[Nmh-workers] The zone field of Date-Time components

As I read, RFC822, Section 5.1, the zone filed field of Date components, is 
required. Do I misread it?  I have encountered one Email, for which it is 
missing. It there a de defacto standard which makes it optional?

    Norman Shapiro
    798 Barron Avenue
    Palo Alto CA 94306-3109
    (650) 565-8215
    norm(_at_)dad(_dot_)org

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