Historical sales totals/running sum in pivot table?

Hi Analytics Brain Trust! 

I may be overthinking this, but haven't gotten it to work yet.

Is there a way to get a running sum of tickets sold as of past order dates in a pivot table? I'm envisioning day in order date as rows and the cumulative number of tickets sold as of that day as a column. I don't need to get a snapshot without later changes, returns, etc. But I do want each date to exclude sales from later order dates. I know this is usually RSUM line chart territory, but I need the numbers in this instance. 

Thanks in advance for any help! 

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