diff --git a/.luacheckrc b/.luacheckrc
index 73a56b4..8142729 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -3,6 +3,8 @@
 
 globals = {
   "Focus",
+  "Day",
+  "Timer",
   "Util",
   "Decision",
   "Situation",
diff --git a/impostor.inc b/impostor.inc
index ab69e62..8f53b9b 100644
--- a/impostor.inc
+++ b/impostor.inc
@@ -8,6 +8,8 @@ system/system.util.lua
 system/system.print.lua
 system/system.input.lua
 system/system.focus.lua
+system/system.day.lua
+system/system.timer.lua
 system/system.ui.lua
 audio/audio.manager.lua
 audio/audio.songs.lua
diff --git a/inc/audio/audio.manager.lua b/inc/audio/audio.manager.lua
index 583ffd2..2e9f0eb 100644
--- a/inc/audio/audio.manager.lua
+++ b/inc/audio/audio.manager.lua
@@ -19,7 +19,6 @@ function Audio.music_play_room_street_1() end
 --- @within Audio
 function Audio.music_play_room_street_2() end
 --- Plays room music.
--- TODO: function name is incomplete, determine the correct room identifier
 --- @within Audio
 function Audio.music_play_room_() end
 --- Plays room work music.
diff --git a/inc/init/init.context.lua b/inc/init/init.context.lua
index 62cf5bb..2710a95 100644
--- a/inc/init/init.context.lua
+++ b/inc/init/init.context.lua
@@ -34,10 +34,12 @@ function Context.initial_data()
     minigame_button_mash = Minigame.get_default_button_mash(),
     minigame_rhythm = Minigame.get_default_rhythm(),
     meters = Meter.get_initial(),
+    timer = Timer.get_initial(),
     game = {
       current_screen = "home",
       current_situation = nil,
-    }
+    },
+    day_count = 1,
   }
 end
 
diff --git a/inc/init/init.meter.lua b/inc/init/init.meter.lua
index 31d1ef1..1548383 100644
--- a/inc/init/init.meter.lua
+++ b/inc/init/init.meter.lua
@@ -6,30 +6,12 @@ local COMBO_BASE_BONUS = 0.02
 local COMBO_MAX_BONUS = 0.16
 local COMBO_TIMEOUT_FRAMES = 600
 
--- 1800 frames = 30 seconds (1800 ÷ 60 = 30)
-local meter_timer_duration = 1800
-local meter_timer_decay_per_revolution = 20
-
 -- Internal meters for tracking game progress and player stats.
 Meter.COLOR_ISM = Config.colors.red
 Meter.COLOR_WPM = Config.colors.blue
 Meter.COLOR_BM = Config.colors.black
 Meter.COLOR_BG = Config.colors.meter_bg
 
---- Sets the number of frames for one full timer revolution.
---- @within Meter
---- @param frames number Frames per revolution (controls degradation speed).
-function Meter.set_timer_duration(frames)
-  meter_timer_duration = frames
-end
-
---- Sets the degradation amount applied to all meters per revolution.
---- @within Meter
---- @param amount number Amount to subtract from each meter per revolution.
-function Meter.set_timer_decay(amount)
-  meter_timer_decay_per_revolution = amount
-end
-
 --- Gets initial meter values.
 --- @within Meter
 --- @return result table Initial meter values. </br>
@@ -39,8 +21,7 @@ end
 --- * bm (number) Initial BM meter value.<br/>
 --- * combo (number) Current combo count.<br/>
 --- * combo_timer (number) Frames since last combo action.<br/>
---- * hidden (boolean) Whether meters are hidden.<br/>
---- * timer_progress (number) Clock timer revolution progress (0 to 1).
+--- * hidden (boolean) Whether meters are hidden.
 function Meter.get_initial()
   return {
     ism = METER_DEFAULT,
@@ -49,7 +30,6 @@ function Meter.get_initial()
     combo = 0,
     combo_timer = 0,
     hidden = false,
-    timer_progress = 0,
   }
 end
 
@@ -96,13 +76,6 @@ function Meter.update()
         m.combo_timer = 0
       end
     end
-    m.timer_progress = m.timer_progress + (1 / meter_timer_duration)
-    if m.timer_progress >= 1 then
-      m.timer_progress = m.timer_progress - 1
-      m.ism = math.max(0, m.ism - meter_timer_decay_per_revolution)
-      m.wpm = math.max(0, m.wpm - meter_timer_decay_per_revolution)
-      m.bm = math.max(0, m.bm - meter_timer_decay_per_revolution)
-    end
   end
 end
 
