Commit(s) to merge

b0236fd

Target

beta and stable

Prepared changelist for beta/stable

https://dart-review.googlesource.com/c/sdk/+/358420
https://dart-review.googlesource.com/c/sdk/+/358440

Issue Description

DateTime.timeZoneName returns incorrect value on Windows when the machine is in the summer time but the given moment is in the standard time and vice versa.

What is the fix

Fix the implementation of the function to use the given moment rather then to look at the current time zone.

Why cherry-pick

There is a test failing on stable and beta branches - which makes other cherry picks harder.

Risk

low

Issue link(s)

#55159

Extra Info

/cc @a-siva