diff --git a/applications/plugins/clock/application.fam b/applications/plugins/clock/application.fam
new file mode 100644
index 00000000..590f5dfe
--- /dev/null
+++ b/applications/plugins/clock/application.fam
@@ -0,0 +1,10 @@
+App(
+    appid="clock",
+    name="Clock",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="clock_app",
+    requires=["gui"],
+    stack_size=2 * 1024,
+    fap_icon="clock.png",
+    fap_category="Tools",
+)
diff --git a/applications/plugins/clock/clock.png b/applications/plugins/clock/clock.png
new file mode 100644
index 00000000..0d96df10
Binary files /dev/null and b/applications/plugins/clock/clock.png differ
diff --git a/applications/plugins/clock/clock_app.c b/applications/plugins/clock/clock_app.c
new file mode 100644
index 00000000..e196f0d2
--- /dev/null
+++ b/applications/plugins/clock/clock_app.c
@@ -0,0 +1,136 @@
+#include <furi.h>
+#include <furi_hal.h>
+
+#include <gui/gui.h>
+#include <locale/locale.h>
+
+typedef enum {
+    ClockEventTypeTick,
+    ClockEventTypeKey,
+} ClockEventType;
+
+typedef struct {
+    ClockEventType type;
+    InputEvent input;
+} ClockEvent;
+
+typedef struct {
+    FuriString* buffer;
+    FuriHalRtcDateTime datetime;
+    LocaleTimeFormat timeformat;
+    LocaleDateFormat dateformat;
+} ClockData;
+
+typedef struct {
+    FuriMutex* mutex;
+    FuriMessageQueue* queue;
+    ClockData* data;
+} Clock;
+
+static void clock_input_callback(InputEvent* input_event, FuriMessageQueue* queue) {
+    furi_assert(queue);
+    ClockEvent event = {.type = ClockEventTypeKey, .input = *input_event};
+    furi_message_queue_put(queue, &event, FuriWaitForever);
+}
+
+static void clock_render_callback(Canvas* canvas, void* ctx) {
+    Clock* clock = ctx;
+    if(furi_mutex_acquire(clock->mutex, 200) != FuriStatusOk) {
+        return;
+    }
+
+    ClockData* data = clock->data;
+
+    canvas_set_font(canvas, FontBigNumbers);
+    locale_format_time(data->buffer, &data->datetime, data->timeformat, true);
+    canvas_draw_str_aligned(
+        canvas, 64, 28, AlignCenter, AlignCenter, furi_string_get_cstr(data->buffer));
+
+    // Special case to cover missing glyphs in FontBigNumbers
+    if(data->timeformat == LocaleTimeFormat12h) {
+        size_t time_width = canvas_string_width(canvas, furi_string_get_cstr(data->buffer));
+        canvas_set_font(canvas, FontPrimary);
+        canvas_draw_str_aligned(
+            canvas,
+            64 + (time_width / 2) - 10,
+            31,
+            AlignLeft,
+            AlignCenter,
+            (data->datetime.hour > 12) ? "AM" : "PM");
+    }
+
+    canvas_set_font(canvas, FontSecondary);
+    locale_format_date(data->buffer, &data->datetime, data->dateformat, "/");
+    canvas_draw_str_aligned(
+        canvas, 64, 42, AlignCenter, AlignTop, furi_string_get_cstr(data->buffer));
+
+    furi_mutex_release(clock->mutex);
+}
+
+static void clock_tick(void* ctx) {
+    furi_assert(ctx);
+    FuriMessageQueue* queue = ctx;
+    ClockEvent event = {.type = ClockEventTypeTick};
+    // It's OK to loose this event if system overloaded
+    furi_message_queue_put(queue, &event, 0);
+}
+
+int32_t clock_app(void* p) {
+    UNUSED(p);
+    Clock* clock = malloc(sizeof(Clock));
+    clock->data = malloc(sizeof(ClockData));
+    clock->data->buffer = furi_string_alloc();
+
+    clock->queue = furi_message_queue_alloc(8, sizeof(ClockEvent));
+    clock->mutex = furi_mutex_alloc(FuriMutexTypeNormal);
+
+    furi_hal_rtc_get_datetime(&clock->data->datetime);
+    clock->data->timeformat = locale_get_time_format();
+    clock->data->dateformat = locale_get_date_format();
+
+    // Set ViewPort callbacks
+    ViewPort* view_port = view_port_alloc();
+    view_port_draw_callback_set(view_port, clock_render_callback, clock);
+    view_port_input_callback_set(view_port, clock_input_callback, clock->queue);
+
+    FuriTimer* timer = furi_timer_alloc(clock_tick, FuriTimerTypePeriodic, clock->queue);
+
+    // Open GUI and register view_port
+    Gui* gui = furi_record_open(RECORD_GUI);
+    gui_add_view_port(gui, view_port, GuiLayerFullscreen);
+
+    furi_timer_start(timer, 100);
+
+    // Main loop
+    ClockEvent event;
+    for(bool processing = true; processing;) {
+        furi_check(furi_message_queue_get(clock->queue, &event, FuriWaitForever) == FuriStatusOk);
+        furi_mutex_acquire(clock->mutex, FuriWaitForever);
+        if(event.type == ClockEventTypeKey) {
+            if(event.input.type == InputTypeShort && event.input.key == InputKeyBack) {
+                processing = false;
+            }
+        } else if(event.type == ClockEventTypeTick) {
+            furi_hal_rtc_get_datetime(&clock->data->datetime);
+        }
+
+        furi_mutex_release(clock->mutex);
+        view_port_update(view_port);
+    }
+
+    furi_timer_free(timer);
+    view_port_enabled_set(view_port, false);
+    gui_remove_view_port(gui, view_port);
+    view_port_free(view_port);
+    furi_record_close(RECORD_GUI);
+
+    furi_message_queue_free(clock->queue);
+    furi_mutex_free(clock->mutex);
+
+    furi_string_free(clock->data->buffer);
+
+    free(clock->data);
+    free(clock);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/applications/services/locale/locale.c b/applications/services/locale/locale.c
index 07f56b1b..e8b6a9fc 100644
--- a/applications/services/locale/locale.c
+++ b/applications/services/locale/locale.c
@@ -51,6 +51,9 @@ void locale_format_time(
         } else {
             am_pm = 1;
         }
+        if(hours == 0) {
+            hours = 12;
+        }
     }
 
     if(show_seconds) {