Version 1.2.1. Hard-code the time zone for date since some installations

don't support %Z.  Add an example for SunOS 4.

signcontrol

@@ -1,6 +1,6 @@
 #!/usr/local/bin/perl5 -w
 # written April 1996, tale@uunet.uu.net (David C Lawrence)
-# Version 1.2
+# Version 1.2.1
 
 # CONFIGURATION
 
@@ -36,7 +36,13 @@ $id_host = 'FULL_HOST_NAME';
 # how can a standards-compliant date header be generated?
 # this gets substituted into a perl backtick expression,
 # so be careful with the quoting.
-$get_date = "/usr/local/gnu/bin/date -u '+%a, %-d %h %Y %T %Z'";
+# -0000 is hardcoded here as GMT/UTC zone because in some installations 
+# the %Z flag does not work.
+$get_date = "/usr/local/gnu/bin/date -u '+%a, %-d %h %Y %T -0000'";
+
+# this expression works with SunOS 4's date; note that a formatted date string 
+# is not used because it doesn't support four digit years
+# $get_date = '/bin/date -u | /bin/awk \'{print $1 ",", $3, $2, $6, $4, $5}\'';
 
 # headers to sign.  Sender is included because non-PGP authentication uses it.
 @signheaders = ('Subject', 'Control', 'Message-ID', 'Date', 'From', 'Sender');