@@ -118,13 +91,6 @@ function Meter.add(key, amount)
   end
 end
 
---- Gets the timer decay as a percentage of the max meter value.
---- @within Meter
---- @return number The decay percentage per revolution (e.g. 2 means -2%).
-function Meter.get_timer_decay_percentage()
-  return math.floor(meter_timer_decay_per_revolution / METER_MAX * 100)
-end
-
 --- Called on minigame completion.
 --- @within Meter
 function Meter.on_minigame_complete()
diff --git a/inc/init/init.module.lua b/inc/init/init.module.lua
index 700caa5..d99472a 100644
--- a/inc/init/init.module.lua
+++ b/inc/init/init.module.lua
@@ -12,3 +12,5 @@ Input = {}
 Sprite = {}
 Audio = {}
 Focus = {}
+Day = {}
+Timer = {}
\ No newline at end of file
diff --git a/inc/screen/screen.toilet.lua b/inc/screen/screen.toilet.lua
index dae74c3..4c9b288 100644
--- a/inc/screen/screen.toilet.lua
+++ b/inc/screen/screen.toilet.lua
@@ -30,8 +30,7 @@ Screen.register({
     local bar_x = math.floor((sw - bar_w) / 2)
     local bar_h = 4
 
-    -- TODO: Add day counter
-    Print.text_center("day 1", cx, 10, Config.colors.white)
+    Print.text_center("day " .. Context.day_count, cx, 10, Config.colors.white)
 
     local narrative = "reflecting on my past and present\n...\nboth eventually flushed."
     local wrapped = UI.word_wrap(narrative, 38)
@@ -43,7 +42,7 @@ Screen.register({
 
     local m = Context.meters
     local max_val = Meter.get_max()
-    local decay_pct = Meter.get_timer_decay_percentage()
+    local decay_pct = Timer.get_decay_percentage()
     local decay_text = string.format("-%d%%", decay_pct)
     local combo_mult = Meter.get_combo_multiplier()
     local combo_pct = math.floor((combo_mult - 1) * 100)
diff --git a/inc/system/system.day.lua b/inc/system/system.day.lua
new file mode 100644
index 0000000..8b03d01
--- /dev/null
+++ b/inc/system/system.day.lua
@@ -0,0 +1,11 @@
+local _day_increase_handlers = {}
+
+function Day.increase()
+    Context.day_count = Context.day_count + 1
+    for _, handler in ipairs(_day_increase_handlers) do
+        handler()
+    end
+end
+function Day.register_handler(handler)
+    table.insert(_day_increase_handlers, handler)
+end
diff --git a/inc/system/system.main.lua b/inc/system/system.main.lua
index bed938a..bc9f315 100644
--- a/inc/system/system.main.lua
+++ b/inc/system/system.main.lua
@@ -19,11 +19,12 @@ function TIC()
   cls(Config.colors.black)
   local handler = Window.get_current_handler() -- Get handler from Window manager
   if handler then
-    handler()
+   handler()
   end
   Meter.update()
+  Timer.update()
   if Context.game_in_progress then
-    UI.draw_meters()
-    UI.draw_timer()
+   UI.draw_meters()
+   Timer.draw()
+  end
   end
-end
diff --git a/inc/system/system.timer.lua b/inc/system/system.timer.lua
new file mode 100644
index 0000000..005a607
--- /dev/null
+++ b/inc/system/system.timer.lua
@@ -0,0 +1,107 @@
+--- @section Timer
+
+local timer_duration = 1800
+local timer_decay_per_revolution = 20
+
+--- Gets initial timer values.
+--- @within Timer
+--- @return result table Initial timer values. </br>
+--- Fields: </br>
+--- * progress (number) Clock timer revolution progress (0 to 1).
+function Timer.get_initial()
+  return {
+    progress = 0,
+  }
+end
+
+--- Sets the number of frames for one full timer revolution.
+--- @within Timer
+--- @param frames number Frames per revolution.
+function Timer.set_duration(frames)
+  timer_duration = frames
+end
+
+--- Sets the decay amount applied to all meters per revolution.
+--- @within Timer
+--- @param amount number Amount to subtract from each meter.
+function Timer.set_decay(amount)
+  timer_decay_per_revolution = amount
+end
+
+--- Gets the timer decay as a percentage of the max meter value.
+--- @within Timer
+--- @return number The decay percentage per revolution.
+function Timer.get_decay_percentage()
+  return math.floor(timer_decay_per_revolution / Meter.get_max() * 100)
+end
+
+--- Updates the timer and handles revolution events.
+--- @within Timer
+function Timer.update()
+  if not Context or not Context.game_in_progress or not Context.meters or not Context.timer then return end
+  local m = Context.meters
+  local t = Context.timer
+  local in_minigame = string.find(Window.get_current_id(), "^minigame_") ~= nil
+
+  if not in_minigame then
+    t.progress = t.progress + (1 / timer_duration)
+    if t.progress >= 1 then
+      Day.increase()
+      t.progress = t.progress - 1
+      m.ism = math.max(0, m.ism - timer_decay_per_revolution)
+      m.wpm = math.max(0, m.wpm - timer_decay_per_revolution)
+      m.bm = math.max(0, m.bm - timer_decay_per_revolution)
+    end
+  end
+end
+
+--- Draws the clock timer indicator as a circular progress bar.
+--- @within Timer
+function Timer.draw()
+  if not Context or not Context.game_in_progress or not Context.meters or not Context.timer then return end
+  if Context.meters.hidden and not Context.stat_screen_active then return end
+
+  local cx = 10
+  local cy = 20
+  local r_outer = 5
+  local r_inner = 3
+  local progress = Context.timer.progress
+
+  local fg_color
+  if progress <= 0.25 then
+    fg_color = Config.colors.white
+  elseif progress <= 0.5 then
+    fg_color = Config.colors.light_blue
+  elseif progress <= 0.75 then
+    fg_color = Config.colors.blue
+  elseif progress <= 1 then
+    fg_color = Config.colors.red
+  end
+
+  local bg_color = Config.colors.dark_grey
+  local start_angle = -math.pi * 0.5
+  local progress_angle = progress * 2 * math.pi
+  local r_outer_sq = r_outer * r_outer
+  local r_inner_sq = r_inner * r_inner
+
+  for dy = -r_outer, r_outer do
+    for dx = -r_outer, r_outer do
+      local dist_sq = dx * dx + dy * dy
+      if dist_sq <= r_outer_sq and dist_sq > r_inner_sq then
+        local angle = math.atan(dy, dx)
+        local relative = angle - start_angle
+        if relative < 0 then relative = relative + 2 * math.pi end
+        if relative <= progress_angle then
+          pix(cx + dx, cy + dy, fg_color)
+        else
+          pix(cx + dx, cy + dy, bg_color)
+        end
+      end
+    end
+  end
+
+  local hand_angle = start_angle + progress_angle
+  local hand_x = math.floor(cx + math.cos(hand_angle) * (r_inner - 1) + 0.5)
+  local hand_y = math.floor(cy + math.sin(hand_angle) * (r_inner - 1) + 0.5)
+  line(cx, cy, hand_x, hand_y, Config.colors.white)
+end
diff --git a/inc/system/system.ui.lua b/inc/system/system.ui.lua
index 31a76ed..7f355c2 100644
--- a/inc/system/system.ui.lua
+++ b/inc/system/system.ui.lua
@@ -155,60 +155,6 @@ function UI.draw_decision_selector(decisions, selected_decision_index)
   end
 end
 
