diff --git a/src/reefnet_sensus.c b/src/reefnet_sensus.c
index 27eb8ad..25156be 100644
--- a/src/reefnet_sensus.c
+++ b/src/reefnet_sensus.c
@@ -22,6 +22,7 @@
 #include <string.h> // memcmp, memcpy
 #include <stdlib.h> // malloc, free
 #include <assert.h> // assert
+#include <time.h>   // time
 
 #include "device-private.h"
 #include "reefnet_sensus.h"
@@ -48,6 +49,8 @@ struct reefnet_sensus_device_t {
 	struct serial *port;
 	unsigned int waiting;
 	unsigned int timestamp;
+	unsigned int devtime;
+	time_t systime;
 };
 
 static device_status_t reefnet_sensus_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size);
@@ -116,6 +119,8 @@ reefnet_sensus_device_open (device_t **out, const char* name)
 	device->port = NULL;
 	device->waiting = 0;
 	device->timestamp = 0;
+	device->systime = (time_t) -1;
+	device->devtime = 0;
 
 	// Open the device.
 	int rc = serial_open (&device->port, name);
@@ -265,6 +270,10 @@ reefnet_sensus_device_handshake (device_t *abstract, unsigned char *data, unsign
 		array_uint32_le (handshake + 8));
 #endif
 
+	// Store the clock calibration values.
+	device->systime = time (NULL);
+	device->devtime = array_uint32_le (handshake + 8);
+
 	memcpy (data, handshake + 2, REEFNET_SENSUS_HANDSHAKE_SIZE);
 
 	// Emit a device info event.
diff --git a/src/reefnet_sensuspro.c b/src/reefnet_sensuspro.c
index 5756320..944ac42 100644
--- a/src/reefnet_sensuspro.c
+++ b/src/reefnet_sensuspro.c
@@ -21,6 +21,7 @@
 
 #include <string.h> // memcmp, memcpy
 #include <stdlib.h> // malloc, free
+#include <time.h>   // time
 
 #include "device-private.h"
 #include "reefnet_sensuspro.h"
@@ -46,6 +47,8 @@ struct reefnet_sensuspro_device_t {
 	device_t base;
 	struct serial *port;
 	unsigned int timestamp;
+	unsigned int devtime;
+	time_t systime;
 };
 
 static device_status_t reefnet_sensuspro_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size);
@@ -95,6 +98,8 @@ reefnet_sensuspro_device_open (device_t **out, const char* name)
 	// Set the default values.
 	device->port = NULL;
 	device->timestamp = 0;
+	device->systime = (time_t) -1;
+	device->devtime = 0;
 
 	// Open the device.
 	int rc = serial_open (&device->port, name);
@@ -234,6 +239,10 @@ reefnet_sensuspro_device_handshake (device_t *abstract, unsigned char *data, uns
 		array_uint32_le (handshake + 6));
 #endif
 
+	// Store the clock calibration values.
+	device->systime = time (NULL);
+	device->devtime = array_uint32_le (handshake + 6);
+
 	memcpy (data, handshake, REEFNET_SENSUSPRO_HANDSHAKE_SIZE);
 
 	// Emit a device info event.
diff --git a/src/reefnet_sensusultra.c b/src/reefnet_sensusultra.c
index dc0c418..2cd3304 100644
--- a/src/reefnet_sensusultra.c
+++ b/src/reefnet_sensusultra.c
@@ -21,7 +21,8 @@
 
 #include <string.h> // memcmp, memcpy
 #include <stdlib.h> // malloc, free
-#include <assert.h>
+#include <assert.h> // assert
+#include <time.h>   // time
 
 #include "device-private.h"
 #include "reefnet_sensusultra.h"
@@ -51,6 +52,8 @@ struct reefnet_sensusultra_device_t {
 	struct serial *port;
 	unsigned int maxretries;
 	unsigned int timestamp;
+	unsigned int devtime;
+	time_t systime;
 };
 
 static device_status_t reefnet_sensusultra_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size);
@@ -101,6 +104,8 @@ reefnet_sensusultra_device_open (device_t **out, const char* name)
 	device->port = NULL;
 	device->maxretries = 2;
 	device->timestamp = 0;
+	device->systime = (time_t) -1;
+	device->devtime = 0;
 
 	// Open the device.
 	int rc = serial_open (&device->port, name);
@@ -350,6 +355,10 @@ reefnet_sensusultra_device_handshake (device_t *abstract, unsigned char *data, u
 		array_uint16_le (handshake + 22));
 #endif
 
+	// Store the clock calibration values.
+	device->systime = time (NULL);
+	device->devtime = array_uint32_le (handshake + 4);
+
 	memcpy (data, handshake, REEFNET_SENSUSULTRA_HANDSHAKE_SIZE);
 
 	// Emit a device info event.
diff --git a/src/uwatec_aladin.c b/src/uwatec_aladin.c
index 6c123d9..f588217 100644
--- a/src/uwatec_aladin.c
+++ b/src/uwatec_aladin.c
@@ -21,6 +21,8 @@
 
