Start Formula
---------------------
 (Int((Int([Start]-DateValue("21/3/1997 00:00:00"))-Int(Int([Start]-DateValue("21/3/1997 00:00:00"))/1461))/365)+76)
 & "/" & (IIf(((((Int([Start]-DateValue("21/3/1997 00:00:00")))-Int((Int([Start]-DateValue("21/3/1997 00:00:00")))/1461))
 Mod 365))<=186,Int(((((Int([Start]-DateValue("21/3/1997 00:00:00")))-Int((Int([Start]-DateValue("21/3/1997 00:00:00")))
/1461)) Mod 365))/31)+1,Int((((((Int([Start]-DateValue("21/3/1997 00:00:00")))-Int((Int([Start]
-DateValue("21/3/1997 00:00:00")))/1461)) Mod 365))-186)/30)+7)) & "/" & (IIf(((((Int([Start]
-DateValue("21/3/1997 00:00:00")))-Int((Int([Start]-DateValue("21/3/1997 00:00:00")))/1461)) Mod 365))
<=186,Int(((((Int([Start]-DateValue("21/3/1997 00:00:00")))-Int((Int([Start]-DateValue("21/3/1997 00:00:00")))/1461))
 Mod 365)) Mod 31)+1,Int((((((Int([Start]-DateValue("21/3/1997 00:00:00")))-Int((Int([Start]-DateValue("21/3/1997 00:00:00")
))/1461)) Mod 365))-186) Mod 30)+1+(IIf((Int([Start]-DateValue("21/3/1997 00:00:00"))) Mod 1461=0,1,0))))
----------------------------------------------------------------------------------------------------------------------------
Finish Formula
-------------------
(Int((Int([Finish]-DateValue("21/3/1997 00:00:00"))-Int(Int([Finish]-DateValue("21/3/1997 00:00:00"))/1461))/365)+76)
 & "/" & (IIf(((((Int([Finish]-DateValue("21/3/1997 00:00:00")))-Int((Int([Finish]-DateValue("21/3/1997 00:00:00")))/1461))
 Mod 365))<=186,Int(((((Int([Finish]-DateValue("21/3/1997 00:00:00")))-Int((Int([Finish]-DateValue("21/3/1997 00:00:00")))
/1461)) Mod 365))/31)+1,Int((((((Int([Finish]-DateValue("21/3/1997 00:00:00")))-Int((Int([Finish]
-DateValue("21/3/1997 00:00:00")))/1461)) Mod 365))-186)/30)+7)) & "/" & (IIf(((((Int([Finish]
-DateValue("21/3/1997 00:00:00")))-Int((Int([Finish]-DateValue("21/3/1997 00:00:00")))/1461)) Mod 365))
<=186,Int(((((Int([Finish]-DateValue("21/3/1997 00:00:00")))-Int((Int([Finish]-DateValue("21/3/1997 00:00:00")))/1461))
 Mod 365)) Mod 31)+1,Int((((((Int([Finish]-DateValue("21/3/1997 00:00:00")))
-Int((Int([Finish]-DateValue("21/3/1997 00:00:00")))/1461)) Mod 365))-186) Mod 30)+1+(IIf((Int([Finish]-DateValue("21/3/1997 00:00:00"))) Mod 1461=0,1,0))))