Rails timezones difference

  • In Rails, Time.zone refers to the Rails (not system) timezone, set by config.time_zone (typically in application.rb)
  • DateTime and Time are not otherwise Rails aware, therefore, DateTime.now and Time.now both return times in the system timezone.
  • 1.month.ago and similar methods use the Rails timezone, but DateTime.now.last_month uses the system timezone
  • When retrieving things from ActiveRecord, they will be timezoned to the Rails timezone, so Product.first.created_at will give you a time in the Rails timezone (not the system timezone)

So, don’t mix Rails timezone methods like “1.month.ago” with system timezone methods like “DateTime.now.last_month”

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