DateTimeFormatter fails to parse a date in JDK 17 where as passes in JDK8

October 27, 2022

Here is the code snippet

String date = "Wed, 20 Feb 2019 07:14:06 +0100";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("EEE, d MMM yyyy HH:mm:ss Z");
System.out.println(ZonedDateTime.parse(date, formatter).toString());

This code works fine with JDK8 where as fails in JDK17 with the following exception

Text 'Wed, 20 Feb 2019 07:14:06 +0100' could not be parsed at index 0
java.time.format.DateTimeParseException: Text 'Wed, 20 Feb 2019 07:14:06 +0100' could not be parsed at index 0
    at java.base/java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:2052)
    at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1954)
    at java.base/java.time.ZonedDateTime.parse(ZonedDateTime.java:600)

>Solution :

Your problem has nothing to do with Java 8 versus Java 17.

Tip: Before blaming software that is formally specified, is thoroughly tested by enormous test suites, and is used by millions of programmers daily, suspect your own code first.

`Locale`

Specify a Locale. The locale determines the human language and cultural norms used in translating month name, etc.

Locale locale = Locale.US ;
DateTimeFormatter formatter = 
    DateTimeFormatter
    .ofPattern( "EEE, d MMM yyyy HH:mm:ss Z" )
    .withLocale( locale );
    
String input = "Wed, 20 Feb 2019 07:14:06 +0100" ;
ZonedDateTime zdt = ZonedDateTime.parse( input , formatter ) ;
String output = zdt.toString() ;
System.out.println( output );

See this code run at Ideone.com.