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Will take a look before tomorrow night.

cc @tyxia could you take another look when you have some free time?

If @tyxia no explict comments, I think we can merge this after the CI and nit comments are addressed. Thanks for all your time and investment. 🌹

need a main merge, then we can merge this.

%PATH% should have been supported in the Envoy after 1.34.0

The default format that used by Envoy is `%Y-%m-%dT%H:%M:%E3SZ` but current `DateFormtter` even cannot support it correctly. And the `DateFormatter` has tell it could support absl::FormatTime in its comments. https://github.com/envoyproxy/envoy/blob/9537fce85d4f919d4b16de280f0ddf5b0130b8b5/source/common/common/utility.h#L43...