How to enter the current time and the current date into the text of a Wiki page:

This

This server lives on [{INSERT CurrentTimePlugin format=zzzz}]
and the time here is [{INSERT CurrentTimePlugin format='HH:mm \'on\' dd-MMM-yyyy'}].

produces this

This server lives on Eastern European Time and the time here is 14:06 on 11-Feb-2012.

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How to show the current time and the current date in a template:

Use the plugin inside a TranslateTag:

<wiki:Translate>[{INSERT CurrentTimePlugin}]</wiki:Translate>