golang tick and after random lines?

package main

import (
	"fmt"
	//"runtime"
	"time"
)

func main() {
	//runtime.GOMAXPROCS(4)
	t := time.Tick(time.Second)
	ti := time.After(time.Second * 4) //random 3 or 4 lines output?
	for {
		select {
		case <-ti:
			return
		case <-t:
			fmt.Println("now:", time.Now().Format("06-1-02 03:04:05"))//https://github.com/polaris1119/times/blob/master/times.go

		}
	}

}