Sorting dates in an acknowledgment

Does anyone know how to sort the dates in an xsl file? I have no clue. I have Infomaker and SSRS but haven't only seriously edited any documents. Our acknowledgments are being emailed with the dates as they are built in the package which is by theater not in date order. I don't even know where to begin but I'd like to make it easier on the patron's when viewing the confirmation. 

Thanks in advance. 

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