[jira] [Commented] (LANG-1166) FastDateFormat does not honour 'ZZ' pattern

["Charles Honton (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LANG-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14712373#comment-14712373 ] 

Charles Honton commented on LANG-1166:
--------------------------------------

FastDatePrinter javadoc explicitly states:
{code} 
Java 1.4 introduced a new pattern letter, {@code 'Z'}, to represent
time zones in RFC822 format (eg. {@code +0800} or {@code -1100}).
This pattern letter can be used here (on all JDK versions).

In addition, the pattern {@code 'ZZ'} has been made to represent
ISO 8601 full format time zones (eg. {@code +08:00} or {@code -11:00}).
This introduces a minor incompatibility with Java 1.4, but at a gain of
useful functionality.
 
 Starting with JDK7, ISO 8601 support was added using the pattern {@code 'X'}.
 To maintain compatibility, {@code 'ZZ'} will continue to be supported, but using
 one of the {@code 'X'} formats is recommended.
 {code}

The SimpleDateFormat javadoc states:
{code}
RFC 822 time zone: For formatting, the RFC 822 4-digit time zone format is used:
     RFC822TimeZone:
             Sign TwoDigitHours Minutes
     TwoDigitHours:
             Digit Digit
{code}
SimpleDateFormat will output +0000 whether 'Z', 'ZZ', 'ZZZ', or 'ZZZZ' or however many 'Z' are used. 
FastDateFormat will output +0000 for 'Z' and Z (ISO8601) for 'ZZ'

It's not just UTC that has the formatting difference.  In Paris, FastDateFormat will output +02:00 instead of +0200; and in Los Angeles, -07:00 instead of -0700.

So, for compatible with SimpleDateFormat use 'Z'. 

> FastDateFormat does not honour 'ZZ' pattern
> -------------------------------------------
>
>                 Key: LANG-1166
>                 URL: https://issues.apache.org/jira/browse/LANG-1166
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.time.*
>    Affects Versions: 3.4
>            Reporter: Abhishek Gupta
>             Fix For: 3.5
>
>
> A date format of "yyyy-MM-dd'T'HH:mm:ss.SSS ZZ" returns "2015-08-13T11:37:13.203  Z" for UTC timezone in version 3.4.
> Same format with version 3.3.2 returns "2015-08-13T11:39:28.452 +00:00"
> The code which i am using to test this is as follows:
> {code:java}
> import org.apache.commons.lang3.time.FastDateFormat;
> import java.util.Date;
> import java.util.TimeZone;
> public class FastDateFormatTest {
>     private static final String         DATE_FORMAT    = "yyyy-MM-dd'T'HH:mm:ss.SSS ZZ";
>     private static       FastDateFormat fastDateFormat = FastDateFormat.getInstance(DATE_FORMAT, TimeZone.getTimeZone("UTC"));
>     public static void main(String[] args) {
>         System.out.println("fastDateFormat = " + fastDateFormat.format(new Date()));
>     }
> }
> {code}



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