RAD Studio VCL Reference
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SysUtils.DateDelta Constant

Specifies the difference between TDateTime and TTimeStamp starting values.

Pascal
DateDelta = 693594;
C++
DateDelta = 693594;

SysUtils

DateDelta is the number of days (693594) between January 1, 0001 (starting TTimeStamp value), and December 31, 1899 (starting TDateTime value). This value is useful for converting date-time values between TTimeStamp and TDateTime. 

 

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