I have this code, but it doesn´t work.
PLease checkout...

public totalpaginas
use ttidist
set order to tag fecha
inicio={^1999/11/01}
final={^1999/11/25}
report form repopdis for betw(fecha_opr,inicio,final) to file prueba.tmp noconsole
totalpaginas = _pageno
report form repopdis for betw(fecha_opr,inicio,final) preview