diff --git a/examples/Makefile.am b/examples/Makefile.am
index e830769..6b70f99 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -17,6 +17,7 @@ dctool_SOURCES = \
 	dctool_parse.c \
 	dctool_read.c \
 	dctool_write.c \
+	dctool_timesync.c \
 	dctool_fwupdate.c \
 	output.h \
 	output-private.h \
diff --git a/examples/dctool.c b/examples/dctool.c
index df7fe01..f62b13c 100644
--- a/examples/dctool.c
+++ b/examples/dctool.c
@@ -63,6 +63,7 @@ static const dctool_command_t *g_commands[] = {
 	&dctool_parse,
 	&dctool_read,
 	&dctool_write,
+	&dctool_timesync,
 	&dctool_fwupdate,
 	NULL
 };
diff --git a/examples/dctool.h b/examples/dctool.h
index cc6a393..06e58a8 100644
--- a/examples/dctool.h
+++ b/examples/dctool.h
@@ -50,6 +50,7 @@ extern const dctool_command_t dctool_dump;
 extern const dctool_command_t dctool_parse;
 extern const dctool_command_t dctool_read;
 extern const dctool_command_t dctool_write;
+extern const dctool_command_t dctool_timesync;
 extern const dctool_command_t dctool_fwupdate;
 
 const dctool_command_t *
diff --git a/examples/dctool_timesync.c b/examples/dctool_timesync.c
new file mode 100644
index 0000000..3a59af5
--- /dev/null
+++ b/examples/dctool_timesync.c
@@ -0,0 +1,162 @@
+/*
+ * libdivecomputer
+ *
+ * Copyright (C) 2017 Jef Driesen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; 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 <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#endif
+
+#include <libdivecomputer/context.h>
+#include <libdivecomputer/descriptor.h>
+#include <libdivecomputer/device.h>
+
+#include "dctool.h"
+#include "common.h"
+#include "utils.h"
+
+static dc_status_t
+do_timesync (dc_context_t *context, dc_descriptor_t *descriptor, const char *devname, const dc_datetime_t *datetime)
+{
+	dc_status_t rc = DC_STATUS_SUCCESS;
+	dc_device_t *device = NULL;
+
+	// Open the device.
+	message ("Opening the device (%s %s, %s).\n",
+		dc_descriptor_get_vendor (descriptor),
+		dc_descriptor_get_product (descriptor),
+		devname ? devname : "null");
+	rc = dc_device_open (&device, context, descriptor, devname);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR ("Error opening the device.");
+		goto cleanup;
+	}
+
+	// Register the event handler.
+	message ("Registering the event handler.\n");
+	int events = DC_EVENT_WAITING | DC_EVENT_PROGRESS | DC_EVENT_DEVINFO | DC_EVENT_CLOCK | DC_EVENT_VENDOR;
+	rc = dc_device_set_events (device, events, dctool_event_cb, NULL);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR ("Error registering the event handler.");
+		goto cleanup;
+	}
+
+	// Register the cancellation handler.
+	message ("Registering the cancellation handler.\n");
+	rc = dc_device_set_cancel (device, dctool_cancel_cb, NULL);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR ("Error registering the cancellation handler.");
+		goto cleanup;
+	}
+
+	// Syncronize the device clock.
+	message ("Syncronize the device clock.\n");
+	rc = dc_device_timesync (device, datetime);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR ("Error syncronizing the device clock.");
+		goto cleanup;
+	}
+
+cleanup:
+	dc_device_close (device);
+	return rc;
+}
+
+static int
+dctool_timesync_run (int argc, char *argv[], dc_context_t *context, dc_descriptor_t *descriptor)
+{
+	int exitcode = EXIT_SUCCESS;
+	dc_status_t status = DC_STATUS_SUCCESS;
+
+	// Default option values.
+	unsigned int help = 0;
+
+	// Parse the command-line options.
+	int opt = 0;
+	const char *optstring = "h";
+#ifdef HAVE_GETOPT_LONG
+	struct option options[] = {
+		{"help",        no_argument,       0, 'h'},
+		{0,             0,                 0,  0 }
+	};
+	while ((opt = getopt_long (argc, argv, optstring, options, NULL)) != -1) {
+#else
+	while ((opt = getopt (argc, argv, optstring)) != -1) {
+#endif
+		switch (opt) {
+		case 'h':
+			help = 1;
+			break;
+		default:
+			return EXIT_FAILURE;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	// Show help message.
+	if (help) {
+		dctool_command_showhelp (&dctool_timesync);
+		return EXIT_SUCCESS;
+	}
+
+	// Get the system time.
+	dc_datetime_t datetime = {0};
+	dc_ticks_t now = dc_datetime_now ();
+	if (!dc_datetime_localtime(&datetime, now)) {
+		message ("ERROR: Failed to get the system time.\n");
+		exitcode = EXIT_FAILURE;
+		goto cleanup;
+	}
+
+	// Synchronize the device clock.
+	status = do_timesync (context, descriptor, argv[0], &datetime);
+	if (status != DC_STATUS_SUCCESS) {
+		message ("ERROR: %s\n", dctool_errmsg (status));
+		exitcode = EXIT_FAILURE;
+		goto cleanup;
+	}
+
+cleanup:
+	return exitcode;
+}
+
+const dctool_command_t dctool_timesync = {
+	dctool_timesync_run,
+	DCTOOL_CONFIG_DESCRIPTOR,
+	"timesync",
+	"Synchronize the device clock",
+	"Usage:\n"
+	"   dctool timesync [options]\n"
+	"\n"
+	"Options:\n"
+#ifdef HAVE_GETOPT_LONG
+	"   -h, --help   Show help message\n"
+#else
+	"   -h   Show help message\n"
+#endif
+};
diff --git a/include/libdivecomputer/device.h b/include/libdivecomputer/device.h
index 1990926..f6d415c 100644
--- a/include/libdivecomputer/device.h
+++ b/include/libdivecomputer/device.h
@@ -96,6 +96,9 @@ dc_device_dump (dc_device_t *device, dc_buffer_t *buffer);
 dc_status_t
 dc_device_foreach (dc_device_t *device, dc_dive_callback_t callback, void *userdata);
 
