diff --git a/include/errno.h b/include/errno.h
index 47aeed1..4092e5c 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -15,6 +15,7 @@
 # define ENODEV		19
 # define EINVAL		22
 # define ERANGE		34
+# define EAGAIN		35
 # define ENOSYS		78
 # define ENOTSUP	86
 
diff --git a/include/project.conf b/include/project.conf
index 72473a8..d2e8bc6 100644
--- a/include/project.conf
+++ b/include/project.conf
@@ -1,2 +1,2 @@
 subdirs=kernel,sys
-dist=Makefile,elf.h,errno.h,fcntl.h,limits.h,stdarg.h,stdbool.h,stddef.h,stdint.h,stdio.h,stdlib.h,string.h,unistd.h
+dist=Makefile,elf.h,errno.h,fcntl.h,limits.h,stdarg.h,stdbool.h,stddef.h,stdint.h,stdio.h,stdlib.h,string.h,time.h,unistd.h
diff --git a/include/time.h b/include/time.h
new file mode 100644
index 0000000..975b9ad
--- /dev/null
+++ b/include/time.h
@@ -0,0 +1,21 @@
+/* $Id$ */
+/* Copyright (c) 2018 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS uKernel */
+
+
+
+#ifndef UKERNEL_TIME_H
+# define UKERNEL_TIME_H
+
+
+/* types */
+# ifndef time_t
+#  define time_t time_t
+typedef long long time_t;
+# endif
+
+
+/* functions */
+time_t time(time_t * t);
+
+#endif /* !UKERNEL_TIME_H */
diff --git a/src/drivers/clock.c b/src/drivers/clock.c
new file mode 100644
index 0000000..3e950ad
--- /dev/null
+++ b/src/drivers/clock.c
@@ -0,0 +1,72 @@
+/* $Id$ */
+/* Copyright (c) 2018 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS uKernel */
+
+
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "clock.h"
+
+
+/* private */
+/* variables */
+static ukClock * _clock = NULL;
+
+
+/* public */
+/* variables */
+#if defined(__amd64__) || defined(__i386__)
+extern ukClock cmos_clock;
+#endif
+
+
+/* functions */
+/* clock_init */
+ukClock * clock_init(ukBus * bus, char const * name)
+{
+	ukClock * clock = NULL;
+	const ukClock * drivers[] = {
+#if defined(__amd64__) || defined(__i386__)
+		&cmos_clock
+#endif
+	};
+	size_t i;
+
+	for(i = 0; i < sizeof(drivers) / sizeof(*drivers); i++)
+		if(strncmp(drivers[i]->name, name,
+					strlen(drivers[i]->name)) == 0
+				&& drivers[i]->init != NULL)
+		{
+			fprintf(stderr, "%s clock%s%s\n", name, (bus != NULL)
+					? " at " : "",
+					(bus != NULL) ? bus->name : "");
+			clock = drivers[i]->init(bus);
+		}
+	if(clock == NULL)
+		errno = ENODEV;
+	else if(_clock == NULL)
+		_clock = clock;
+	return clock;
+}
+
+
+/* accessors */
+/* clock_get_default */
+ukClock * clock_get_default(void)
+{
+	if(_clock == NULL)
+		errno = ENODEV;
+	return _clock;
+}
+
+
+/* clock_get_time */
+int clock_get_time(ukClock * clock, time_t * time)
+{
+	if(clock == NULL
+			&& (clock = clock_get_default()) == NULL)
+		return -1;
+	return clock->get_time(clock, time);
+}
diff --git a/src/drivers/clock.h b/src/drivers/clock.h
new file mode 100644
index 0000000..bd546f3
--- /dev/null
+++ b/src/drivers/clock.h
@@ -0,0 +1,42 @@
+/* $Id$ */
+/* Copyright (c) 2018 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS uKernel */
+
+
+
+#ifndef UKERNEL_DRIVERS_CLOCK_H
+# define UKERNEL_DRIVERS_CLOCK_H
+
