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It could be a problem with a leading / trailing space. Perhaps give the DATEPARSE function a shot - http://onlinehelp.tableau.com/v10.3/pro/desktop/en-us/help.htm#data_dateparse.html#dateparse
DATEPARSE("MM/dd/yyyy",trim(Branch Invoice Schedule - Split 1))
Thank you Tom - The DATEPARSE did the trick since the column was already trimmed during the split. I had tried the DATEPARSE before posting, but I had the syntax wrong even though it said it was a valid calculation. Thanks again for point the way!