def acquired_at_range_valid?
    if acquired_at_from.present? && acquired_at_to.present?
      if (/^[0-9]{4}-[0-9]{2}$/ =~ acquired_at_from && /^[0-9]{4}-[0-9]{2}$/ =~ acquired_at_to) || (/^[0-9]{4}-[0-9]{2}-[0-9]{2}$/ =~ acquired_at_from && /^[0-9]{4}-[0-9]{2}-[0-9]{2}$/ =~ acquired_at_to)
      
        if acquired_at_from > acquired_at_to