rails built in datetime validation

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There’s no built-in ActiveRecord validator for DateTimes, but you can easily add this sort of capability to an ActiveRecord model, without using a plugin, with something like this:

class Thing < ActiveRecord::Base
  validate :happened_at_is_valid_datetime

  def happened_at_is_valid_datetime
    errors.add(:happened_at, 'must be a valid datetime') if ((DateTime.parse(happened_at) rescue ArgumentError) == ArgumentError)
  end
end

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