Using report variables in report header text

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Apologies if this has already been answered, I searched the KB and both forums for the answer to my question but was not able to find anything.

 

I am putting some reports together for a client and they require these reports to be exported at scheduled intervals on a daily basis. Because of this, I would like to put the date and time the report ran into the header of the report. To do this, I created a replacement value variable called "$datetime", which has the expression "sysdate()". Next I added a text field and set the text to {$datetime}. On running the report, I expected the text field to display the current system date/time, but it does not and instead displays the variable expression (so it