XSL-Callback for formatting dates and timestamps

[mikey]

There should be some callbacks which allow simple formatting of dates and timestamps within xsl stylesheets. Proposed tags:

<stub:date format="Y-m-d" timestamp="1234567890"/>

Attribute timestamp should be optional, if not set the current timestamp will be used. This callback will use PHP function date().

<stub:localeDate format="%d %b %Y" timestamp="1234567890"/>

Attribute timestamp should be optional, if not set the current timestamp will be used. This callback will use PHP function strftime() with support for localized date strings.

[mikey]

Implemented with r1713. Documentation updated.