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    Bug 
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    Resolution: Unresolved
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    P2: Important 
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    None
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    5.12.7
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    None
qcandlestickset does not support negative timestamp. It automatically sets the timestamp to 0 if a negative number is used. Negative number is a valid timestamp. QDateTime supports negative epoch timestamp. For example, the following code will print "1969/09/18".
QDateTime::fromMSecsSinceEpoch(-9000000000).toString("yyyy/MM/dd")