BUG: pandas.tseries.offsets.DateOffset behavior changes

[iajoiner]

Pandas version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pandas.

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

import pandas as pd

s = pd.Series(pd.to_datetime('2022-02-04'))
s = s + pd.DateOffset(1)
print(s)

Issue Description

This code snippet produces a series with a date. In Pandas 1.3.5 the date is 2022-02-05. On the other hand in Pandas 1.4.0 the date is abruptly changed to 2022-02-04 which means a API breaking change which is against the Pandas version policy has happened.

Expected Behavior

This code snippet should produce a series with the date is 2022-02-05.

Installed Versions

1.4.0

[iajoiner]

I'm basically reopening #45643. As an open source developer who has a PR here I think this issue needs to be addressed one way or another.

[simonjayhawkins]

first bad commit: [cd5a124] FIX BUG: Timestamp add/sub DateOffset with nanoseconds lost. (#43968)