Running code at noon in Golang

Is it possible to execute code at a noon everyday? The program is handling user input the rest of its run time but needs to run a function at noon to output some text. What is the most effective way to do this?

So you need Interval Timer to run one function at noon everyday, you may use:
timer.AfterFunc() or time.Tick() or time.Sleep() or time.Ticker

first when program starts calculate time interval for start up time till first next noon and use some wait (e.g. time.Sleep or ...) then use 24 * time.Hour interval for the next interval.

sample code using time.Sleep:

package main

import "fmt"
import "time"

func noonTask() {
    fmt.Println(time.Now())
    fmt.Println("do some job.")
}
func initNoon() {
    t := time.Now()
    n := time.Date(t.Year(), t.Month(), t.Day(), 12, 0, 0, 0, t.Location())
    d := n.Sub(t)
    if d < 0 {
        n = n.Add(24 * time.Hour)
        d = n.Sub(t)
    }
    for {
        time.Sleep(d)
        d = 24 * time.Hour
        noonTask()
    }
}
func main() {
    initNoon()
}

and you may change main to this (or any thing you need):

func main() {
    go initNoon()

    // do normal task here:
    for {
        fmt.Println("do normal task here")
        time.Sleep(1 * time.Minute)
    }
}

using timer.AfterFunc:

package main

import (
    "fmt"
    "sync"
    "time"
)

func noonTask() {
    fmt.Println(time.Now())
    fmt.Println("do some job.")
    timer.AfterFunc(duration(), noonTask)
}
func main() {
    timer.AfterFunc(duration(), noonTask)
    wg.Add(1)
    // do normal task here
    wg.Wait()
}

func duration() time.Duration {
    t := time.Now()
    n := time.Date(t.Year(), t.Month(), t.Day(), 12, 0, 0, 0, t.Location())
    if t.After(n) {
        n = n.Add(24 * time.Hour)
    }
    d := n.Sub(t)
    return d
}

var wg sync.WaitGroup

using time.Ticker:

package main

import (
    "fmt"
    "sync"
    "time"
)

var ticker *time.Ticker = nil

func noonTask() {
    if ticker == nil {
        ticker = time.NewTicker(24 * time.Hour)
    }
    for {
        fmt.Println(time.Now())
        fmt.Println("do some job.")
        <-ticker.C
    }
}
func main() {
    timer.AfterFunc(duration(), noonTask)
    wg.Add(1)
    // do normal task here
    wg.Wait()
}

func duration() time.Duration {
    t := time.Now()
    n := time.Date(t.Year(), t.Month(), t.Day(), 12, 0, 0, 0, t.Location())
    if t.After(n) {
        n = n.Add(24 * time.Hour)
    }
    d := n.Sub(t)
    return d
}

var wg sync.WaitGroup

and see:
https://github.com/jasonlvhit/gocron
Golang - How to execute function at specific times
Golang: Implementing a cron / executing tasks at a specific time