RAD Studio VCL Reference
SysUtils.MaxDateTime Constant

Specifies the highest supported TDateTime value.

MaxDateTime: TDateTime = 2958465.99999;
TDateTime MaxDateTime = 2958465.99999;

MaxDateTime is the most future date : 12/31/9999 23:59:59.999 that the TDateTime type supports. The actual shown value of 2958465.99999 reflects the fact that TDateTime is actually a floating point number, rather than a structured type. The mantissa holds the number of days relative to 12/30/1899 00:00:00.000, the exponent holds a fraction of a day. 


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