+# include <time.h>
+# include "bus.h"
+
+
+/* public */
+/* types */
+typedef struct _ukClock ukClock;
+
+typedef struct _ukClockData ukClockData;
+
+struct _ukClock
+{
+	char name[16];
+
+	ukClock * (*init)(ukBus * bus);
+	void (*destroy)(ukClock * clock);
+
+	int (*get_time)(ukClock * clock, time_t * time);
+
+	ukClockData * data;
+};
+
+
+/* prototypes */
+ukClock * clock_init(ukBus * bus, char const * name);
+void clock_destroy(ukClock * clock);
+
+/* accessors */
+ukClock * clock_get_default(void);
+
+int clock_get_time(ukClock * clock, time_t * time);
+
+#endif /* !UKERNEL_DRIVERS_CLOCK_H */
diff --git a/src/drivers/clock/cmos.c b/src/drivers/clock/cmos.c
new file mode 100644
index 0000000..bbc36e4
--- /dev/null
+++ b/src/drivers/clock/cmos.c
@@ -0,0 +1,140 @@
+/* $Id$ */
+/* Copyright (c) 2018 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS uKernel */
+
+
+
+#include <stdlib.h>
+#include <errno.h>
+#include "drivers/clock.h"
+
+
+/* private */
+/* types */
+typedef struct _ukClock CMOSClock;
+
+typedef struct _ukClockData
+{
+	ukBus * bus;
+} CMOSClockData;
+
+
+/* constants */
+#define CMOS_REGISTER_SECONDS	0x00
+#define CMOS_REGISTER_MINUTES	0x02
+#define CMOS_REGISTER_HOURS	0x04
+#define CMOS_REGISTER_WEEKDAY	0x06
+#define CMOS_REGISTER_DAY	0x07
+#define CMOS_REGISTER_MONTH	0x08
+#define CMOS_REGISTER_YEAR	0x09
+
+
+/* prototypes */
+/* console */
+static CMOSClock * _cmos_clock_init(ukBus * bus);
+static void _cmos_clock_destroy(CMOSClock * clock);
+
+static int _cmos_clock_get_time(CMOSClock * console, time_t * time);
+
+
+/* public */
+/* variables */
+/* console */
+CMOSClock cmos_clock =
+{
+	"cmos",
+	_cmos_clock_init,
+	_cmos_clock_destroy,
+	_cmos_clock_get_time,
+	NULL
+};
+
+
+/* functions */
+/* console */
+/* cmos_clock_init */
+static CMOSClock * _cmos_clock_init(ukBus * bus)
+{
+	CMOSClock * clock = &cmos_clock;
+	CMOSClockData * data;
+
+	if(bus == NULL)
+	{
+		errno = ENODEV;
+		return NULL;
+	}
+	if((data = malloc(sizeof(*data))) == NULL)
+		return NULL;
+	data->bus = bus;
+	clock->data = data;
+	return clock;
+}
+
+
+/* cmos_clock_destroy */
+static void _cmos_clock_destroy(CMOSClock * clock)
+{
+	free(clock->data);
+}
+
+
+/* cmos_clock_get_time */
+static int _get_time_do(ukBus * bus, unsigned char * seconds,
+		unsigned char * minutes, unsigned char * hours,
+		unsigned char * day, unsigned char * month,
+		unsigned char * year);
+static int _cmos_clock_get_time(CMOSClock * clock, time_t * time)
+{
+	CMOSClockData * data = clock->data;
+	unsigned char seconds, s;
+	unsigned char minutes, m;
+	unsigned char hours, h;
+	unsigned char day, d;
+	unsigned char month, M;
+	unsigned char year, y;
+	size_t i;
+
+	if(time == NULL)
+	{
+		errno = EINVAL;
+		return -1;
+	}
+	for(i = 0; i < 3; i++)
+	{
+		if(_get_time_do(data->bus, &seconds, &minutes, &hours, &day,
+					&month, &year) != 0
+				|| _get_time_do(data->bus, &s, &m, &h, &d, &M,
+					&y) != 0)
+			return -1;
+		if(seconds == s && minutes == m && hours == h
