thybag

### Keybase proof

I hereby claim:

  * I am thybag on github.
  * I am thybag (https://keybase.io/thybag) on keybase.
  * I have a public key whose fingerprint is 37B8 D8FD E5F3 46E9 DA35  3959 1778 6B9F F6A2 0A2B

To claim this, I am signing this object:

thybag

Its not pretty but it works

Stand alone

(date time being '2017-04-06')

SELECT CONCAT(year('2017-04-06' + INTERVAL -3 MONTH + INTERVAL -5 DAY),'-',YEAR('2017-04-06' + INTERVAL -3 MONTH + INTERVAL -5 DAY)+1) as tax_year

As a function