CODEWITHSUNDEEP
ruby-on-railsdatetimetimezone
user394016
user394016

Reputation: 59

How to apply time zone on datetime_select in Rails form

I have a form that looks like

= form.datetime_select :due_at
= form.time_zone_select :time_zone, ActiveSupport::TimeZone.us_zones

When this object is saved, we need it to apply the time zone that was selected. For example if the user selects "03-01-2013 11:00" and "Central Time (US & Canada)", I want the date/time, in this case 11AM to be as 11AM CST instead of our application default time zone of "Pacific Time (US & Canada)".

This is actually nested within another form so we cannot simply change Time.zone in the controller with an around_filter. We are trying to figure out a solution that works during daylight savings time as well.

Upvotes: 3

Views: 2934

Answers (1)

Benjamin Sullivan
Benjamin Sullivan

Reputation: 1476

If due_at and time_zone are both attributes of a single model, then you could use a before_save hook to make sure due_at is encoded in the time zone of time_zone before being stored in the database.

class YourModel < ActiveRecord::Base
  before_save :apply_time_zone

  protected

  def apply_time_zone
    self.due_at = ActiveSupport::TimeZone[time_zone].parse "#{due_at_start.to_s(:db)} UTC"
  end
end

ActiveSupport::TimeZone[t].parse(s) will parse s into time zone t, and .to_s(:db) converts a time to string in UTC.

Upvotes: 3

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