+dc_status_t
+dc_device_timesync (dc_device_t *device, const dc_datetime_t *datetime);
+
 dc_status_t
 dc_device_close (dc_device_t *device);
 
diff --git a/include/libdivecomputer/hw_frog.h b/include/libdivecomputer/hw_frog.h
index 67f624f..0af10ca 100644
--- a/include/libdivecomputer/hw_frog.h
+++ b/include/libdivecomputer/hw_frog.h
@@ -36,9 +36,6 @@ extern "C" {
 dc_status_t
 hw_frog_device_version (dc_device_t *device, unsigned char data[], unsigned int size);
 
-dc_status_t
-hw_frog_device_clock (dc_device_t *device, const dc_datetime_t *datetime);
-
 dc_status_t
 hw_frog_device_display (dc_device_t *device, const char *text);
 
diff --git a/include/libdivecomputer/hw_ostc.h b/include/libdivecomputer/hw_ostc.h
index b68e083..b7daca7 100644
--- a/include/libdivecomputer/hw_ostc.h
+++ b/include/libdivecomputer/hw_ostc.h
@@ -43,9 +43,6 @@ typedef enum hw_ostc_format_t {
 dc_status_t
 hw_ostc_device_md2hash (dc_device_t *device, unsigned char data[], unsigned int size);
 
-dc_status_t
-hw_ostc_device_clock (dc_device_t *device, const dc_datetime_t *datetime);
-
 dc_status_t
 hw_ostc_device_eeprom_read (dc_device_t *device, unsigned int bank, unsigned char data[], unsigned int size);
 
diff --git a/include/libdivecomputer/hw_ostc3.h b/include/libdivecomputer/hw_ostc3.h
index bd0d2ed..c69dd93 100644
--- a/include/libdivecomputer/hw_ostc3.h
+++ b/include/libdivecomputer/hw_ostc3.h
@@ -39,9 +39,6 @@ hw_ostc3_device_version (dc_device_t *device, unsigned char data[], unsigned int
 dc_status_t
 hw_ostc3_device_hardware (dc_device_t *device, unsigned char data[], unsigned int size);
 
