Set System Time

Could anyone please tell me how to set only the system Time? I've been all over the internet and everything I've found has just confused me. Is there an easy way to set the system Time? Please respond as soon as possible, thanks!
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How about this?

//Public function SetPCSystemTime changes the system date and time.
//Parameter(s): tDati  The new date and time//Returns:      True if successful
//              False if not
function SetPCSystemTime(tDati: TDateTime): Boolean;
  tSetDati: TDateTime;
  vDatiBias: Variant;  
  tTZI: TTimeZoneInformation;  
  tST: TSystemTime;

   vDatiBias := tTZI.Bias / 1440;
   tSetDati := tDati + vDatiBias;      
   with tST do  
        wYear := StrToInt(FormatDateTime('yyyy', tSetDati));
        wMonth := StrToInt(FormatDateTime('mm', tSetDati));
        wDay := StrToInt(FormatDateTime('dd', tSetDati));
        wHour := StrToInt(FormatDateTime('hh', tSetDati));
        wMinute := StrToInt(FormatDateTime('nn', tSetDati));
        wSecond := StrToInt(FormatDateTime('ss', tSetDati));
        wMilliseconds := 0;  
   SetPCSystemTime := SetSystemTime(tST);



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