---- Draws the clock timer indicator as a circular progress bar in the top-left area.
---- Color transitions: white (0-50%), yellow (50-75%), red (75-100%).
---- @within UI
-function UI.draw_timer()
-  if not Context or not Context.game_in_progress or not Context.meters then return end
-  if Context.meters.hidden and not Context.stat_screen_active then return end
-
-  local m = Context.meters
-  local cx = 10
-  local cy = 20
-  local r_outer = 5
-  local r_inner = 3
-  local progress = m.timer_progress
-
-  local fg_color
-  if progress <= 0.25 then
-    fg_color = Config.colors.white
-  elseif progress <= 0.5 then
-    fg_color = Config.colors.light_blue
-  elseif progress <= 0.75 then
-    fg_color = Config.colors.blue
-  elseif progress <= 1 then
-    fg_color = Config.colors.red
-  end
-
-
-  local bg_color = Config.colors.dark_grey
-  local start_angle = -math.pi * 0.5
-  local progress_angle = progress * 2 * math.pi
-  local r_outer_sq = r_outer * r_outer
-  local r_inner_sq = r_inner * r_inner
-
-  for dy = -r_outer, r_outer do
-    for dx = -r_outer, r_outer do
-      local dist_sq = dx * dx + dy * dy
-      if dist_sq <= r_outer_sq and dist_sq > r_inner_sq then
-        local angle = math.atan(dy, dx)
-        local relative = angle - start_angle
-        if relative < 0 then relative = relative + 2 * math.pi end
-        if relative <= progress_angle then
-          pix(cx + dx, cy + dy, fg_color)
-        else
-          pix(cx + dx, cy + dy, bg_color)
-        end
-      end
-    end
-  end
-
-  local hand_angle = start_angle + progress_angle
-  local hand_x = math.floor(cx + math.cos(hand_angle) * (r_inner - 1) + 0.5)
-  local hand_y = math.floor(cy + math.sin(hand_angle) * (r_inner - 1) + 0.5)
-  line(cx, cy, hand_x, hand_y, Config.colors.white)
-end
-
 --- Draws meters.
 --- @within UI
 function UI.draw_meters()