You could parameter the source file to achieve that. Please ref my example.
Data Flow parameter settings:
Set the source file and move expression in Source Options:
Expressions to rename the source with "name + current date":
concat(substring($filename, 1, length($filename)-4),toString(currentUTC(),'yyyy-MM-dd') )
My full file name is "word.csv", the output file name is "word2020-01-26",
HTH.
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