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I add to the SemanticResultFormats/formats/math/SRF_Math.php the lines and can use this Result Formats to calculate dates, for querys like "get the last president" if the president-pages has a date field "starting Job".

This resolution give the timestamp with decimalseparator, so i have to convert the result.

My Example: 
Question: When was my last Review?
Solution: {{#time: Y-m-d|@{{#replace:{{#ask: [[HasReview::{{{1|}}}]] ?DateOfVisit |format=max}}|.|}}}}

Codechange ond SRF_Math.php:
110+ case SMWDataItem::TYPE_TIME:
111+   $numbers[] = $dataItem->getMwTimestamp();
112+   break;

Maybe there is a better solution than getMwTimestamp(), but i dont know the available functions to return as "normal" date.