-dc_status_t
-hw_ostc3_device_clock (dc_device_t *device, const dc_datetime_t *datetime);
-
 dc_status_t
 hw_ostc3_device_display (dc_device_t *device, const char *text);
 
diff --git a/src/atomics_cobalt.c b/src/atomics_cobalt.c
index 91a6da6..7c7dccb 100644
--- a/src/atomics_cobalt.c
+++ b/src/atomics_cobalt.c
@@ -75,6 +75,7 @@ static const dc_device_vtable_t atomics_cobalt_device_vtable = {
 	NULL, /* write */
 	NULL, /* dump */
 	atomics_cobalt_device_foreach, /* foreach */
+	NULL, /* timesync */
 	atomics_cobalt_device_close /* close */
 };
 
diff --git a/src/citizen_aqualand.c b/src/citizen_aqualand.c
index 5e111da..47ba87f 100644
--- a/src/citizen_aqualand.c
+++ b/src/citizen_aqualand.c
@@ -51,6 +51,7 @@ static const dc_device_vtable_t citizen_aqualand_device_vtable = {
 	NULL, /* write */
 	citizen_aqualand_device_dump, /* dump */
 	citizen_aqualand_device_foreach, /* foreach */
+	NULL, /* timesync */
 	citizen_aqualand_device_close /* close */
 };
 
diff --git a/src/cochran_commander.c b/src/cochran_commander.c
index 16707bf..b515909 100644
--- a/src/cochran_commander.c
+++ b/src/cochran_commander.c
@@ -114,6 +114,7 @@ static const dc_device_vtable_t cochran_commander_device_vtable = {
 	NULL, /* write */
 	cochran_commander_device_dump, /* dump */
 	cochran_commander_device_foreach, /* foreach */
+	NULL, /* timesync */
 	cochran_commander_device_close /* close */
 };
 
diff --git a/src/cressi_edy.c b/src/cressi_edy.c
index 226f32f..68e13fc 100644
--- a/src/cressi_edy.c
+++ b/src/cressi_edy.c
@@ -75,6 +75,7 @@ static const dc_device_vtable_t cressi_edy_device_vtable = {
 	NULL, /* write */
 	cressi_edy_device_dump, /* dump */
 	cressi_edy_device_foreach, /* foreach */
+	NULL, /* timesync */
 	cressi_edy_device_close /* close */
 };
 
diff --git a/src/cressi_leonardo.c b/src/cressi_leonardo.c
index c354b22..f21a223 100644
--- a/src/cressi_leonardo.c
+++ b/src/cressi_leonardo.c
@@ -67,6 +67,7 @@ static const dc_device_vtable_t cressi_leonardo_device_vtable = {
 	NULL, /* write */
 	cressi_leonardo_device_dump, /* dump */
 	cressi_leonardo_device_foreach, /* foreach */
+	NULL, /* timesync */
 	cressi_leonardo_device_close /* close */
 };
 
diff --git a/src/device-private.h b/src/device-private.h
index dcf0b96..7ca6610 100644
--- a/src/device-private.h
+++ b/src/device-private.h
@@ -71,6 +71,8 @@ struct dc_device_vtable_t {
 
 	dc_status_t (*foreach) (dc_device_t *device, dc_dive_callback_t callback, void *userdata);
 
+	dc_status_t (*timesync) (dc_device_t *device, const dc_datetime_t *datetime);
+
 	dc_status_t (*close) (dc_device_t *device);
 };
 
diff --git a/src/device.c b/src/device.c
index 9dcc528..6277c90 100644
--- a/src/device.c
+++ b/src/device.c
@@ -370,6 +370,19 @@ dc_device_foreach (dc_device_t *device, dc_dive_callback_t callback, void *userd
 }
 
 
+dc_status_t
+dc_device_timesync (dc_device_t *device, const dc_datetime_t *datetime)
+{
+	if (device == NULL)
+		return DC_STATUS_UNSUPPORTED;
+
+	if (device->vtable->timesync == NULL)
+		return DC_STATUS_UNSUPPORTED;
+
+	return device->vtable->timesync (device, datetime);
+}
+
+
 dc_status_t
 dc_device_close (dc_device_t *device)
 {
diff --git a/src/diverite_nitekq.c b/src/diverite_nitekq.c
index 205115a..8c8c442 100644
--- a/src/diverite_nitekq.c
+++ b/src/diverite_nitekq.c
@@ -69,6 +69,7 @@ static const dc_device_vtable_t diverite_nitekq_device_vtable = {
 	NULL, /* write */
 	diverite_nitekq_device_dump, /* dump */
 	diverite_nitekq_device_foreach, /* foreach */
+	NULL, /* timesync */
 	diverite_nitekq_device_close /* close */
 };
 
