Date based conditional items in templates

[MrEyes]

Unfortunately, when trying that I get the following error:

The following template conditional expression contains function calls:

<if condition="$thread['dateline'] < (TIMENOW - (28 * 24 * 60 * 60))">

With a few exceptions, function calls are not permitted in template conditional expressions. Please go back and re-write this expression.

The following functions are allowed in template conditional expressions:
in_array() is_array() is_numeric() isset() empty() defined() array() can_moderate() can_moderate_calendar() exec_switch_bg() is_browser() is_member_of()

--------------- Added [DATE]1203175879[/DATE] at [TIME]1203175879[/TIME] ---------------

After a little fiddling the following works:

<if condition="$thread['dateline'] < TIMENOW - 2419200">
<p>test - this should only display in threads older than a month</p>
</if>

The VB parser obviously doesnt like the (x * y * z) part