Compute time zones on all platforms with tzinfo gem

[ashmaroli]

• This is a 🙋 feature or enhancement.
• I've added tests

Summary

Calculate Time Zone with tzinfo library on all platforms

• Reverts Upgrade WinTZ utility to use TZInfo-2.0 #7521 and adds tzinfo 1.x as a runtime_dependency of Jekyll
  The revert is because activesupport gem currently locks to tzinfo 1.x. Even though Jekyll has no direct dependency on activesupport, there may be plugins out there that depend on a recent version of ActiveSupport.
• Renames Utils::WinTZ module as Utils::TimeZone

Context

Resolves #7550

[mattr-]

Does this do anything to resolve #5963?

[ashmaroli]

Does this do anything to resolve #5963?

@mattr- Honestly, I did not even realize that a similar issue was previously reported. The current pull request is a direct reaction to the failing cucumber test in 4e68111 in this pull request.
(Notably, the tests fail on Travis on all tested Ruby versions but not on AppVeyor)

I'll try and test further to check if this issue is a regression due to cf5c689 shipped in Jekyll-3.7.1

[ashmaroli]

@mattr- From my investigation, the inference is that #5963 was resolved by #6697.
This PR attempts to clear out an aspect overlooked in #6697: post data with date, time and time zone.
I feel this issue was overlooked in the tests because the scenarios were set to UTC time zone.

Disclaimer: I'm not currently sure if the tests here will fail when changes due to DST kick in..

[mattr-]

Let's get the conflicts resolved and CI passing so this can be merged.

[scottdorman]

What will it take to move this PR forward and get it merged (besides the obvious of fixing the merge conflicts)? It's been over a year since the PR was submitted and about 6 months since the changes in the PR were approved.

[ashmaroli]

@scottdorman Sorry for the delay, but technically, we're sort of at a stalemate here.
The tests show that the behavior is flaky and changes with DST changes.

And then there's the issue with dependencies.. The current timezone management in Jekyll requires the gem tzinfo-1.x but then that would cause issues with an indirect dependency gem named activesupport whose newer versions do not support
tzinfo-1.x...

So in other words, its a messy situation..
Was hoping if someone from the community could propose a better solution..

[scottdorman]

@ashmaroli Thanks for the update. On the surface, it seems like such a simple thing to fix. :) It seems like doing something around using UTC dates here would be the solution, or at least part of the solution, since that should remove the issues around DST changes.