I was using the following formula when filtering a sheet of data:

=OR(B2=1,AND(OR(B2=2,B2=3),L2<>0,K2=0,I2>=ayearago))

It filters all rows with 1 in column B and any other rows with 2 or 3 in
column B that meet the criteria L2<>0,K2=0,I2>=ayearago (where ayearago is a
named cell containing a date).

I now find myself needing to change this formula to filter for all rows with
1 in column B and any other rows with 2 or 3 in column B that meet the
criteria L2<>0,K2=0,I2>=ayearago and L2<>0,K2>=thirtydaysago,I2>=ayearago.

I have tried but with no success so far.

Thanks in advance.

Gareth