(a) An instrument may be antedated or postdated. The date stated determines the time of payment if the instrument is payable at a fixed period after date. Except as provided in section 336.4-401(c), an instrument payable on demand is not payable before the date of the instrument.

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(b) If an instrument is undated, its date is the date of its issue or, in the case of an unissued instrument, the date it first comes into possession of a holder.