diff --git a/src/divesystem_idive.c b/src/divesystem_idive.c
index d26e2b4..8a8f1ae 100644
--- a/src/divesystem_idive.c
+++ b/src/divesystem_idive.c
@@ -86,6 +86,7 @@ static const dc_device_vtable_t divesystem_idive_device_vtable = {
 	NULL, /* write */
 	NULL, /* dump */
 	divesystem_idive_device_foreach, /* foreach */
+	NULL, /* timesync */
 	divesystem_idive_device_close /* close */
 };
 
diff --git a/src/hw_frog.c b/src/hw_frog.c
index d8b89ca..83ee998 100644
--- a/src/hw_frog.c
+++ b/src/hw_frog.c
@@ -61,6 +61,7 @@ typedef struct hw_frog_device_t {
 
 static dc_status_t hw_frog_device_set_fingerprint (dc_device_t *abstract, const unsigned char data[], unsigned int size);
 static dc_status_t hw_frog_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, void *userdata);
+static dc_status_t hw_frog_device_timesync (dc_device_t *abstract, const dc_datetime_t *datetime);
 static dc_status_t hw_frog_device_close (dc_device_t *abstract);
 
 static const dc_device_vtable_t hw_frog_device_vtable = {
@@ -71,6 +72,7 @@ static const dc_device_vtable_t hw_frog_device_vtable = {
 	NULL, /* write */
 	NULL, /* dump */
 	hw_frog_device_foreach, /* foreach */
+	hw_frog_device_timesync, /* timesync */
 	hw_frog_device_close /* close */
 };
 
@@ -482,14 +484,11 @@ hw_frog_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, void
 }
 
 
-dc_status_t
-hw_frog_device_clock (dc_device_t *abstract, const dc_datetime_t *datetime)
+static dc_status_t
+hw_frog_device_timesync (dc_device_t *abstract, const dc_datetime_t *datetime)
 {
 	hw_frog_device_t *device = (hw_frog_device_t *) abstract;
 
-	if (!ISINSTANCE (abstract))
-		return DC_STATUS_INVALIDARGS;
-
 	if (datetime == NULL) {
 		ERROR (abstract->context, "Invalid parameter specified.");
 		return DC_STATUS_INVALIDARGS;
diff --git a/src/hw_ostc.c b/src/hw_ostc.c
index 3f46603..87c2b1d 100644
--- a/src/hw_ostc.c
+++ b/src/hw_ostc.c
@@ -70,6 +70,7 @@ typedef struct hw_ostc_firmware_t {
 static dc_status_t hw_ostc_device_set_fingerprint (dc_device_t *abstract, const unsigned char data[], unsigned int size);
 static dc_status_t hw_ostc_device_dump (dc_device_t *abstract, dc_buffer_t *buffer);
 static dc_status_t hw_ostc_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, void *userdata);
+static dc_status_t hw_ostc_device_timesync (dc_device_t *abstract, const dc_datetime_t *datetime);
 static dc_status_t hw_ostc_device_close (dc_device_t *abstract);
 
 static const dc_device_vtable_t hw_ostc_device_vtable = {
@@ -80,6 +81,7 @@ static const dc_device_vtable_t hw_ostc_device_vtable = {
 	NULL, /* write */
 	hw_ostc_device_dump, /* dump */
 	hw_ostc_device_foreach, /* foreach */
+	hw_ostc_device_timesync, /* timesync */
 	hw_ostc_device_close /* close */
 };
 
@@ -377,15 +379,12 @@ hw_ostc_device_md2hash (dc_device_t *abstract, unsigned char data[], unsigned in
 }
 
 
-dc_status_t
-hw_ostc_device_clock (dc_device_t *abstract, const dc_datetime_t *datetime)
+static dc_status_t
+hw_ostc_device_timesync (dc_device_t *abstract, const dc_datetime_t *datetime)
 {
 	dc_status_t status = DC_STATUS_SUCCESS;
 	hw_ostc_device_t *device = (hw_ostc_device_t *) abstract;
 
