ruby - How to change default timezone for Active Record in Rails?

Question

In my application.rb I came across the following comment

# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
 config.time_zone = 'Eastern Time (US & Canada)'

As you see from above, I've made config.time_zone to EST time. However, still when records are created in the DB, it looks like datetime is being stored in UTC format.

In the above comment, they say

...and make Active Record auto-convert to this zone...

How can I do that, and where?

Also, I'll be deploying this on heroku as well and i'd like the setting to carry over

Answer 1

I have decided to compile this answer because all others seem to be incomplete.

config.active_record.default_timezone determines whether to use Time.local (if set to :local) or Time.utc (if set to :utc) when pulling dates and times from the database. The default is :utc. http://guides.rubyonrails.org/configuring.html

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If you want to change Rails timezone, but continue to have Active Record save in the database in UTC, use

# application.rb
config.time_zone = 'Eastern Time (US & Canada)'

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If you want to change Rails timezone AND have Active Record store times in this timezone, use

# application.rb
config.time_zone = 'Eastern Time (US & Canada)'
config.active_record.default_timezone = :local

Warning: you really should think twice, even thrice, before saving times in the database in a non-UTC format.

Note
Do not forget to restart your Rails server after modifying application.rb.

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Remember that config.active_record.default_timezone can take only two values

• :local (converts to the timezone defined in config.time_zone)
• :utc (converts to UTC)

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Here's how you can find all available timezones

rake time:zones:all