function name An intuitive way to format date and time time.Duration time API timeパッケージ Timer Ticker time.Time date/time time "Package time" time.Time time API Time.IsZero() time.Format defines date formatting Time time time.AfterFunc Reset Formatting time time.Format Duration time Duration time package time API Time: golang.org time.After Timer time.Sleep time "Package time" time.Now time.Sleep Location time Timer Ticker Time.IsZero() time.Time Format time