Why does Pandas .floor() throw AmbiguousTimeError for this Timestamp that’s already unambiguous?

The following fails:

Why does Pandas .floor() throw AmbiguousTimeError for this Timestamp that’s already unambiguous?

The following fails:

Why does Pandas .floor() throw AmbiguousTimeError for this Timestamp that’s already unambiguous?

The following fails:

Why does Pandas .floor() throw AmbiguousTimeError for this Timestamp that’s already unambiguous?

The following fails:

How to deal with datetime stored in local time?

I am working with a dataset where timestamps are stored in a CSV file in local time. Let’s attempt to generate such timestamps:

How to deal with datetime stored in local time?

I am working with a dataset where timestamps are stored in a CSV file in local time. Let’s attempt to generate such timestamps: