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diff --git a/make.mk b/make.mk
index ee40100..5610c1f 100644
--- a/make.mk
+++ b/make.mk
@@ -64,7 +64,7 @@ LDFLAGS += -mcpu=cortex-m0plus -mthumb
LDFLAGS += -Wl,--gc-sections
LDFLAGS += -Wl,--script=$(TOP)/watch-library/hardware/linker/saml22j18.ld
LDFLAGS += -Wl,--print-memory-usage
-LDFLAGS += -g
+LDFLAGS += -g -u set_time
LIBS += -lm
diff --git a/movement/make/Makefile b/movement/make/Makefile
index a336b85..5fa1322 100644
--- a/movement/make/Makefile
+++ b/movement/make/Makefile
@@ -51,6 +51,7 @@ SRCS += \
../../littlefs/lfs.c \
../../littlefs/lfs_util.c \
../movement.c \
+ ../set_time.c \
../filesystem.c \
../shell.c \
../shell_cmd_list.c \
diff --git a/movement/movement.c b/movement/movement.c
index 230dbe5..8abd6e7 100644
--- a/movement/movement.c
+++ b/movement/movement.c
@@ -412,6 +412,7 @@ void app_wake_from_backup(void) {
void app_setup(void) {
watch_store_backup_data(movement_state.settings.reg, 0);
+ set_time();
static bool is_first_launch = true;
diff --git a/movement/set_time.c b/movement/set_time.c
new file mode 100644
index 0000000..27cea25
--- /dev/null
+++ b/movement/set_time.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "watch.h"
+#include "movement.h"
+#include "watch_utility.h"
+
+#define SYS_TIME 0x11
+
+extern movement_state_t movement_state;
+
+static inline int32_t
+get_tz_offset (movement_settings_t * settings)
+{
+ return movement_timezone_offsets[settings->bit.time_zone] * 60;
+}
+
+static int32_t
+sys_time (void)
+{
+ int32_t value = SYS_TIME;
+ asm ("mov r0,%0; bkpt $0xab; mov %0,r0": "+r" (value): :"r0");
+ return value;
+}
+
+void __attribute__((used)) set_time (void)
+{
+ int32_t t;
+
+ t = sys_time ();
+
+ watch_date_time wdt = watch_utility_date_time_from_unix_time (t,
+ get_tz_offset
+ (&movement_state.
+ settings));
+ watch_rtc_set_date_time (wdt);
+}
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