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The builtin managed bean #{startup} returns you the
java.time.temporal.Temporal
instance representing the server's startup time in server's default time zone.
The implementation is provided by org.omnifaces.cdi.config.DateProducer.TemporalDate
which is essentially written as a CDI proxy for java.time.ZonedDateTime because it's a final class.
Historical notice: before OmniFaces 3.6, it returned since OmniFaces 1.0 an instance of java.util.Date
via a <managed-bean> entry in faces-config.xml.
Raw Temporal#toString() value of #{startup}: 2025-12-30T08:43:09.153358531-06:00[America/Chicago] - this should represent same format as java.time.ZonedDateTime
Formatted using o:formatDate() function: 2025-12-30 08:43:09
As java.time.Instant: 2025-12-30T14:43:09.153358531Z - this should represent UTC
Formatted using o:formatDate() function: 2025-12-30 14:43:09
As java.time.ZonedDateTime: 2025-12-30T08:43:09.153358531-06:00[America/Chicago]
Formatted using o:formatDate() function: 2025-12-30 08:43:09
As java.time.LocalDateTime: 2026-01-06T14:37:36.475879109
Formatted using o:formatDate() function: 2026-01-06 14:37:36
As java.time.LocalDate: 2026-01-06
Formatted using o:formatDate() function: 2026-01-06
As epoch time: 1767105789153
<p>
Raw <code>Temporal#toString()</code> value of <code>\#{startup}</code>: <strong>#{startup}</strong> - this should represent same format as <code>java.time.ZonedDateTime</code>
</p>
<p>
Formatted using <code>o:formatDate()</code> function: #{o:formatDate(startup, 'yyyy-MM-dd HH:mm:ss')}
</p>
<hr/>
<p>
As <code>java.time.Instant</code>: <strong>#{startup.instant}</strong> - this should represent UTC
</p>
<p>
Formatted using <code>o:formatDate()</code> function: #{o:formatDate(startup.instant, 'yyyy-MM-dd HH:mm:ss')}
</p>
<hr/>
<p>
As <code>java.time.ZonedDateTime</code>: <strong>#{startup.zonedDateTime}</strong>
</p>
<p>
Formatted using <code>o:formatDate()</code> function: #{o:formatDate(startup.zonedDateTime, 'yyyy-MM-dd HH:mm:ss')}
</p>
<hr/>
<p>
As <code>java.time.LocalDateTime</code>: <strong>#{now.localDateTime}</strong>
</p>
<p>
Formatted using <code>o:formatDate()</code> function: #{o:formatDate(now.localDateTime, 'yyyy-MM-dd HH:mm:ss')}
</p>
<hr/>
<p>
As <code>java.time.LocalDate</code>: <strong>#{now.localDate}</strong>
</p>
<p>
Formatted using <code>o:formatDate()</code> function: #{o:formatDate(now.localDate, 'yyyy-MM-dd')}
</p>
<hr/>
<p>
As <code>epoch time</code>: <strong>#{startup.time}</strong>
</p>