Refactor parse duration

package main

import (
    "fmt"
    "time"
    "strings"
)

func main() {
    fmt.Println("Hello World!")
    
    value  := "04/19/16, 05:47PM"
    biggerTime := "05/19/16, 11:30PM"
    // Writing down the way the standard time would look like formatted our way
    layout := "01/02/06, 03:04PM"
    t1, _ := time.Parse(layout, value)
    t2, _ := time.Parse(layout, biggerTime)
    
    duration := t2.Sub(t1)
    fmt.Println(duration)
    fmt.Println(reformatDuration(duration))
    
}

func reformatDuration(d time.Duration) string {
    stringValue := d.String()
    splitHour := strings.Split(stringValue, "h")
    var (
        hour = "0"
        minute = "0"
    )
    if len(splitHour) > 1 {
        hour = splitHour[0]
        stringValue = splitHour[1]
    }
    splitMinute := strings.Split(stringValue, "m")
    if len(splitMinute) > 1 {
        minute = splitMinute[0]
    }
    return fmt.Sprintf("%v:%v", hour, minute)
}