如何将日历年转换为财政年

Question

试图将日历年转换为财务年。 我有一个 dataframe，如下所示。 每个ID都会有多条记录。 并且记录可能缺少月份，例如第 3 行缺少 3 个月

 df:

ID  Callender Date 
1   01-01-2022
1   01-02-2022 
1   01-04-2022 
1   01-05-2022
1   01-05-2022
2   01-01-2022
2   01-07-2023

预计 output：

由于财政年度从 7 月开始到 6 月，例如：2022 财年意味着：

IE

July -2021  - This is 1st month in the financial year, 
August- 2021 - This is 2nd month in the financial year
Sep -2021 - This is 3rd month in the financial year
Oct -2021 - This is 4th month in the financial year
Nov 2021 - - This is 5th month in the financial year
Dec 2021- - This is 6th month in the financial year
jan 2022- This is 7th month in the financial year
feb 2022- This is 8th month in the financial year
March 2022- This is 9th month in the financial year
April 2022- This is 10th month in the financial year
May 2022- This is 11th month in the financial year
June 2022- This is 12th month in the financial year`

预期 output：将 Callender 年份转换为财政年度：

 ID  Callender_Date    Financial_Year    Fiscal_Month
    1   01-01-2022         2022             7
    1   01-02-2022         2022             8
    1   01-04-2022         2022             10
    1   01-05-2022         2022             11
    1   01-06-2022         2022             12
    2   01-01-2021         2021             7
    2   01-07-2021         2022             1`

尝试使用以下代码 - 在其他一些问题中找到

df['Callender_Date '] = df['Callender_Date '].asfreq('J-July') - 1

Answer 1

尝试：

# convert the column to datetime (if not already):
df['Callender_Date'] = pd.to_datetime(df['Callender_Date'], dayfirst=True)

df['Financial_Year'] =df['Callender_Date'].dt.to_period('Q-JUL').dt.qyear
df['Fiscal_Month'] = (df['Callender_Date'] + pd.DateOffset(months=6)).dt.month
print(df)

印刷：

   ID Callender_Date  Financial_Year  Fiscal_Month
0   1     2022-01-01            2022             7
1   1     2022-02-01            2022             8
2   1     2022-04-01            2022            10
3   1     2022-05-01            2022            11
4   1     2022-06-01            2022            12
5   2     2021-01-01            2021             7
6   2     2021-07-01            2021             1