+				&& day == d && month == M && year == y)
+			break;
+	}
+	if(i == 3)
+	{
+		errno = EAGAIN;
+		return -1;
+	}
+	/* FIXME this is not correct */
+	*time = seconds + (minutes * 60) + (hours * 60 * 24)
+		+ (day * 60 * 24 * 30) + (month * 60 * 24 * 12)
+		+ (((year >= 70) ? (year - 1970) : (year + 30))
+				* 60 * 24 * 365);
+	return 0;
+}
+
+static int _get_time_do(ukBus * bus, unsigned char * seconds,
+		unsigned char * minutes, unsigned char * hours,
+		unsigned char * day, unsigned char * month,
+		unsigned char * year)
+{
+	/* FIXME check first if the data is available */
+	if(bus->read8(bus, CMOS_REGISTER_SECONDS, seconds) != 0
+			|| bus->read8(bus, CMOS_REGISTER_MINUTES, minutes) != 0
+			|| bus->read8(bus, CMOS_REGISTER_HOURS, hours) != 0
+			|| bus->read8(bus, CMOS_REGISTER_DAY, day) != 0
+			|| bus->read8(bus, CMOS_REGISTER_MONTH, month) != 0
+			|| bus->read8(bus, CMOS_REGISTER_YEAR, year) != 0)
+		return -1;
+	return 0;
+}
diff --git a/src/drivers/clock/project.conf b/src/drivers/clock/project.conf
new file mode 100644
index 0000000..d1f3c1d
--- /dev/null
+++ b/src/drivers/clock/project.conf
@@ -0,0 +1,15 @@
+targets=cmos.o,sys.o
+cppflags_force=-nostdinc -isystem ../../../include -I../..
+cflags_force=`../../../tools/platform.sh -V UKERNEL_CFLAGS -C "$$ARCH"`
+cflags=-W -Wall -g -O2
+ldflags_force=`../../../tools/platform.sh -V UKERNEL_LDFLAGS -C "$$ARCH"`
+dist=Makefile
+
+#targets
+[cmos.o]
+type=object
+sources=cmos.c
+
+[sys.o]
+type=object
+sources=sys.c
diff --git a/src/drivers/clock/sys.c b/src/drivers/clock/sys.c
new file mode 100644
index 0000000..5c37d98
--- /dev/null
+++ b/src/drivers/clock/sys.c
@@ -0,0 +1,59 @@
+/* $Id$ */
+/* Copyright (c) 2018 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS uKernel */
+
+
+
+#include <stddef.h>
+#include "drivers/clock.h"
+
+
+/* private */
+/* types */
+typedef struct _ukClock SysClock;
+
+
+/* prototypes */
+/* console */
+static SysClock * _sys_clock_init(ukBus * bus);
+
+static int _sys_clock_get_time(SysClock * console, time_t * time);
+
+extern time_t _time(time_t * t);
+
+
+/* public */
+/* variables */
+/* console */
+SysClock sys_clock =
+{
+	"sys",
+	_sys_clock_init,
+	NULL,
+	_sys_clock_get_time,
+	NULL
+};
+
+
+/* functions */
+/* console */
+/* sys_clock_init */
+static SysClock * _sys_clock_init(ukBus * bus)
+{
+	(void) bus;
+
+	return &sys_clock;
+}
+
+
+/* sys_clock_get_time */
+static int _sys_clock_get_time(SysClock * clock, time_t * time)
+{
+	time_t t;
+
+	if(_time(&t) == -1)
+		return -1;
+	if(time != NULL)
+		*time = t;
+	return 0;
+}
diff --git a/src/drivers/project.conf b/src/drivers/project.conf
index 3d9dcb6..1302e5b 100644
--- a/src/drivers/project.conf
+++ b/src/drivers/project.conf
@@ -1,5 +1,5 @@
-subdirs=boot,bus,console
-targets=bus.o,console.o
+subdirs=boot,bus,clock,console
+targets=bus.o,clock.o,console.o
 cppflags_force=-nostdinc -isystem ../../include -I..
 as=$(CC)
 asflags_force=$(CFLAGSF) $(CFLAGS) -c
@@ -13,6 +13,10 @@ dist=Makefile,bus.h,console.h
 type=object
 sources=bus.c
 
