fix month value for acknowledge

[cdriks]

Hi,
The acknowledgeAlarm method doesn't work properly with the timestamps. I receive an error class 5 (services) and an error code 14 (invalid-time-stamp), or an error code 7 (inconsistent-parameters).

Steps to reproduce Issue (Bug Report)

If I send following acknowledge command :

client.acknowledgeAlarm('10.10.10.10', { type: 0, instance: 18 }, 2, 'BACnet', { value: new Date("2022-09-27 14:53:25.20"), type: 2 }, { value: new Date(), type: 2 }, { invokeId: 54 }, (err, value) => {
        console.log(err)
})

I can see into Wireshark following telegramm:

Building Automation and Control Network APDU\
    0000 .... = APDU Type: Confirmed-REQ (0)
    .... 0000 = PDU Flags: 0x0
    .111 .... = Max Response Segments accepted: Greater than 64 segments (7)
    .... 0101 = Size of Maximum ADPU accepted: Up to 1476 octets (fits in an ISO 8802-3 frame) (5)
    Invoke ID: 54
    Service Choice: acknowledgeAlarm (0)
    acknowledging Process Id: (Unsigned) 81001
    ObjectIdentifier: analog-input, 18
    event State Acknowledged:  offnormal (2)
    {[3]
    {[2]
    date time: 
        Date: August 27, 2022, (Day of Week = Tuesday)
        Time: 2:53:25.20 P.M. = 14:53:25.20
    }[2]
    }[3]
    acknowledgement Source: UTF-8 'BACnet'
    {[5]
    {[2]
    acknowledgement timestamp: 
        Date: August 27, 2022, (Day of Week = Tuesday)
        Time: 3:08:02.2 P.M. = 15:08:02.2
    }[2]
    }[5]

Where the timestamps are wrong : August instead of September.

If I try to "cheat", and manually change the month, the day of week is not correct anymore.

What does this Pull Request do

• Fix the value of the encoded month