intershop get date in .isml template

I need to check the condition:

<isif condition="#not ((Product:QLC_Enable EQ 'true') AND (Product:QLC_ValidTo > NOW) AND (Product:QLC_Quantity < 1))#">                        
    <span class="items-in-stock align-left">
        <isinclude template="product/inc/CC_StockStatus"/>
    </span>
</isif>

But it seems that it is incorrect to use this segment:

Product:QLC_ValidTo > NOW

Particularly the problem is the syntax for ‘NOW’. I have no idea how it should be set and cannot find out in their documentation.

Can anybody help?