Historical Price Quotes returned do not include the last day in the specified Date Range.
When manually entering a historical range, for example 12/15/2019 - 12/31/2019, the actual quotes returned do NOT include the last day in the range (12/31/2019).
The price quotes returned leave off the last day in the Date Range.
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William J Greene commented
I make a minor edit to my earlier post.
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William J Greene commented
Minor edit of earlier comment.