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Modify the cronExpression property of the mailPollTrigger bean in schedulingSubsystemContext.xml
file.
In Confluence installation directory, this file is jarred in <confluence installation directory>/confluence/WEB-INF/lib/confluence-x.x.jar.
Unzipping the file and placing it WEB-INF/classes folder will over ride the configuration from the jarred version.
For example, the expression below will fire at 12pm (noon) every day:
<property name="cronExpression"> <value>0 0 12 * * ?</value> </property>
Cron expression
You may also like to view an information on how to create Cron expressions to provide the ability to specify complex time combination.
http://quartz.sourceforge.net/javadoc/org/quartz/CronTrigger.html
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