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https://stackoverflow.com/questions/6495822/help-grokking-time-and-time-zones-in-rails-3
This is a good question; I also have yet to find good docs about implementing time zones properly. I would add two questions to the list: 6.Is Rails sensitive to Daylight Savings Time and/or how do you implement time zone support that is sensitive? and 7.Is there a difference between how Rails handles time zones and DST for date columns vs. datetime columns? and perhaps 8.
https://guides.rubyonrails.org/v5.1/form_helpers.html
3.4 Time Zone and Country Select. To leverage time zone support in Rails, you have to ask your users what time zone they are in. Doing so would require generating select options from a list of pre-defined TimeZone objects using collection_select, but you can simply use the time_zone_select helper that already wraps this:
https://guides.rubyonrails.org/3_0_release_notes.html
Ruby on Rails 3.0 Release Notes. ... A large amount of work has been done with I18n support in Rails 3, including the latest I18n gem supplying many speed improvements. ... PostgreSQL adapter has had its TIME ZONE support fixed so it no longer inserts incorrect values.
https://makandracards.com/makandra/46009-working-with-or-without-time-zones-in-rails-applications
Rails supports time zones, but there are several pitfalls. Most importantly because Time.now and Time.current are completely different things and code from gems might use one or the other.. Especially configuring an application that cares only about one time zone is a bit tricky.
https://github.com/rails/rails/pull/15726
Jan 15, 2015 · This PR integrates rails#15726, under which `Time` columns should support time zone aware attributes. In order for this to be the **default behavior** …
https://api.rubyonrails.org/v5.2.3/classes/Time.html
Here's an example of how you might set Time.zone on a per request basis and reset it when the request is done. current_user.time_zone just needs to return a string identifying the user's preferred time zone: class ApplicationController < ActionController::Base around_action :set_time_zone def set_time_zone if …
https://github.com/rails/rails/issues/3431
ActiveSupport::TimeWithZone compare fails between Time/DateTime in 3.1 (3.0 works) #3431. ... Works when I use 1.9.2 and rails console. Looks like the time zone parsing is completely different on 1.8.7, not sure if it's related. ... Since this works with 1.9, it will be fine on master, since Rails 4 will only support 1.9.3. That said, this ...
https://api.rubyonrails.org/v5.2.3/classes/ActiveSupport/TimeWithZone.html
A Time-like class that can represent a time in any time zone. Necessary because standard Ruby Time instances are limited to UTC and the system's ENV['TZ'] zone.
https://guides.rubyonrails.org/v3.2/form_helpers.html
3.4 Time Zone and Country Select. To leverage time zone support in Rails, you have to ask your users what time zone they are in. Doing so would require generating select options from a list of pre-defined TimeZone objects using collection_select, but you can simply use the time_zone_select helper that already wraps this:
https://apidock.com/rails/TimeZone
Rails v2.1.0 has built-in time-zone support Rails versions as of 2.1.0 have basic timezone support built-in to the Time object. However, to get a list of all the timezones you need to install the tzinfo gem.
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