The services are not reliable enough to be tested as unittest.
Closes#13264
(grafted from 0c4d2eb959e66e5e48b27ea22f8c856eb7b419e2)
--HG--
branch : 7.0
The fiscal years are created centered on the passed date such that if the
current day change during the execution, the fiscal year is still usable.
Also fiscal year can be created for a range of dates such that it is guarantee
that the dates are in the fiscal year.
And finally remove datetime and dateutil import when they are not used.
Closes#9977