I have a dataframe with two useful columns 1) fiscal year, 2) date. I want to add a new column which shows the fiscal quarter.
FYI - UK Financial year runs from 1 April to 31 March
my data looks like:
fiscal year date
FY15/16 2015-11-01
FY14/15 2014-10-01
FY15/16 2016-02-01
I want it to look like this:
fiscal year date Quarter
FY15/16 2015-11-01 q3
FY14/15 2014-10-01 q3
FY15/16 2016-02-01 q4
Really hope I got the quarters right!
Code below works but I believe it returns American financial quarters but I want UK.
df['Quater'] = df['Date'].dt.quarter
import pandas as pd
df = pd.DataFrame({'date': ['2015-11-01', '2014-10-01', '2016-02-01'],
'fiscal year': ['FY15/16', 'FY14/15', 'FY15/16']})
df['Quarter'] = pd.PeriodIndex(df['date'], freq='Q-MAR').strftime('Q%q')
print(df)
yields
date fiscal year Quarter
0 2015-11-01 FY15/16 Q3
1 2014-10-01 FY14/15 Q3
2 2016-02-01 FY15/16 Q4
The default quarterly frequency Q is equivalent to Q-DEC.
In [60]: pd.PeriodIndex(df['date'], freq='Q')
Out[60]: PeriodIndex(['2015Q4', '2014Q4', '2016Q1'], dtype='int64', freq='Q-DEC')
Q-DEC specifies quarterly periods whose last quarter ends on the last day in December.
Q-MAR specifies quarterly periods whose last quarter ends on the last day in March.
In [86]: pd.PeriodIndex(df['date'], freq='Q-MAR')
Out[86]: PeriodIndex(['2016Q3', '2015Q3', '2016Q4'], dtype='int64', freq='Q-MAR')