-	if (!ISINSTANCE (abstract))
-		return DC_STATUS_INVALIDARGS;
-
 	if (datetime == NULL) {
 		ERROR (abstract->context, "Invalid parameter specified.");
 		return DC_STATUS_INVALIDARGS;
diff --git a/src/hw_ostc3.c b/src/hw_ostc3.c
index e7b7d9e..a1a5efd 100644
--- a/src/hw_ostc3.c
+++ b/src/hw_ostc3.c
@@ -129,6 +129,7 @@ static dc_status_t hw_ostc3_device_read (dc_device_t *abstract, unsigned int add
 static dc_status_t hw_ostc3_device_write (dc_device_t *abstract, unsigned int address, const unsigned char data[], unsigned int size);
 static dc_status_t hw_ostc3_device_dump (dc_device_t *abstract, dc_buffer_t *buffer);
 static dc_status_t hw_ostc3_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, void *userdata);
+static dc_status_t hw_ostc3_device_timesync (dc_device_t *abstract, const dc_datetime_t *datetime);
 static dc_status_t hw_ostc3_device_close (dc_device_t *abstract);
 
 static const dc_device_vtable_t hw_ostc3_device_vtable = {
@@ -139,6 +140,7 @@ static const dc_device_vtable_t hw_ostc3_device_vtable = {
 	hw_ostc3_device_write, /* write */
 	hw_ostc3_device_dump, /* dump */
 	hw_ostc3_device_foreach, /* foreach */
+	hw_ostc3_device_timesync, /* timesync */
 	hw_ostc3_device_close /* close */
 };
 
@@ -801,14 +803,11 @@ hw_ostc3_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, voi
 }
 
 
-dc_status_t
-hw_ostc3_device_clock (dc_device_t *abstract, const dc_datetime_t *datetime)
+static dc_status_t
+hw_ostc3_device_timesync (dc_device_t *abstract, const dc_datetime_t *datetime)
 {
 	hw_ostc3_device_t *device = (hw_ostc3_device_t *) abstract;
 
-	if (!ISINSTANCE (abstract))
-		return DC_STATUS_INVALIDARGS;
-
 	if (datetime == NULL) {
 		ERROR (abstract->context, "Invalid parameter specified.");
 		return DC_STATUS_INVALIDARGS;
diff --git a/src/libdivecomputer.symbols b/src/libdivecomputer.symbols
index c3d372b..3b16700 100644
--- a/src/libdivecomputer.symbols
+++ b/src/libdivecomputer.symbols
@@ -56,6 +56,7 @@ dc_device_read
 dc_device_set_cancel
 dc_device_set_events
 dc_device_set_fingerprint
+dc_device_timesync
 dc_device_write
 
 oceanic_atom2_device_version
@@ -79,19 +80,16 @@ suunto_eon_device_write_name
 suunto_vyper2_device_version
 suunto_vyper2_device_reset_maxdepth
 hw_ostc_device_md2hash
-hw_ostc_device_clock
 hw_ostc_device_eeprom_read
 hw_ostc_device_eeprom_write
 hw_ostc_device_reset
 hw_ostc_device_screenshot
 hw_ostc_device_fwupdate
 hw_frog_device_version
-hw_frog_device_clock
 hw_frog_device_display
 hw_frog_device_customtext
 hw_ostc3_device_version
 hw_ostc3_device_hardware
-hw_ostc3_device_clock
 hw_ostc3_device_display
 hw_ostc3_device_customtext
 hw_ostc3_device_config_read
diff --git a/src/mares_darwin.c b/src/mares_darwin.c
index 9ac56ba..4b1bc24 100644
--- a/src/mares_darwin.c
+++ b/src/mares_darwin.c
@@ -70,6 +70,7 @@ static const dc_device_vtable_t mares_darwin_device_vtable = {
 	NULL, /* write */
 	mares_darwin_device_dump, /* dump */
 	mares_darwin_device_foreach, /* foreach */
+	NULL, /* timesync */
 	mares_darwin_device_close /* close */
 };
 
