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function FloatToDateTime(const Value: Extended): TDateTime; overload;
Returns a TDateTime value from a floating point value.
If Value is not within the valid range for TDateTime, FloatToDateTime raises an EConvertError exception; min and max TDateTime values are defined as constants:
const
MinDateTime: TDateTime = -657434.0; { 01/01/0100 12:00:00.000 AM }
MaxDateTime: TDateTime = 2958465.99999; { 12/31/9999 11:59:59.999 PM }
var aDateTime: string;
aDateTime := FloatToDateTime(0);
//aDateTime == 12/30/1899
aDateTime := FloatToDateTime(10);
//aDateTime == 09/01/1900
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TDateTime,
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