How to compare time correctly in Go

goodtimes.go

package main

import (
	"fmt"
	"time"
)

func main() {
	t0 := time.Now()
	t1 := t0
	t2, _ := time.Parse(time.RFC3339, t0.Format(time.RFC3339))
	
	fmt.Println("incorrect (ignores monotonic clock)")
	
	for i, t := range []time.Time{t0, t1, t2} {
		fmt.Printf("t0(%v), t%d(%v), equal=%v\n", t0, i, t, t0 == t)
	}
	
	fmt.Println("correct (truncated monotonic clock)")

	for i, t := range []time.Time{t0, t1, t2} {
		t0 := t0.Round(0)
		t = t0.Round(0)
		fmt.Printf("t0(%v), t%d(%v), equal=%v\n", t0, i, t, t0 == t)
	}
	
	fmt.Println("correct (truncated second)")
	
	for i, t := range []time.Time{t0, t1, t2} {
		t0 := t0.Round(time.Second)
		t = t.Add(time.Millisecond)
		t = t0.Round(time.Second)
		fmt.Printf("t0(%v), t%d(%v), equal=%v\n", t0, i, t, t0 == t)
	}
}