A Formula for Easter
Easter is in this month:
Int( (Mod( 19 * Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) + 13)/25) + 15 , 30) - Int( ( Mod(Year, 19) + 11*Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) + 13)/25) + 15 , 30) )/319 ) + Mod( 2*Mod(Int(Year/100), 4) + 2*Int(Mod(Year, 100)/4) - Mod(Mod(Year, 100),4) - Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) + 13)/25) + 15 , 30) + Int( ( Mod(Year, 19) + 11*Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) + 13)/25) + 15 , 30) )/319) + 32 , 7) + 90) /25);
On this day:
Mod( Mod(19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) +13)/25) + 15, 30) - Int( ( Mod(Year, 19) + 11*Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) +13)/25) + 15, 30) )/319 ) + Mod( 2*Mod(Int(Year/100), 4) + 2*Int(Mod(Year, 100)/4) - Mod(Mod(Year, 100),4) - Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) +13)/25) + 15, 30) + Int( ( Mod(Year, 19) + 11*Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) +13)/25) + 15, 30) )/319 ) + 32, 7) + Int( ( Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) +13)/25) + 15, 30) - Int( ( Mod(Year, 19) + 11*Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) +13)/25) + 15, 30) )/319 ) + Mod( 2*Mod(Int(Year/100), 4) + 2*Int(Mod(Year, 100)/4) - Mod(Mod(Year, 100),4) - Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) +13)/25) + 15, 30) + Int( ( Mod(Year, 19) + 11*Mod( 19*Mod(Year, 19) + Int(Year/100) - Int(Int(Year/100)/4) - Int((8*Int(Year/100) + 13)/25) + 15, 30) )/319 ) + 32, 7) + 90 )/25 ) + 19, 32)
…use find & replace to adapt to your required syntax.