Time Conversion in Go

TimeConversionInGo.go

package main

import "fmt"

func main() {
	var t string

	fmt.Scan(&t)

	hr := (int(t[0])-48)*10 + (int(t[1]) - 48)
	mn := (int(t[3])-48)*10 + (int(t[4]) - 48)
	sd := (int(t[6])-48)*10 + (int(t[7]) - 48)

	pm := t[8] == 'P' || t[8] == 'p'

	if pm {
		if hr != 12 {
			hr += 12
		}
	} else {
		if hr == 12 {
			hr = 0
		}
	}

	fmt.Printf("%02d:%02d:%02d", hr, mn, sd)
}