diff --git a/src/mares_iconhd.c b/src/mares_iconhd.c
index 3a73968..e945e9f 100644
--- a/src/mares_iconhd.c
+++ b/src/mares_iconhd.c
@@ -87,6 +87,7 @@ static const dc_device_vtable_t mares_iconhd_device_vtable = {
 	NULL, /* write */
 	mares_iconhd_device_dump, /* dump */
 	mares_iconhd_device_foreach, /* foreach */
+	NULL, /* timesync */
 	mares_iconhd_device_close /* close */
 };
 
diff --git a/src/mares_nemo.c b/src/mares_nemo.c
index 2ec3588..c73c24b 100644
--- a/src/mares_nemo.c
+++ b/src/mares_nemo.c
@@ -62,6 +62,7 @@ static const dc_device_vtable_t mares_nemo_device_vtable = {
 	NULL, /* write */
 	mares_nemo_device_dump, /* dump */
 	mares_nemo_device_foreach, /* foreach */
+	NULL, /* timesync */
 	mares_nemo_device_close /* close */
 };
 
diff --git a/src/mares_puck.c b/src/mares_puck.c
index fc8e00d..b220f54 100644
--- a/src/mares_puck.c
+++ b/src/mares_puck.c
@@ -57,6 +57,7 @@ static const dc_device_vtable_t mares_puck_device_vtable = {
 	NULL, /* write */
 	mares_puck_device_dump, /* dump */
 	mares_puck_device_foreach, /* foreach */
+	NULL, /* timesync */
 	mares_puck_device_close /* close */
 };
 
diff --git a/src/oceanic_atom2.c b/src/oceanic_atom2.c
index d9e8d5a..bae6537 100644
--- a/src/oceanic_atom2.c
+++ b/src/oceanic_atom2.c
@@ -74,6 +74,7 @@ static const oceanic_common_device_vtable_t oceanic_atom2_device_vtable = {
 		oceanic_atom2_device_write, /* write */
 		oceanic_common_device_dump, /* dump */
 		oceanic_common_device_foreach, /* foreach */
+		NULL, /* timesync */
 		oceanic_atom2_device_close /* close */
 	},
 	oceanic_common_device_logbook,
diff --git a/src/oceanic_veo250.c b/src/oceanic_veo250.c
index d47c532..b6021dd 100644
--- a/src/oceanic_veo250.c
+++ b/src/oceanic_veo250.c
@@ -56,6 +56,7 @@ static const oceanic_common_device_vtable_t oceanic_veo250_device_vtable = {
 		NULL, /* write */
 		oceanic_common_device_dump, /* dump */
 		oceanic_common_device_foreach, /* foreach */
+		NULL, /* timesync */
 		oceanic_veo250_device_close /* close */
 	},
 	oceanic_common_device_logbook,
diff --git a/src/oceanic_vtpro.c b/src/oceanic_vtpro.c
index 2e86f5f..cc09892 100644
--- a/src/oceanic_vtpro.c
+++ b/src/oceanic_vtpro.c
@@ -68,6 +68,7 @@ static const oceanic_common_device_vtable_t oceanic_vtpro_device_vtable = {
 		NULL, /* write */
 		oceanic_common_device_dump, /* dump */
 		oceanic_common_device_foreach, /* foreach */
+		NULL, /* timesync */
 		oceanic_vtpro_device_close /* close */
 	},
 	oceanic_vtpro_device_logbook,
diff --git a/src/reefnet_sensus.c b/src/reefnet_sensus.c
index 94d7a7e..37c343a 100644
--- a/src/reefnet_sensus.c
+++ b/src/reefnet_sensus.c
@@ -57,6 +57,7 @@ static const dc_device_vtable_t reefnet_sensus_device_vtable = {
 	NULL, /* write */
 	reefnet_sensus_device_dump, /* dump */
 	reefnet_sensus_device_foreach, /* foreach */
+	NULL, /* timesync */
 	reefnet_sensus_device_close /* close */
 };
 
diff --git a/src/reefnet_sensuspro.c b/src/reefnet_sensuspro.c
index bf88801..4df3c07 100644
--- a/src/reefnet_sensuspro.c
+++ b/src/reefnet_sensuspro.c
@@ -56,6 +56,7 @@ static const dc_device_vtable_t reefnet_sensuspro_device_vtable = {
 	NULL, /* write */
 	reefnet_sensuspro_device_dump, /* dump */
 	reefnet_sensuspro_device_foreach, /* foreach */
+	NULL, /* timesync */
 	reefnet_sensuspro_device_close /* close */
 };
 
