see http://bugs.mutt.org/3263, this patch adds time/date to
the entries in .muttdebug so it will be easier to correlate them
to external events logged in tcpdump streams or logfiles

--- a/init.c
+++ b/init.c
@@ -2846,8 +2846,8 @@
   {
     t = time (0);
     setbuf (debugfile, NULL); /* don't buffer the debugging output! */
-    fprintf (debugfile, "Mutt %s started at %s.\nDebugging at level %d.\n\n",
-	     MUTT_VERSION, asctime (localtime (&t)), debuglevel);
+    dprint(1,(debugfile,"Mutt/%s (%s) debugging at level %d\n",
+	      MUTT_VERSION, ReleaseDate, debuglevel));
   }
 }
 #endif
--- a/lib.c
+++ b/lib.c
@@ -1007,6 +1007,24 @@
   return sysexits_h[i].str;
 }
 
+void mutt_debug (FILE *fp, const char *fmt, ...)
+{
+  va_list ap;
+  time_t now = time (NULL);
+  static char buf[23] = "";
+  static time_t last = 0;
+
+  if (now > last)
+  {
+    strftime (buf, sizeof (buf), "%Y-%m-%d %H:%M:%S", localtime (&now));
+    last = now;
+  }
+  fprintf (fp, "[%s] ", buf);
+  va_start (ap, fmt);
+  vfprintf (fp, fmt, ap);
+  va_end (ap);
+}
+
 int mutt_atos (const char *str, short *dst)
 {
   int rc;
--- a/lib.h
+++ b/lib.h
@@ -126,7 +126,9 @@
 MUTT_LIB_WHERE FILE *debugfile MUTT_LIB_INITVAL(0);
 MUTT_LIB_WHERE int debuglevel MUTT_LIB_INITVAL(0);
 
-#  define dprint(N,X) do { if(debuglevel>=N && debugfile) fprintf X; } while (0)
+void mutt_debug (FILE *, const char *, ...);
+
+#  define dprint(N,X) do { if(debuglevel>=N && debugfile) mutt_debug X; } while (0)
 
 # else