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https://issues.apache.org/jira/browse/TRINIDAD-1512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720772#action_12720772
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Yee-Wah Lee commented on TRINIDAD-1512:
---------------------------------------
This is related to the code in
trinidadinternal.convert.DateTimeConverter#getFormattingTimeZone(). In that
method, it copies the converter's timezone and gives the clone a custom ID:
// set the id as "GMT Sign Hours : Minutes"
StringBuilder zoneId = new StringBuilder(9);
int rawOffset = zone.getRawOffset();
..
int minutes = (rawOffset % _MILLIS_PER_HOUR) / _MILLIS_PER_MINUTE;
if (minutes < 10)
{
zoneId.append('0');
}
zoneId.append(minutes);
zone.setID(zoneId.toString());
This sets the ID as "GMT+rawOffset" (raw offset is independent of dst) for the
timezone "America/New_York", which is -5h.
Subsequently, when formatting the string, the underlying DateFormat calls
TimeZone.getDisplayName() which checks if a custom ID is specified and returns
that string.
String id = getID();
String[] names = getDisplayNames(id, locale);
if (names == null) {
if (id.startsWith("GMT")) {
char sign = id.charAt(3);
if (sign == '+' || sign == '-') {
return id;
}
}
> ConvertDateTime uses static GMT+x string for timezone display, doesn't update
> for daylight savings
> --------------------------------------------------------------------------------------------------
>
> Key: TRINIDAD-1512
> URL: https://issues.apache.org/jira/browse/TRINIDAD-1512
> Project: MyFaces Trinidad
> Issue Type: Bug
> Components: Components
> Affects Versions: 1.2.11-core
> Reporter: Yee-Wah Lee
> Priority: Minor
>
> 1. Create a jsp that uses tr:convertDateTime to display timezone, e.g.
> <af:outputText value="#{demoInput.date}">
> <af:convertDateTime type="both" timeStyle="full"
> timeZone="America/New_York"/>
> </af:outputText>
> where demoInput.date returns the current date, e.g. June 17 09, 1:00 PM
> 2. Run the jsp. For June 17 09 the timezone is actually EDT (GMT - 4).
> Instead it displays as EST
> 6/17/2009 1:00:00 PM GMT-05:00
> If using the JSF standard DateTimeConverter, the output is:
> Jun 17, 2009 1:00:00 PM EDT
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