 #include <stdlib.h> // malloc, free
 #include <memory.h> // memcpy
+#include <time.h>   // time
+#include <assert.h> // assert
 
 #include "device-private.h"
 #include "uwatec_aladin.h"
@@ -53,6 +55,8 @@ struct uwatec_aladin_device_t {
 	device_t base;
 	struct serial *port;
 	unsigned int timestamp;
+	unsigned int devtime;
+	time_t systime;
 };
 
 static device_status_t uwatec_aladin_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size);
@@ -101,6 +105,8 @@ uwatec_aladin_device_open (device_t **out, const char* name)
 	// Set the default values.
 	device->port = NULL;
 	device->timestamp = 0;
+	device->systime = (time_t) -1;
+	device->devtime = 0;
 
 	// Open the device.
 	int rc = serial_open (&device->port, name);
@@ -232,6 +238,9 @@ uwatec_aladin_device_dump (device_t *abstract, unsigned char data[], unsigned in
 		}
 	}
 
+	// Fetch the current system time.
+	time_t now = time (NULL);
+
 	// Update and emit a progress event.
 	progress.current += 4;
 	device_event_emit (abstract, DEVICE_EVENT_PROGRESS, &progress);
@@ -258,6 +267,10 @@ uwatec_aladin_device_dump (device_t *abstract, unsigned char data[], unsigned in
 		return DEVICE_STATUS_PROTOCOL;
 	}
 
+	// Store the clock calibration values.
+	device->systime = now;
+	device->devtime = array_uint32_be (answer + HEADER + 0x7f8);
+
 	memcpy (data, answer, UWATEC_ALADIN_MEMORY_SIZE);
 
 	if (result)
diff --git a/src/uwatec_memomouse.c b/src/uwatec_memomouse.c
index be3ac59..b358988 100644
--- a/src/uwatec_memomouse.c
+++ b/src/uwatec_memomouse.c
@@ -22,6 +22,7 @@
 #include <string.h> // memcmp, memcpy
 #include <stdlib.h> // malloc, free
 #include <assert.h> // assert
+#include <time.h>   // time
 
 #include "device-private.h"
 #include "uwatec_memomouse.h"
@@ -49,6 +50,8 @@ struct uwatec_memomouse_device_t {
 	device_t base;
 	struct serial *port;
 	unsigned int timestamp;
+	unsigned int devtime;
+	time_t systime;
 };
 
 static device_status_t uwatec_memomouse_device_set_fingerprint (device_t *device, const unsigned char data[], unsigned int size);
@@ -97,6 +100,8 @@ uwatec_memomouse_device_open (device_t **out, const char* name)
 	// Set the default values.
 	device->port = NULL;
 	device->timestamp = 0;
+	device->systime = (time_t) -1;
+	device->devtime = 0;
 
 	// Open the device.
 	int rc = serial_open (&device->port, name);
@@ -473,8 +478,19 @@ uwatec_memomouse_dump (uwatec_memomouse_device_t *device, unsigned char *data[],
 		serial_sleep (100);
 	}
 
+	// Fetch the current system time.
+	time_t now = time (NULL);
+
 	// Read the data packet.
-	return uwatec_memomouse_read_packet_inner (device, data, size, &progress);
+	rc = uwatec_memomouse_read_packet_inner (device, data, size, &progress);
+	if (rc != DEVICE_STATUS_SUCCESS)
+		return rc;
+
+	// Store the clock calibration values.
+	device->systime = now;
+	device->devtime = array_uint32_le (*data + 2 + 1);
+
+	return DEVICE_STATUS_SUCCESS;
 }
 
 
diff --git a/src/uwatec_smart.c b/src/uwatec_smart.c
index 12f99a2..0de8a4f 100644
--- a/src/uwatec_smart.c
+++ b/src/uwatec_smart.c
@@ -47,6 +47,8 @@ struct uwatec_smart_device_t {
 	struct irda *socket;
 	unsigned int address;
 	unsigned int timestamp;
+	unsigned int devtime;
+	time_t systime;
 };
 
 static device_status_t uwatec_smart_device_set_fingerprint (device_t *device, const unsigned char data[], unsigned int size);
@@ -121,6 +123,8 @@ uwatec_smart_device_open (device_t **out)
 	device->socket = NULL;
 	device->address = 0;
 	device->timestamp = 0;
+	device->systime = (time_t) -1;
+	device->devtime = 0;
 
 	irda_init ();
 
@@ -394,6 +398,10 @@ uwatec_smart_dump (uwatec_smart_device_t *device, unsigned char *data[], unsigne
 	unsigned int timestamp = array_uint32_le (answer);
 	message ("handshake: timestamp=0x%08x\n", timestamp);
 
+	// Store the clock calibration values.
+	device->systime = time (NULL);
+	device->devtime = timestamp;
+
 	// Update and emit a progress event.
 	progress.current += 9;
 	device_event_emit (&device->base, DEVICE_EVENT_PROGRESS, &progress);