MetaStock -> Tools -> Indicator Builder -> New
Copy and paste formulae below.


===========
Date filter
===========
---8<---------------------------

{ Date filter }
{ Plots +1 signal within user-input date period }
{ http://www.metastocktools.com }

StDay:=Input("start Day",1,31,1);
StMnth:=Input("start Month",1,12,1);
StYear:=Input("start Year",1800,2200,2003);
EnDay:=Input("end Day",1,31,31);
EnMnth:=Input("end Month",1,12,12);
EnYear:=Input("end Year",1800,2200,2003);

start:=Year()>StYear
 OR (Year()=StYear AND (Month()>StMnth
 OR Month()=StMnth AND DayOfMonth()>=StDay));
end:=Year()<EnYear
 OR (Year()=EnYear AND (Month()<EnMnth
 OR Month()=EnMnth AND DayOfMonth()<=EnDay));

start AND (end OR (start AND Alert(start=0,2)))

---8<---------------------------


==============================
Date filter sample application
==============================
---8<---------------------------

{ Open/Hi/Lo/Close of specified date period }
{ http://www.metastocktools.com }

{ Date inputs }
StDay:=Input("start Day",1,31,1);
StMnth:=Input("start Month",1,12,12);
StYear:=Input("start Year",1800,2200,2004);
EnDay:=Input("end Day",1,31,31);
EnMnth:=Input("end Month",1,12,12);
EnYear:=Input("end Year",1800,2200,2004);

{ Selected date period }
start:=Year()>StYear
 OR (Year()=StYear AND (Month()>StMnth
 OR Month()=StMnth AND DayOfMonth()>=StDay));
end:=Year()<EnYear
 OR (Year()=EnYear AND (Month()<EnMnth
 OR Month()=EnMnth AND DayOfMonth()<=EnDay));
date:=
start AND (end OR (start AND Alert(start=0,2)));

{ Open/Hi/Lo/Close for date period }
Op:=ValueWhen(1,date=1 AND Alert(date=0,2),O);
Hi:=Highest(ValueWhen(1,date,H));
Lo:=Lowest(ValueWhen(1,date,L));
Cl:=ValueWhen(1,
 date=0 AND Alert(date,2),Ref(C,-1));

{ Plot on price chart }
Op;  { Black }
Hi;  { Red   }
Lo;  { Blue  }
Cl;  { Green }

---8<---------------------------


============
Date signals
============
---8<---------------------------

{Date signals}
{Plots +1/-1 signals on user-input dates}
{http://www.metastocktools.com}

StDay:=Input("start Day",1,31,1);
StMnth:=Input("start Month",1,12,1);
StYear:=Input("start Year",1800,2200,2003);
EnDay:=Input("end Day",1,31,31);
EnMnth:=Input("end Month",1,12,12);
EnYear:=Input("end Year",1800,2200,2003);

today:=Year()+Month()/12+DayOfMonth()/373;
stInput:=StYear+StMnth/12+StDay/373;
endInput:=EnYear+EnMnth/12+EnDay/373;
start:=stInput>Ref(today,-1) AND stInput<=today;
end:=endInput>Ref(today,-1) AND endInput<=today;
signals:=If(start=end,start,start-end);

signals

---8<---------------------------


===========
Time filter
===========
---8<---------------------------

{Intraday time filter}
{Plots +1 signal within user-input time period}
{http://www.metastocktools.com}

StHour:=Input("start Hour",0,23,12);
StMin:=Input("start Minute",0,59,1);
EnHour:=Input("end Hour",0,23,14);
EnMin:=Input("end Minute",0,59,15);

start:=Hour()>StHour
 OR Hour()=StHour AND Minute()>=StMin;
end:=Hour()<EnHour
 OR Hour()=EnHour AND Minute()<=EnMin;

start AND (end OR (start AND Alert(start=0,2)))

---8<---------------------------


http://www.metastocktools.com