Timer full code

main.go

package main

import (
	"fmt"
	"time"
)

// A simple timer
type Timer time.Time

// Create and start a new timer
func StartTimer() Timer {
	return Timer(time.Now())
}

// A Nanosecond time value
type Nanosecond int64

// Return the number of nanoseconds that have elapsed.
func (t Timer) ElapsedNanoseconds() Nanosecond {
	return Nanosecond(time.Now().Sub(time.Time(t)).Nanoseconds())
}

// A Millisecond time value
type Millisecond int64

// Return the number of milliseconds that have elapsed.
func (t Timer) ElapsedMilliseconds() Millisecond {
	return Millisecond(t.ElapsedNanoseconds() / 1000000)
}

// Convert Nanoseconds to Milliseconds
func (n Nanosecond) ToMilliseconds() Millisecond {
    return Millisecond(n / 1000000)
}

// Convert Milliseconds to Nanoseconds
func (m Millisecond) ToNanoseconds() Nanosecond {
    return Nanosecond(m * 1000000)
}

func main() {
	timer0 := StartTimer()
	time.Sleep(1000000000) // Sleep for one second
	shortDelay := timer0.ElapsedNanoseconds()

	timer1 := StartTimer()
	time.Sleep(2 * 1000000000) // Sleep for two seconds
	longDelay := timer1.ElapsedMilliseconds()

	if shortDelay.ToMilliseconds() > longDelay {
		fmt.Print("Something bad happened\n")
	}
	fmt.Print("Bubye!\n")
}