func GenID() {
    type bondChaincode struct {
        YYMM  string
        Count int
    }

    yymm := time.Now().Format("0602")

    bondCC := bondChaincode{}
    bondCC.YYMM = yymm
    bondCC.Count = bondCC.Count + 1

    iStr := strconv.Itoa(bondCC.Count)
    for len(iStr) < 6 {
        iStr = "0" + iStr
    }
    // format YYMMxxxxxx
    fmt.Println(yymm + iStr)
}