New submission from Joshua Li:

See my SO answer and the corresponding question for detail:

Essentially, given two datetime.datetime instances t1 and t2, the following two 
syntactically different lines of code should be logically equivalent, but in 
fact differ by plus or minus one hour on Daylight Savings Time dates because 
`datetime.datetime.__sub__` does not appear to take DST into account.


I am not sure if this is by intentional design, or a behavioral bug.

components: Library (Lib)
messages: 300035
nosy: JoshuaRLi
priority: normal
severity: normal
status: open
title: timedelta produced by datetime.__sub__ does not take Daylight Savings 
Time into account
type: behavior
versions: Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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