Use correct time layout

Hi @Tomohiro 

I altered time layout at seconds.

```go
package main

import (
	"fmt"
	"time"
)

func main() {
	fmt.Println(time.Now())
	fmt.Println(time.Now().Format("20060102150406")) // before
	fmt.Println(time.Now().Format("20060102150405")) // after
}

// Output
// 2014-09-09 20:36:51.206140293 +0900 JST
// 20140909203614 // <- at the end 14 is wrong (14 is "2014")
// 20140909203651 // <- at the end 51 is correct!!
```