https://bugzilla.wikimedia.org/show_bug.cgi?id=32758
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Bug #: 32758
Summary: SMW handles timezones incorrectly.
Product: MediaWiki extensions
Version: any
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Semantic MediaWiki
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
SMW handles timezones incorrectly.
It does not recognize official timezone names, like `America/New_York'. It
recognizes only abbreviations, like `EST'.
But the major problem is the list of monikers hardcoded into `SMW_DV_Time.php':
> /// General purpose time zone monikers and their associated offsets in hours
> and fractions of hours
> protected static $m_tz = array( 'A' => 1, 'ACDT' => 10.5, 'ACST' => 9.5,
> 'ADT' => -3, 'AEDT' => 11,
> ...
The problem is that an offset of a particular moniker is *not* fixed but
depends on time. Sometimes government in a country may enable or disable
daylight saving time, or change offset. And do it many times.
There is tzdata database, which contain all known info about timezones. SMW
must use it to handle timestamps properly.
It seems easiest way to use tzdata is using PHP DateTime and DateTimeZone
classes for handling times.
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