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https://issues.apache.org/jira/browse/LANG-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17823023#comment-17823023
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Gary D. Gregory commented on LANG-1730:
---------------------------------------
We test on Java LTS versions 8, 11, 17, and 21.
See
[https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml]
This could be specific to Android or whatever time zone info is baked into a
Java Android version.
> DateUtils.parseDateWithLeniency() doesn't accept "GMT" as "zzz" timezone on
> Android
> -----------------------------------------------------------------------------------
>
> Key: LANG-1730
> URL: https://issues.apache.org/jira/browse/LANG-1730
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.time.*
> Affects Versions: 3.14.0
> Environment: Not working: Android 14 (API 34) phone and emulator,
> Android 12 (API 31) emulator
> Working: Arch Linux OpenJDK 11
> Reporter: Hai Zhang
> Priority: Major
>
> Commons Lang3 3.14.0 DateUtils, i.e. FastDateParser under the hood, doesn't
> accept "GMT" as a valid timezone for "zzz" on Android 14, but does accept it
> on desktop OpenJDK 11.
> For example, the string "Mon, 01 May 2023 08:52:19 GMT" can't be parsed with
> pattern "EEE, dd MMM yyyy HH:mm:ss zzz" on Android.
> The same issue was reported at https://github.com/bitfireAT/dav4jvm/issues/22
> , but I found that it's also not working on Android 12 emulator, so I believe
> the actual cause is Commons Lang3 using FastDateParser v.s. previously using
> SimpleDateFormat, instead of upgraded Android platform version.
> I debugged this a little bit and found that the generated regex in
> FastDateParser.TimeZoneStrategy doesn't contain "|gmt|" on Android 14, but
> does contain "|gmt|" on desktop. I suspect maybe Android has some different
> timezone info. I also saw the intentional skip for `TimeZones.GMT_ID` in
> FastDateParser code, which makes me wonder how it got the "|gmt|" on desktop.
> Here are the different generated regexes I saw, with unrelated timezones
> replaced with "...":
> ```
> ((?iu)[+-]\d{4}|GMT[+-]\d{1,2}:\d{2}|yukon time|...|gulf standard
> time|greenwich mean
> time|gmt-12:00|gmt-11:00|gmt-10:00|gmt-09:30|gmt-09:00|gmt-08:00|gmt-07:00|gmt-06:00|gmt-05:00|gmt-04:00|gmt-03:30|gmt-03:00|gmt-02:30|gmt-02:00|gmt-01:00|gmt\+14:00|gmt\+13:45|gmt\+13:00|gmt\+12:45|gmt\+12:00|gmt\+11:00|gmt\+10:30|gmt\+10:00|gmt\+09:30|gmt\+09:00|gmt\+08:45|gmt\+08:00|gmt\+07:00|gmt\+06:30|gmt\+06:00|gmt\+05:45|gmt\+05:30|gmt\+05:00|gmt\+04:30|gmt\+04:00|gmt\+03:30|gmt\+03:00|gmt\+02:00|gmt\+01:00|gmt\+00:00|gilbert
> islands time|...|acre standard time)
> ```
> ```
> ((?iu)[+-]\d{4}|GMT[+-]\d{1,2}:\d{2}|yekt|...|gulf daylight
> time|gt|gst|greenwich mean
> time|gmt-12:00|gmt-11:00|gmt-10:00|gmt-09:00|gmt-08:00|gmt-07:00|gmt-06:00|gmt-05:00|gmt-04:00|gmt-03:00|gmt-02:00|gmt-01:00|gmt\+14:00|gmt\+13:00|gmt\+12:00|gmt\+11:00|gmt\+10:00|gmt\+09:00|gmt\+08:00|gmt\+07:00|gmt\+06:00|gmt\+05:00|gmt\+04:00|gmt\+03:00|gmt\+02:00|gmt\+01:00|gmt|gilt|....|acre
> standard time|acdt)
> ```
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