+[clock.o]
+type=object
+sources=clock.c
+
 [console.o]
 type=object
 sources=console.c
@@ -21,5 +25,8 @@ sources=console.c
 [bus.c]
 depends=bus.h,bus/ioport.c
 
+[clock.c]
+depends=bus.h,clock.h
+
 [console.c]
 depends=bus.h,console/vga.h,console/vga.c
diff --git a/src/kernel/project.conf b/src/kernel/project.conf
index 325c15b..458448f 100644
--- a/src/kernel/project.conf
+++ b/src/kernel/project.conf
@@ -27,8 +27,8 @@ sources=../common/crtn.S
 [uKernel.bin]
 type=binary
 sources=arch.S,gdt.c,main.c,multiboot.c,start.S
-ldflags=$(OBJDIR)crti.o $(OBJDIR)crtbegin.o $(OBJDIR)../drivers/boot/multiboot.o $(OBJDIR)../drivers/bus.o $(OBJDIR)../drivers/bus/cmos.o $(OBJDIR)../drivers/bus/ioport.o $(OBJDIR)../drivers/console.o $(OBJDIR)../drivers/console/uart.o $(OBJDIR)../drivers/console/vesa.o $(OBJDIR)../drivers/console/vga.o $(OBJDIR)../lib/libuKernel.a $(OBJDIR)crtend.o $(OBJDIR)crtn.o `$(CC) -print-libgcc-file-name`
-depends=$(OBJDIR)crtbegin.o,$(OBJDIR)crtend.o,$(OBJDIR)crti.o,$(OBJDIR)crtn.o,$(OBJDIR)../drivers/boot/multiboot.o,$(OBJDIR)../drivers/bus.o,$(OBJDIR)../drivers/bus/cmos.o,$(OBJDIR)../drivers/bus/ioport.o,$(OBJDIR)../drivers/console.o,$(OBJDIR)../drivers/console/uart.o,$(OBJDIR)../drivers/console/vesa.o,$(OBJDIR)../drivers/console/vga.o,$(OBJDIR)../lib/libuKernel.a,../arch/amd64/uKernel.ld,../arch/i386/uKernel.ld
+ldflags=$(OBJDIR)crti.o $(OBJDIR)crtbegin.o $(OBJDIR)../drivers/boot/multiboot.o $(OBJDIR)../drivers/bus.o $(OBJDIR)../drivers/bus/cmos.o $(OBJDIR)../drivers/bus/ioport.o $(OBJDIR)../drivers/clock.o $(OBJDIR)../drivers/clock/cmos.o $(OBJDIR)../drivers/console.o $(OBJDIR)../drivers/console/uart.o $(OBJDIR)../drivers/console/vesa.o $(OBJDIR)../drivers/console/vga.o $(OBJDIR)../lib/libuKernel.a $(OBJDIR)crtend.o $(OBJDIR)crtn.o `$(CC) -print-libgcc-file-name`
+depends=$(OBJDIR)crtbegin.o,$(OBJDIR)crtend.o,$(OBJDIR)crti.o,$(OBJDIR)crtn.o,$(OBJDIR)../drivers/boot/multiboot.o,$(OBJDIR)../drivers/bus.o,$(OBJDIR)../drivers/bus/cmos.o,$(OBJDIR)../drivers/bus/ioport.o,$(OBJDIR)../drivers/clock.o,$(OBJDIR)../drivers/clock/cmos.o,$(OBJDIR)../drivers/console.o,$(OBJDIR)../drivers/console/uart.o,$(OBJDIR)../drivers/console/vesa.o,$(OBJDIR)../drivers/console/vga.o,$(OBJDIR)../lib/libuKernel.a,../arch/amd64/uKernel.ld,../arch/i386/uKernel.ld
 
 #sources
 [arch.S]
diff --git a/src/lib/project.conf b/src/lib/project.conf
index b224ace..8e12749 100644
--- a/src/lib/project.conf
+++ b/src/lib/project.conf
@@ -7,7 +7,7 @@ dist=Makefile,ssp.h
 
 [libuKernel]
 type=library
-sources=ctype.c,errno.c,ssp.c,stdio.c,stdlib.c,string.c,sys/mman.c,unistd.c
+sources=ctype.c,errno.c,ssp.c,stdio.c,stdlib.c,string.c,sys/mman.c,time.c,unistd.c
 
 [ctype.c]
 depends=../../include/ctype.h
@@ -29,3 +29,6 @@ depends=../../include/string.h
 
 [sys/mman.c]
 depends=../../include/sys/mman.h
+
+[time.c]
+depends=../../include/time.h,../drivers/clock.h
diff --git a/src/lib/time.c b/src/lib/time.c
new file mode 100644
index 0000000..1da13cd
--- /dev/null
+++ b/src/lib/time.c
@@ -0,0 +1,23 @@
+/* $Id$ */
+/* Copyright (c) 2018 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS uKernel */
+
+
+
+#include <stddef.h>
+#include <time.h>
+#include "drivers/clock.h"
+
+
+/* functions */
+/* time */
+time_t time(time_t * time)
+{
+	time_t t;
+
+	if(clock_get_time(NULL, &t) != 0)
+		return -1;
+	if(time != NULL)
+		*time = t;
+	return t;
+}
diff --git a/tools/arch/i386/start.S b/tools/arch/i386/start.S
index 728012b..a1ba466 100644
--- a/tools/arch/i386/start.S
+++ b/tools/arch/i386/start.S
@@ -35,6 +35,14 @@ _exit:
 	jmp	_syscall
 
 
+/* gettimeofday */
+.global _gettimeofday
+.type _gettimeofday, @function
+_gettimeofday:
+	mov	$0x1a2, %eax
+	jmp	_syscall
+
+
 /* read */
 .global _read
 .type _read, @function
@@ -99,6 +107,23 @@ _start:
 	hlt
 
