code: func (o *Options) EffectiveCronString() string {
  	if o.Cron != "" {
  		return o.Cron
  	}
  	if o.Every > 0 {
  		return "@every " + o.Every.String()
  	}
  	return ""
  }
docs: // EffectiveCronString returns the effective cron string of the options.
  // If the cron option was specified, it is returned.
  // If the every option was specified, it is converted into a cron string using "@every".
  // Otherwise, the empty string is returned.
  // The value of the offset option is not considered.