diff --git a/src/reefnet_sensusultra.c b/src/reefnet_sensusultra.c
index f28dbb2..fba7511 100644
--- a/src/reefnet_sensusultra.c
+++ b/src/reefnet_sensusultra.c
@@ -65,6 +65,7 @@ static const dc_device_vtable_t reefnet_sensusultra_device_vtable = {
 	NULL, /* write */
 	reefnet_sensusultra_device_dump, /* dump */
 	reefnet_sensusultra_device_foreach, /* foreach */
+	NULL, /* timesync */
 	reefnet_sensusultra_device_close /* close */
 };
 
diff --git a/src/shearwater_petrel.c b/src/shearwater_petrel.c
index 4966d14..71f507e 100644
--- a/src/shearwater_petrel.c
+++ b/src/shearwater_petrel.c
@@ -56,6 +56,7 @@ static const dc_device_vtable_t shearwater_petrel_device_vtable = {
 	NULL, /* write */
 	NULL, /* dump */
 	shearwater_petrel_device_foreach, /* foreach */
+	NULL, /* timesync */
 	shearwater_petrel_device_close /* close */
 };
 
diff --git a/src/shearwater_predator.c b/src/shearwater_predator.c
index 0e7a0d3..42a579b 100644
--- a/src/shearwater_predator.c
+++ b/src/shearwater_predator.c
@@ -57,6 +57,7 @@ static const dc_device_vtable_t shearwater_predator_device_vtable = {
 	NULL, /* write */
 	shearwater_predator_device_dump, /* dump */
 	shearwater_predator_device_foreach, /* foreach */
+	NULL, /* timesync */
 	shearwater_predator_device_close /* close */
 };
 
diff --git a/src/suunto_d9.c b/src/suunto_d9.c
index 2908792..56f8c40 100644
--- a/src/suunto_d9.c
+++ b/src/suunto_d9.c
@@ -58,6 +58,7 @@ static const suunto_common2_device_vtable_t suunto_d9_device_vtable = {
 		suunto_common2_device_write, /* write */
 		suunto_common2_device_dump, /* dump */
 		suunto_common2_device_foreach, /* foreach */
+		NULL, /* timesync */
 		suunto_d9_device_close /* close */
 	},
 	suunto_d9_device_packet
diff --git a/src/suunto_eon.c b/src/suunto_eon.c
index ce9ce83..2875654 100644
--- a/src/suunto_eon.c
+++ b/src/suunto_eon.c
@@ -51,6 +51,7 @@ static const dc_device_vtable_t suunto_eon_device_vtable = {
 	NULL, /* write */
 	suunto_eon_device_dump, /* dump */
 	suunto_eon_device_foreach, /* foreach */
+	NULL, /* timesync */
 	suunto_eon_device_close /* close */
 };
 
diff --git a/src/suunto_eonsteel.c b/src/suunto_eonsteel.c
index 615f5c7..2e6d4c4 100644
--- a/src/suunto_eonsteel.c
+++ b/src/suunto_eonsteel.c
@@ -81,6 +81,7 @@ static const dc_device_vtable_t suunto_eonsteel_device_vtable = {
 	NULL, /* write */
 	NULL, /* dump */
 	suunto_eonsteel_device_foreach, /* foreach */
+	NULL, /* timesync */
 	suunto_eonsteel_device_close /* close */
 };
 
diff --git a/src/suunto_solution.c b/src/suunto_solution.c
index c708114..cb2481d 100644
--- a/src/suunto_solution.c
+++ b/src/suunto_solution.c
@@ -54,6 +54,7 @@ static const dc_device_vtable_t suunto_solution_device_vtable = {
 	NULL, /* write */
 	suunto_solution_device_dump, /* dump */
 	suunto_solution_device_foreach, /* foreach */
+	NULL, /* timesync */
 	suunto_solution_device_close /* close */
 };
 
diff --git a/src/suunto_vyper.c b/src/suunto_vyper.c
index ce44e05..33657dc 100644
--- a/src/suunto_vyper.c
+++ b/src/suunto_vyper.c
@@ -63,6 +63,7 @@ static const dc_device_vtable_t suunto_vyper_device_vtable = {
 	suunto_vyper_device_write, /* write */
 	suunto_vyper_device_dump, /* dump */
 	suunto_vyper_device_foreach, /* foreach */
+	NULL, /* timesync */
 	suunto_vyper_device_close /* close */
 };
 
