From Guy Martin via https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6998 :

This add support for the very simple DVB Time and Date Table (TDT) as
defined in ESTI EN 300 468.

svn path=/trunk/; revision=41765

AUTHORS

@@ -3412,6 +3412,7 @@ Guy Martin		<gmsoft [AT] tuxicoman.be> {
 	DVB Event Information Table (EIT) dissector
 	DVB Network Information Table (NIT) dissector
 	DVB Service Description Table (SDT) dissector
+	DVB Time and Date Table (TDT) dissector
 	MPEG2 Conditional Access Table (CA) dissector
 	MPEG2 descriptors dissector
 	MPEG2 Program Associate Table (PAT) dissector

epan/CMakeLists.txt

@@ -536,6 +536,7 @@ set(DISSECTOR_SRC
 	dissectors/packet-dvb-ipdc.c
 	dissectors/packet-dvb-nit.c
 	dissectors/packet-dvb-sdt.c
+	dissectors/packet-dvb-tdt.c
 	dissectors/packet-dvbci.c
 	dissectors/packet-dvmrp.c
 	dissectors/packet-e100.c

epan/dissectors/Makefile.common

@@ -454,6 +454,7 @@ DISSECTOR_SRC = \
 	packet-dvb-ipdc.c	\
 	packet-dvb-nit.c	\
 	packet-dvb-sdt.c	\
+	packet-dvb-tdt.c	\
 	packet-dvbci.c		\
 	packet-dvmrp.c		\
 	packet-e100.c		\

epan/dissectors/packet-dvb-tdt.c

@@ -0,0 +1,103 @@
+/* packet-dvb-tdt.c
+ * Routines for DVB (ETSI EN 300 468) Time and Date Table (TDT) dissection
+ * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; tdther version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+
+#include <epan/packet.h>
+#include <epan/dissectors/packet-mpeg-sect.h>
+
+static int proto_dvb_tdt = -1;
+static int hf_dvb_tdt_utc_time = -1;
+
+static gint ett_dvb_tdt = -1;
+
+#define DVB_TDT_TID	0x70
+
+static void
+dissect_dvb_tdt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+
+	guint offset = 0;
+
+	proto_item *ti = NULL;
+	proto_tree *dvb_tdt_tree = NULL;
+
+	nstime_t utc_time;
+
+	col_clear(pinfo->cinfo, COL_INFO);
+	col_set_str(pinfo->cinfo, COL_INFO, "Time and Date Table (TDT)");
+
+	if (!tree)
+		return;
+
+	ti = proto_tree_add_item(tree, proto_dvb_tdt, tvb, offset, -1, ENC_NA);
+	dvb_tdt_tree = proto_item_add_subtree(ti, ett_dvb_tdt);
+
+	offset += packet_mpeg_sect_header(tvb, offset, dvb_tdt_tree, NULL, NULL);
+
+	if (packet_mpeg_sect_mjd_to_utc_time(tvb, offset, &utc_time) < 0) {
+		proto_tree_add_text(dvb_tdt_tree, tvb, offset, 5, "Unparseable time");
+	} else {
+		proto_tree_add_time_format(dvb_tdt_tree, hf_dvb_tdt_utc_time, tvb, offset, 5, &utc_time, "UTC Time : %s UTC", abs_time_to_str(&utc_time, ABSOLUTE_TIME_UTC, FALSE));
+	}
+}
+
+
+void
+proto_register_dvb_tdt(void)
+{
+
+	static hf_register_info hf[] = {
+
+		{ &hf_dvb_tdt_utc_time, {
+			"UTC Time", "dvb_tdt.utc_time",
+			FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0, NULL, HFILL
+		} }
+	};
+
+	static gint *ett[] = {
+		&ett_dvb_tdt
+	};
+
+	proto_dvb_tdt = proto_register_protocol("DVB Time and Date Table", "DVB TDT", "dvb_tdt");
+
+	proto_register_field_array(proto_dvb_tdt, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+}
+
+
+void proto_reg_handoff_dvb_tdt(void)
+{
+	dissector_handle_t dvb_tdt_handle;
+
+	dvb_tdt_handle = create_dissector_handle(dissect_dvb_tdt, proto_dvb_tdt);
+
+	dissector_add_uint("mpeg_sect.tid", DVB_TDT_TID, dvb_tdt_handle);
+}