUARY which is 0; the last depends on the number of months in a year.

answered Jan 08 '13 at 09:28

duffy356

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score 0 · Answer 6 · answered Jan 08 '13 at 09:25

0

That's because month in Calendar start from 0 (for January) and go on till 11 (for December)

answered Jan 08 '13 at 09:25

Ranjan

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Fetch the Month from yyy-MM-dd String

6 Answers6

java.time.YearMonth

About java.time

`java.time.YearMonth`