 
+/* time */
+.global _time
+.type _time, @function
+_time:
+	push	$0x0
+	sub	$0xc, %esp
+	push	%esp
+	call	_gettimeofday
+	cmp	$-1, %eax
+	je	1f
+	mov	0xc(%esp), %eax
+	mov	0x8(%esp), %edx
+1:
+	add	$0x14, %esp
+	ret
+
+
 /* write */
 .global _write
 .type _write, @function
diff --git a/tools/clock.c b/tools/clock.c
new file mode 100644
index 0000000..6d856bf
--- /dev/null
+++ b/tools/clock.c
@@ -0,0 +1,74 @@
+/* $Id$ */
+/* Copyright (c) 2018 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS uKernel */
+
+
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "drivers/clock.h"
+
+
+/* private */
+/* variables */
+static ukClock * _clock = NULL;
+
+
+/* public */
+/* variables */
+extern ukClock sys_clock;
+
+
+/* functions */
+/* clock_init */
+ukClock * clock_init(ukBus * bus, char const * name)
+{
+	const ukClock * drivers[] = {
+		&sys_clock
+	};
+	size_t i;
+	ukClock * clock = NULL;
+
+	for(i = 0; i < sizeof(drivers) / sizeof(*drivers); i++)
+		if(strncmp(drivers[i]->name, name,
+					strlen(drivers[i]->name)) == 0
+				&& drivers[i]->init != NULL)
+		{
+			printf("%s%s%s\n", name, (bus != NULL) ? " at " : "",
+					(bus != NULL) ? bus->name : "");
+			clock = drivers[i]->init(bus);
+		}
+	if(clock == NULL)
+	{
+		errno = ENODEV;
+		return NULL;
+	}
+	else if(_clock == NULL)
+		_clock = clock;
+	return clock;
+}
+
+
+/* FIXME code duplication with src/drivers/clock.c */
+/* accessors */
+/* clock_get_default */
+ukClock * clock_get_default(void)
+{
+	if(_clock == NULL)
+		errno = ENODEV;
+	return _clock;
+}
+
+
+/* clock_get_time */
+int clock_get_time(ukClock * clock, time_t * time)
+{
+	if(clock == NULL
+			&& (clock = clock_get_default()) == NULL)
+	{
+		errno = ENODEV;
+		return -1;
+	}
+	return clock->get_time(clock, time);
+}
diff --git a/tools/init.c b/tools/init.c
index 6a394a0..b8de7b0 100644
--- a/tools/init.c
+++ b/tools/init.c
@@ -6,9 +6,11 @@
 
 #include <stddef.h>
 #include "drivers/bus.h"
+#include "drivers/clock.h"
 #include "drivers/console.h"
 
 #define TOOLS_BUS	"tty"
+#define TOOLS_CLOCK	"sys"
 #define TOOLS_CONSOLE	"stdio"
 
 
@@ -18,5 +20,6 @@ int _init(void)
 
 	bus = bus_init(NULL, TOOLS_BUS);
 	console_init(bus, TOOLS_CONSOLE);
+	clock_init(NULL, TOOLS_CLOCK);
 	return 0;
 }
diff --git a/tools/project.conf b/tools/project.conf
index 3bc3f5e..7e265ed 100644
--- a/tools/project.conf
+++ b/tools/project.conf
@@ -14,9 +14,9 @@ sources=start.S
 
 [uKernel]
 type=binary
-sources=bus.c,console.c,init.c,main.c
-ldflags=$(OBJDIR)start.o $(OBJDIR)../src/lib/libuKernel.a $(OBJDIR)../src/drivers/console/stdio.o `$(CC) -print-libgcc-file-name`
-depends=$(OBJDIR)start.o,$(OBJDIR)../src/lib/libuKernel.a,$(OBJDIR)../src/drivers/console/stdio.o
+sources=bus.c,clock.c,console.c,init.c,main.c
+ldflags=$(OBJDIR)start.o $(OBJDIR)../src/lib/libuKernel.a $(OBJDIR)../src/drivers/clock/sys.o $(OBJDIR)../src/drivers/console/stdio.o `$(CC) -print-libgcc-file-name`
+depends=$(OBJDIR)start.o,$(OBJDIR)../src/lib/libuKernel.a,$(OBJDIR)../src/drivers/clock/sys.o,$(OBJDIR)../src/drivers/console/stdio.o
 
 #sources
 [bus.c]