Support timezone using timezone-js.

[chotiwat]

A pull request for #38. Please review. Thanks.

[jkbrzt]

Thanks, @chotiwat! There seem to be many failing tests — do they not fail for you?

[chotiwat]

Oh, I forgot to mention that you need to install Olson time zone files into tests/vendor/tz. Please see https://github.com/mde/timezone-js#setup for the installation instruction.

All tests passed perfectly for me on Firefox. However, on Chromium-based browsers, you need to set up a static web server since they don't allow AJAX requests on local time zone files. And there will be one failing test, saying "America/New_York" is not loaded, which can be fixed by delaying that test for a few seconds with setTimeout.

[jkbrzt]

Thanks a lot. The approach now being discussed in #38 might actually be even a better solution (i.e., using UTC instead of local timezone). Let's see if that would be possible to implement before merging this in.

[arolson101]

Hi! I'm trying to clear out bugs and PRs. If this PR is still wanted/relevant, please comment and/or fix the conflicts!

[davidgoli]

Closing due to inactivity.