You want to look at dtimep.c (the generated output from dtimep.lex).
And from the 1.4 tarball ... yes, it's in there.
I don't have one of those. From the savannah tarball:
local@riva:~/nmh-1.4% find . -name 'dtimep*' -print
./sbr/dtimep.lex
Really?
$ wget http://download.savannah.nongnu.org/releases/nmh/nmh-1.4.tar.gz
[...]
$ tar -ztvf nmh-1.4.tar.gz | grep dtimep.c
-rw-r--r-- kenh/kenh 79419 2012-01-01 11:15:52 nmh-1.4/sbr/dtimep.c
steve
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