[RUBY] About ActiveRecord default_timezone

Assumed version

Ruby 2.5 series Ruby on Rails 5.2 series


In Rails, the timezone of the time stamp issued by ActiveRecord is defined in config/application.rb.

# config/application.rb 

Rails.application.configure do
  config.active_record.default_timezone = :local
  # (ActiveRecord::Base.default_timezone = :Synonymous with local)

What this: local refers to is the ruby ​​process timezone. The ruby ​​process timezone looks at the environment variable TZ defined in the OS. In other words, if you don't set this environment variable, ActiveRecord will issue a timestamp with the default UTC.

For example, if you define as follows, created_at and updated_at will be the time in Tokyo.


Difference from config.time_zone

Speaking of time zones set in Rails, I think that there are also the following people.

Rails.application.configure do
  config.time_zone = 'Tokyo'

This is a setting that allows you to set the time zone acquired by Time.zone to Tokyo.

You can get the current time in Tokyo by hitting Time.zone.now on the application.


Rails Time Zone Summary

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