[Nmh-workers] mh-format, function %(clock {date_component}), when date_component is missing

[norm]

Experiments suggest that, at least as applied to scan, the function
%(clock {date_component}), when date_component is missing, returns the file
modification time of the message, consistent with 'sort -nocheck'. But I can't
find that documented in the man page. I expect that the other date functions
behave similarly.

    Norman Shapiro