diff --git a/src/suunto_vyper2.c b/src/suunto_vyper2.c
index 8ab521e..618ee4a 100644
--- a/src/suunto_vyper2.c
+++ b/src/suunto_vyper2.c
@@ -50,6 +50,7 @@ static const suunto_common2_device_vtable_t suunto_vyper2_device_vtable = {
 		suunto_common2_device_write, /* write */
 		suunto_common2_device_dump, /* dump */
 		suunto_common2_device_foreach, /* foreach */
+		NULL, /* timesync */
 		suunto_vyper2_device_close /* close */
 	},
 	suunto_vyper2_device_packet
diff --git a/src/uwatec_aladin.c b/src/uwatec_aladin.c
index d70369a..25c9208 100644
--- a/src/uwatec_aladin.c
+++ b/src/uwatec_aladin.c
@@ -62,6 +62,7 @@ static const dc_device_vtable_t uwatec_aladin_device_vtable = {
 	NULL, /* write */
 	uwatec_aladin_device_dump, /* dump */
 	uwatec_aladin_device_foreach, /* foreach */
+	NULL, /* timesync */
 	uwatec_aladin_device_close /* close */
 };
 
diff --git a/src/uwatec_g2.c b/src/uwatec_g2.c
index fc32aff..6e35104 100644
--- a/src/uwatec_g2.c
+++ b/src/uwatec_g2.c
@@ -54,6 +54,7 @@ static const dc_device_vtable_t uwatec_g2_device_vtable = {
 	NULL, /* write */
 	uwatec_g2_device_dump, /* dump */
 	uwatec_g2_device_foreach, /* foreach */
+	NULL, /* timesync */
 	uwatec_g2_device_close /* close */
 };
 
diff --git a/src/uwatec_memomouse.c b/src/uwatec_memomouse.c
index b23c6b2..2f93067 100644
--- a/src/uwatec_memomouse.c
+++ b/src/uwatec_memomouse.c
@@ -58,6 +58,7 @@ static const dc_device_vtable_t uwatec_memomouse_device_vtable = {
 	NULL, /* write */
 	uwatec_memomouse_device_dump, /* dump */
 	uwatec_memomouse_device_foreach, /* foreach */
+	NULL, /* timesync */
 	uwatec_memomouse_device_close /* close */
 };
 
diff --git a/src/uwatec_meridian.c b/src/uwatec_meridian.c
index d59b855..c32f3bc 100644
--- a/src/uwatec_meridian.c
+++ b/src/uwatec_meridian.c
@@ -56,6 +56,7 @@ static const dc_device_vtable_t uwatec_meridian_device_vtable = {
 	NULL, /* write */
 	uwatec_meridian_device_dump, /* dump */
 	uwatec_meridian_device_foreach, /* foreach */
+	NULL, /* timesync */
 	uwatec_meridian_device_close /* close */
 };
 
diff --git a/src/uwatec_smart.c b/src/uwatec_smart.c
index 425e76e..4fd2e2d 100644
--- a/src/uwatec_smart.c
+++ b/src/uwatec_smart.c
@@ -52,6 +52,7 @@ static const dc_device_vtable_t uwatec_smart_device_vtable = {
 	NULL, /* write */
 	uwatec_smart_device_dump, /* dump */
 	uwatec_smart_device_foreach, /* foreach */
+	NULL, /* timesync */
 	uwatec_smart_device_close /* close */
 };
 
diff --git a/src/zeagle_n2ition3.c b/src/zeagle_n2ition3.c
index fed6ae2..3d2bb24 100644
--- a/src/zeagle_n2ition3.c
+++ b/src/zeagle_n2ition3.c
@@ -64,6 +64,7 @@ static const dc_device_vtable_t zeagle_n2ition3_device_vtable = {
 	NULL, /* write */
 	zeagle_n2ition3_device_dump, /* dump */
 	zeagle_n2ition3_device_foreach, /* foreach */
+	NULL, /* timesync */
 	zeagle_n2ition3_device_close /* close */
 };