diff --git a/assets/mods/basegame/items/itemid.csv b/assets/mods/basegame/items/itemid.csv
index f002e82e5..c85baee9e 100644
--- a/assets/mods/basegame/items/itemid.csv
+++ b/assets/mods/basegame/items/itemid.csv
@@ -8,6 +8,7 @@ id;classname
 8;net.torvald.terrarum.modulebasegame.gameitems.ItemLogicSignalEmitter
 9;net.torvald.terrarum.modulebasegame.gameitems.WireCutterAll
 10;net.torvald.terrarum.modulebasegame.gameitems.ItemTypewriter
+11;net.torvald.terrarum.modulebasegame.gameitems.ItemWallCalendar
 
 256;net.torvald.terrarum.modulebasegame.gameitems.ItemSwingingDoorOak
 257;net.torvald.terrarum.modulebasegame.gameitems.ItemSwingingDoorEbony
diff --git a/assets/mods/basegame/sprites/fixtures/calendar.tga b/assets/mods/basegame/sprites/fixtures/calendar.tga
new file mode 100644
index 000000000..3ac31b2dc
--- /dev/null
+++ b/assets/mods/basegame/sprites/fixtures/calendar.tga
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:511edae339c321a9f0e6b11a25a1df6d0dff2de0893ebc94c3e990a2be7aa3bc
+size 1042
diff --git a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
index ec9607ba0..4062e1ed2 100644
--- a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
+++ b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
@@ -1367,7 +1367,7 @@ open class ActorWithBody : Actor {
         //println("-> $stairHeight")
 
                // edge-detect mode
-        return if (yheight == 0) hitFloor.toInt() * 2 to stairHeight
+        return if (yheight == 0) hitFloor.toInt(1) to stairHeight
                // not an edge-detect && no collision
                else if (stairHeight == 0) 0 to 0
                // there was collision and stairHeight <= AUTO_CLIMB_STRIDE
diff --git a/src/net/torvald/terrarum/gameworld/WorldTime.kt b/src/net/torvald/terrarum/gameworld/WorldTime.kt
index 4bd2da5c3..fb5e11a14 100644
--- a/src/net/torvald/terrarum/gameworld/WorldTime.kt
+++ b/src/net/torvald/terrarum/gameworld/WorldTime.kt
@@ -58,7 +58,7 @@ import kotlin.math.sin
 class WorldTime(initTime: Long = 0L) {
 
     /** It is not recommended to directly modify the TIME_T. Use provided methods instead. */
-    var TIME_T = 0L // Epoch: Year 125 Spring 1st, 0h00:00 (Mondag) // 125-01-01
+    var TIME_T = 0L // Epoch: Year 1 Spring 1st, 0h00:00 (Mondag) // 0001-01-01
 
     init {
         TIME_T = initTime
@@ -181,7 +181,7 @@ class WorldTime(initTime: Long = 0L) {
 
         const val MONTH_LENGTH = 30 // ingame calendar specific
 
-        const val EPOCH_YEAR = 125
+        const val EPOCH_YEAR = 1
 
         val YEAR_SECONDS = DAY_LENGTH * YEAR_DAYS
 
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureTypewriter.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureTypewriter.kt
index 4405e1ba6..c5392daca 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureTypewriter.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureTypewriter.kt
@@ -24,7 +24,7 @@ class FixtureTypewriter : FixtureBase {
     // constructor used when the game loads from the savefile
     constructor() : super(
             BlockBox(BlockBox.NO_COLLISION, 1, 1),
-            nameFun = { Lang["ITEM_TYPEWRITER"] }
+            nameFun = { Lang["GAME_ITEM_TYPEWRITER"] }
     ) {
 
         density = 2000.0
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureWallCalendar.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureWallCalendar.kt
new file mode 100644
index 000000000..3a7903356
--- /dev/null
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureWallCalendar.kt
@@ -0,0 +1,31 @@
+package net.torvald.terrarum.modulebasegame.gameactors
+
+import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
+import net.torvald.terrarum.gameactors.AVKey
+import net.torvald.terrarum.langpack.Lang
+import net.torvald.terrarum.modulebasegame.gameitems.FixtureItemBase
+import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
+
+/**
+ * Created by minjaesong on 2023-08-08.
+ */
+class FixtureWallCalendar : FixtureBase {
+
+    constructor() : super(
+            BlockBox(BlockBox.NO_COLLISION, 1, 1),
+            nameFun = { Lang["GAME_ITEM_CALENDAR"] }
+    ) {
+        val itemImage = FixtureItemBase.getItemImageFromSingleImage("basegame", "sprites/fixtures/calendar.tga")
+
+        density = 600.0
+        setHitboxDimension(TILE_SIZE, TILE_SIZE, 0, 1)
+
+        makeNewSprite(TextureRegionPack(itemImage.texture, TILE_SIZE, TILE_SIZE)).let {
+            it.setRowsAndFrames(1,1)
+        }
+
+        actorValue[AVKey.BASEMASS] = 1.0
+    }
+
+
+}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/ItemTypewriter.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/ItemTypewriter.kt
index 1a0bc2b1d..9cc7584e9 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameitems/ItemTypewriter.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/ItemTypewriter.kt
@@ -11,7 +11,7 @@ import net.torvald.terrarum.modulebasegame.gameactors.FixtureTikiTorch
 class ItemTypewriter(originalID: ItemID) : FixtureItemBase(originalID, "net.torvald.terrarum.modulebasegame.gameactors.FixtureTypewriter") {
 
     override var dynamicID: ItemID = originalID
-    override val originalName = "ITEM_TYPEWRITER"
+    override val originalName = "GAME_ITEM_TYPEWRITER"
     override var baseMass = FixtureTikiTorch.MASS
     override var stackable = true
     override var inventoryCategory = Category.MISC
diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/ItemWallCalendar.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/ItemWallCalendar.kt
new file mode 100644
index 000000000..5a612c124
--- /dev/null
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/ItemWallCalendar.kt
@@ -0,0 +1,29 @@
+package net.torvald.terrarum.modulebasegame.gameitems
+
+import com.badlogic.gdx.graphics.g2d.TextureRegion
+import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
+import net.torvald.terrarum.gameitems.ItemID
+
+/**
+ * Created by minjaesong on 2023-08-08.
+ */
+class ItemWallCalendar(originalID: ItemID) : FixtureItemBase(originalID, "net.torvald.terrarum.modulebasegame.gameactors.FixtureWallCalendar") {
+
+    override var dynamicID: ItemID = originalID
+    override val originalName = "GAME_ITEM_CALENDAR"
+    override var baseMass = 1.0
+    override var stackable = true
+    override var inventoryCategory = Category.MISC
+    override val isUnique = false
+    override val isDynamic = false
+    override val materialId = ""
+    override val itemImage: TextureRegion
+        get() = getItemImageFromSingleImage("basegame", "sprites/fixtures/calendar.tga")
+
+    override var baseToolSize: Double? = baseMass
+
+    init {
+        equipPosition = EquipPosition.HAND_GRIP
+    }
+
+}
\ No newline at end of file