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Detecting and storing user's timezone in Ruby on Rails automatically

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                  class User < ApplicationRecord
  validates :timezone, presence: true, inclusion: { in: ActiveSupport::TimeZone.all.map(&:name) }

  def local_time
    Time.current.in_time_zone(timezone)
  end
end

                  class ApplicationController < ActionController::Base
  before_action :set_user_timezone, if: :current_user

  private

  def set_user_timezone
    timezone = cookies[:timezone] || "UTC"
    current_user.update(timezone: timezone) if current_user.timezone != timezone
  end
end

                  class AddTimezoneToUsers < ActiveRecord::Migration[7.0]
  def change
    add_column :users, :timezone, :string, null: false, default: "UTC"
  end
end

                  <script>
  document.addEventListener("DOMContentLoaded", function() {
    var timezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
    document.cookie = "timezone=" + timezone + "; path=/";
  });
</script>

This snippet automatically detects and stores a user's timezone by capturing it in JavaScript and saving it in a cookie. On every request, Rails reads this value and updates the user’s timezone in the database if needed. The local_time method then allows easy conversion to user's local time. This is useful for scheduling, notifications, or showing timestamps in the user's time zone.

Martin Sojka

More from Martin Sojka

Detecting and storing user's timezone in Ruby on Rails automatically

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More from Martin Sojka