[go] time.Until

timeUntil.go

package main

import (
	"log"
	"time"
)

func main() {
	log.Println("start.")
	defer log.Println("end.")

	quit := make(chan bool)
	go func() {
		// time.Sleep(time.Second)
		timeString := "2020-01-08T22:50:00+09:00"
		log.Println("wait until", timeString)

		startAt, err := time.Parse(time.RFC3339, timeString)
		if err != nil {
			log.Fatal("Parse error.", err)
		}
		time.Sleep(time.Until(startAt))
		quit <- true
	}()
	<-quit
}

output

u110:~/go/src/golangProjects/sandbox $ go run timeUntil.go 
2020/01/08 22:49:39 start.
2020/01/08 22:49:39 wait until 2020-01-08T22:50:00+09:00
2020/01/08 22:50:00 end.

https://golang.org/pkg/time/#Until