Преобразовать TDateTime в Unix TimeStamp

Оформил: DeeCo

{ 
  Sometimes you want to communicate with mySQL or other databases using 
  the unix timestamp. To solve this difference you may want to convert your 
  TDateTime to the unix timestamp format and vice versa. 

  Um den in einigen Datenbanken verwendeten Unix Timestamp fur die Kommunikation 
  mit Delphi nutzbar zu machen, kann man mit dieser Unit das TDateTime Format 
  in den Unix Timestamp und umgekehrt umwandeln. 
}

 unit unix_utils;

 interface

 implementation

 const
   // Sets UnixStartDate to TDateTime of 01/01/1970 
  UnixStartDate: TDateTime = 25569.0;

 function DateTimeToUnix(ConvDate: TDateTime): Longint;
 begin
   //example: DateTimeToUnix(now); 
  Result := Round((ConvDate - UnixStartDate) * 86400);
 end;

 function UnixToDateTime(USec: Longint): TDateTime;
 begin
   //Example: UnixToDateTime(1003187418); 
  Result := (Usec / 86400) + UnixStartDate;
 end;

 end.