Parse internal go time.Time wall

time.go

package main

import (
	"fmt"
	"time"
)

const (
	secondsPerMinute       = 60
	secondsPerHour         = 60 * secondsPerMinute
	secondsPerDay          = 24 * secondsPerHour
	nsecMask               = 1<<30 - 1
	wallToInternal   int64 = (1884*365 + 1884/4 - 1884/100 + 1884/400) * secondsPerDay
	nsecShift              = 30
	unixToInternal   int64 = (1969*365 + 1969/4 - 1969/100 + 1969/400) * secondsPerDay
	internalToUnix   int64 = -unixToInternal
)

func main() {
	loc, _ := time.LoadLocation("America/Los_Angeles")

	var wall uint64 = 13886766125597691483
	nanos := int32(wall & nsecMask)
	fmt.Println(nanos)

	secs := wallToInternal + int64(wall<<1>>(nsecShift+1))
	fmt.Println(secs + internalToUnix)

	t := time.Unix(secs+internalToUnix, int64(nanos))
	fmt.Println(t)
	fmt.Println(t.In(loc))
}