how to get last date from last year from a given date in pandas

Question

I am looking for a solution to get from a date (timestamp), the last date of the previous year. For Example

date = '2021-01-31' or '2021-04-25' . i expect '2020-12-31'

import pandas as pd
report_date = '2021-01-31'
report_date_tsmp = pd.Timestamp(report_date)

thanks for solutions!

Answer 1

Quick and dirty:

pd.Timestamp(f'12-31-{report_date_tsmp.year - 1}')

Less dirty with offset:

report_date_tsmp - pd.offsets.YearEnd()

Output:

Timestamp('2020-12-31 00:00:00')