Correcting an error, albeit an inconsequential one:

[Tim]

• Since you start in Chicago standard time, I expect that (assuming

it's implemented) some spelling.of is_dst will record "no, it's not DST" in your dt object. That will never change across the duration of the program. There is no spelling of is_dst today.

s/Chicago standard time/Chicago daylight time/ s/no, it's not/yes, it is/