Hola Carlos
Te paso un código alguna vez posteado por LMG que te permite cambiar fecha y hora de archivos
*!* Modificar la Fecha Hora de un archivo
*!* Uso:
*!* m.lRsltC=WinSetFileTime("C:\Imagenes\Foto.JPG","c",2001,08,29,18,01,01,300)
*!* m.lRsltW=WinSetFileTime("C:\Imagenes\Foto.JPG","w",2001,08,29,18,01,04,000)
*!* m.lRsltA=WinSetFileTime("C:\Imagenes\Foto.JPG","a",2001,08,30,0,0,0,000)
*!*
*!* m.cTimeType
*!* c - creación (default)
*!* a - acceso
*!* w - escritura
*!*
*!* FechaHora Creación
? WinSetFileTime("C:\MiImagen.jpg","c",2002,01,01,18,59,59,300)
*!*
*!* FechaHora último acceso
? WinSetFileTime("C:\MiImagen.jpg","a",2002,01,02,18,59,59,300)
*!*
*!* FechaHora Modificación
? WinSetFileTime("C:\MiImagen.jpg","w",2002,01,03,18,59,59,300)
*!*
PROCEDURE WinSetFileTime
LPARAMETERS m.uFl, m.cTimeType, m.nYear, m.nMonth,;
m.nDay, m.nHour, m.nMinute, m.nSec, m.nThou
#DEFINE OF_READWRITE 2
LOCAL m.lpFileInformation, m.cS, m.nPar, m.fh,;
m.lpFileInformation, m.lpSYSTIME, m.cCreation,;
m.cLastAccess, m.cLastWrite, m.cBuffTime, m.cBuffTime1,;
m.cTT,m.nYear1, m.nMonth1, m.nDay1, m.nHour1,;
m.nMinute1, m.nSec1, m.nThou1
m.nPar=PARAMETERS()
IF m.nPar < 1
RETURN .F.
ENDIF
DO DECL && declara funciones externas
m.cTT=IIF(m.nPar>=2 AND TYPE("m.cTimeType")="C";
AND !EMPTY(m.cTimeType),LOWER(SUBSTR(m.cTimeType,1,1)),"c")
m.nYear1=IIF(m.nPar>=3 AND TYPE("m.nYear")$"FIN";
AND m.nYear>=1800,ROUND(m.nYear,0),-1)
m.nMonth1=IIF(m.nPar>=4 AND TYPE("m.nMonth")$"FIN";
AND BETWEEN(m.nMonth,1,12),ROUND(m.nMonth,0),-1)
m.nDay1=IIF(m.nPar>=5 AND TYPE("m.nDay")$"FIN";
AND BETWEEN(m.nDay,1,31),ROUND(m.nDay,0),-1)
m.nHour1=IIF(m.nPar>=6 AND TYPE("m.nHour")$"FIN";
AND BETWEEN(m.nHour,0,23),ROUND(m.nHour,0),-1)
m.nMinute1=IIF(m.nPar>=7 AND TYPE("m.nMinute")$"FIN";
AND BETWEEN(m.nMinute,0,59),ROUND(m.nMinute,0),-1)
m.nSec1=IIF(m.nPar>=8 AND TYPE("m.nSec")$"FIN";
AND BETWEEN(m.nSec,0,59),ROUND(m.nSec,0),-1)
m.nThou1=IIF(m.nPar>=9 AND TYPE("m.nThou")$"FIN";
AND BETWEEN(m.nThou,0,999),ROUND(m.nThou,0),-1)
m.lpFileInformation = REPLI (CHR(0), 53)
m.lpSYSTIME = REPLI (CHR(0), 16)
IF GetFileAttributesEx (m.uFl, 0, @lpFileInformation) = 0
RETURN .F.
ENDIF
m.cCreation = SUBSTR(m.lpFileInformation,5,8)
m.cLastAccess = SUBSTR(m.lpFileInformation,13,8)
m.cLastWrite = SUBSTR(m.lpFileInformation,21,8)
m.cBuffTime = IIF(m.cTT="w",m.cLastWrite,;
IIF(m.cTT="a",m.cLastAccess,m.cCreation))
FileTimeToSystemTime(m.cBuffTime, @lpSYSTIME)
m.lpSYSTIME=;
IIF(m.nYear1>=0,Int2Word(m.nYear1),SUBSTR(m.lpSYSTIME,1,2))+;
IIF(m.nMonth1>=0,Int2Word(m.nMonth1),SUBSTR(m.lpSYSTIME,3,2))+;
SUBSTR(m.lpSYSTIME,5,2)+;
IIF(m.nDay1>=0,Int2Word(m.nDay1),SUBSTR(m.lpSYSTIME,7,2))+;
IIF(m.nHour1>=0,Int2Word(m.nHour1),SUBSTR(m.lpSYSTIME,9,2))+;
IIF(m.nMinute1>=0,Int2Word(m.nMinute1),SUBSTR(m.lpSYSTIME,11,2))+;
IIF(m.nSec1>=0,Int2Word(m.nSec1),SUBSTR(m.lpSYSTIME,13,2))+;
IIF(m.nThou1>=0,Int2Word(m.nThou1),SUBSTR(m.lpSYSTIME,15,2))
SystemTimeToFileTime(m.lpSYSTIME,@cBuffTime)
m.cBuffTime1=m.cBuffTime
LocalFileTimeToFileTime(m.cBuffTime1,@cBuffTime)
DO CASE
CASE m.cTT = "w"
m.cLastWrite=m.cBuffTime
CASE m.cTT = "a"
m.cLastAccess=m.cBuffTime
OTHERWISE
m.cCreation=m.cBuffTime
ENDCASE
m.fh = _lopen (m.uFl, OF_READWRITE)
IF m.fh < 0
RETURN .F.
ENDIF
SetFileTime (m.fh,m.cCreation,;
m.cLastAccess, m.cLastWrite)
_lclose(m.fh)
RETURN .T.
ENDPROC
*!*
PROCEDURE Int2Word
LPARAMETERS m.nVal
RETURN CHR(MOD(m.nVal,256)) + CHR(INT(m.nVal/256))
ENDPROC
*!*
PROCEDURE DECL
DECLARE INTEGER SetFileTime IN kernel32;
INTEGER hFile,;
STRING lpCreationTime,;
STRING lpLastAccessTime,;
STRING lpLastWriteTime
DECLARE INTEGER GetFileAttributesEx IN kernel32;
STRING lpFileName,;
INTEGER fInfoLevelId,;
STRING @ lpFileInformation
DECLARE INTEGER LocalFileTimeToFileTime IN kernel32;
STRING LOCALFILETIME,;
STRING @ FILETIME
DECLARE INTEGER FileTimeToSystemTime IN kernel32;
STRING FILETIME,;
STRING @ SYSTEMTIME
DECLARE INTEGER SystemTimeToFileTime IN kernel32;
STRING lpSYSTEMTIME,;
STRING @ FILETIME
DECLARE INTEGER _lopen IN kernel32;
STRING lpFileName, INTEGER iReadWrite
DECLARE INTEGER _lclose IN kernel32 INTEGER hFile
ENDPROC
*!*
Saludos