This would be really awesome. EVERYONE (with no exaggeration) who has seen these dates has been confused and gone off into a tangent as to why it makes no sense.
My personal suggestion would be to allow us to set a 'Fiscal year prefix', so that we could select 'FY', but another company might have a different convention, or show nothing at all. Your UX people may well have a better solution. :)
Definitely custom - our FY runs Aug to July and having custom fields would be required
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