-250§ 4417. Computation of time Where the instrument is payable at a fixed period after date, after sight, or after the happening of a specified event, the time of payment is determined by excluding the day from which the time is to begin to run, and by including the date of payment. § 4418. Instrument payable at bank Where the instrument is made payable at a bank it is equivalent to an order to the bank to pay the same for the account of the principal debtor thereon. § 4419. Payment in due course defined Payment is made in due course when it is made at or after the maturity of the instrument to the holder thereof in good faith and without notice that his title is defective. Article G—Notice of Dishonor § 4421. Parties to whom notice of dishonor given Except as herein otherwise provided, when a negotiable instrument has been dishonored by nonacceptance or nonpayment, notice of dishonor must be given to the drawer and to each indorser, and any drawer or indorser to whom such notice is not given is discharged. § 4422. Parties who may give The notice may be given by or on behalf of the holder, or by or on behalf of any party to the instrument who might be compelled to pay it to the holder, and who upon taking it up would have a right to reimbursement from the party to whom the notice is given. § 4423. Notice by agent Notice of dishonor may be given by an agent either in his own name or in the name of any party entitled to give notice, whether that party be his principal or not. § 4424. Effect of notice on behalf of holder Where notice is given by or on behalf of the holder, it inures for the benefit of all subsequent holders and all prior parties who have a right of recourse against the party to whom it is given. § 4425. Effect of notice on behalf of party entitled to give notice Where notice is given by or on behalf of a party entitled to give notice, it inures for the benefit of the holder and all parties subsequent to the party to whom notice is given. § 4426. Notice by agent; authority; procedure Where the instrument has been dishonored in the hands of an agent, he may either himself give notice to the parties liable thereon or he may give notice to his principal. If he gives notice to his principal, he must do so within the same time as if he were the holder, and the principal upon the receipt of such notice has himself the same time for giving notice as if the agent had been an independent holder. § 4427. Sufficiency of notice A written notice need not be signed, and an insufficient written notice may be supplemented and validated by verbal communication. A misdescription of the instrument does not vitiate the notice unless the party to whom the notice is given is in fact misled thereby. § 4428. Form of notice The notice may be in writing or merely oral and may be given in any terms which sufficiently identify the instrument, and indicate that it has been dishonored by nonacceptance or nonpayment. I t may in all cases be given by delivering it personally or through the mails.