Fiscal year the Period lies in according to its starting-quarter.
The year and the qyear of the period will be the same if the fiscal
and calendar years are the same. When they are not, the fiscal year
can be different from the calendar year of the period.
The fiscal year of the period.
Return the calendar year of the period.
If the natural and fiscal year are the same, qyear and year will
be the same.
>>> per = pd.Period('2018Q1', freq='Q')
If the fiscal year starts in April (Q-MAR), the first quarter of
2018 will start in April 2017. year will then be 2018, but qyear
will be the fiscal year, 2018.
>>> per = pd.Period('2018Q1', freq='Q-MAR')