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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2016/04/12 22:41:25 UTC
[jira] [Commented] (PDFBOX-2420) DateConverter doesn't handle time
zones outside -12 to +12 range properly
[ https://issues.apache.org/jira/browse/PDFBOX-2420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15237934#comment-15237934 ]
Tilman Hausherr commented on PDFBOX-2420:
-----------------------------------------
possibly related:
https://github.com/veraPDF/veraPDF-library/issues/547
> DateConverter doesn't handle time zones outside -12 to +12 range properly
> -------------------------------------------------------------------------
>
> Key: PDFBOX-2420
> URL: https://issues.apache.org/jira/browse/PDFBOX-2420
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.0
> Reporter: Arjohn Kampman
> Fix For: 2.1.0
>
> Attachments: _PDFBOX_2420__Improved_handling_timezones_between__14_and__14_hours_.patch, _PDFBOX_2420__Improved_handling_timezones_between__14_and__14_hours__Correct_version_.patch
>
>
> DateConverter normalizes time zones in restrainTZoffset(...) to a value that is between -12:00 and +12:00. So a time zone like +13:00 gets normalized to -11:00. However, the date itself is not adapted accordingly. As a result, a time stamp like "2014-7-20T05:0:00+1300" gets changed to "2014-7-20T05:0:00-1100", which is actually 24 hours later! To compensate for the time zone change, 24 hours should have been subtracted from the date: "2014-7-19T05:0:00-1100".
> Personally, I'd prefer to leave the time zones untouched completely. Note that XML Schema defines time zones up to +/- 14:00 to be valid: http://www.w3.org/TR/xmlschema-2/#dateTime-timezones. For any time zones out of that range either generate an error or consider a garbage-in-garbage-out policy.
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