Formatting date within an array within a struct - date

Question

I am wanting to make sure that the DOB(Date of Birth) is formatted professionally and clearly instead of being a bland integer. I have tried using a constant to declare the layout like this
const (
layoutISO = "2006-01-02"
layoutUS = "January 2, 2006"
)
date := "1999-12-31"
t, _ := time.Parse(layoutISO, date)
fmt.Println(t) // 1999-12-31 00:00:00 +0000 UTC
fmt.Println(t.Format(layoutUS)) // December 31, 1999
but I can't seem to fit this into my context
package main
import (
"fmt"
)
func main() {
const (
layoutISO = "2006-01-02"
layoutUS = "January 2, 2006"
)
type aUser struct {
userID int
username string
email string
DOB int64
registeredAt int64
}
type note struct {
name string
status string
users []aUser
}
sally := aUser{01, "Sally", "sally#gmail.com", 112498, 1935}
john := aUser{02, "John", "johnme#gmail.com", 112388, 1978}
users := []aUser{sally, john}
notes := note{"Grocery List", "Completed", users}
fmt.Printf("notes are %v\n", notes)
}

Answer 1

You can extract year/month/date from the numeric type with division and modulo operations, then write them to a string using C-style string formatting with fmt.Sprintf().
var dob uint64 = 112498
date := fmt.Sprintf("19%02d-%02d-%02d", dob % 100, dob / 10000, (dob / 100) % 100)
fmt.Println(date) // 1998-11-24
Be warned your date format is missing century and millennium information, so in the above code I guessed that the year is 19XX (as opposed to 20XX, etc.).