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Make time zone list expandable in help #26241

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Make time zone list expandable in help #26241

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5f593ae
JENKINS-60635 Replace long timezone list with documentation link in b…
AmoghParmar Feb 2, 2026
884ecb2
JENKINS-20780 Wrap timezone list in collapsible details section
AmoghParmar Feb 3, 2026
f7ade08
Merge branch 'master' into JENKINS-60635-timezone-help-popup
MarkEWaite Feb 3, 2026
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36 changes: 19 additions & 17 deletions core/src/main/resources/hudson/triggers/TimerTrigger/help-spec.jelly
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Expand Up @@ -91,24 +91,26 @@ H H 1,15 1-11 *
first line of the field.
Time zone specification starts with <code>TZ=</code>, followed by the ID of a time zone.
</p>
<p>
Complete example of a schedule with a time zone specification:
</p>
<pre>
TZ=Europe/London
# This job needs to be run in the morning, London time
H 8 * * *
# Butlers do not have a five o'clock, so we run the job again
H(0-30) 17 * * *
</pre>
<p>
The supported time zones depend on the Java runtime Jenkins is running on. The list of supported time zone IDs on this instance is:
Complete example of a schedule with a time zone specification:
</p>
<pre>
TZ=Europe/London
# This job needs to be run in the morning, London time
H 8 * * *
# Butlers do not have a five o'clock, so we run the job again
H(0-30) 17 * * *
</pre>
<p>
The full list of supported time zone IDs depends on the Java runtime Jenkins is running on.
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@daniel-beck daniel-beck Feb 2, 2026

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This makes this help actively unhelpful. Previously you knew exactly what was supported, now it's trial and error.

If the list is too long, wrap it in a <details> or something, so it's only shown after another click.

A reference list of TZ database time zone IDs can be found here:
<a href="https://en.wikipedia.org/wiki/List_of_tz_database_time_zones" target="_blank">
List of tz database time zones
</a>.
</p>
<p>
Most users will not need to set a custom time zone. Only specify one if your job must run
in a different time zone than the Jenkins controller.
</p>
<j:invokeStatic className="java.util.TimeZone" method="getAvailableIDs" var="timeZones"/>
<ul>
<j:forEach items="${timeZones}" var="timeZone">
<li>${timeZone}</li>
</j:forEach>
</ul>
</div>
</j:jelly>
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