Hi @Will Faulkner ,
You may try like this:
=DATESERIAL(cstr(Year(today())-1) - (IIF(format(now(),"MMdd") > "0331",0,1)) ,4,1) 【1/4/2019】
=DATESERIAL(cstr(Year(Now())-1) + (IIF(format(now(),"MMdd") > "0331",1,0)) ,3,31) 【31/3/2020】
Regards,
Zoe
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