diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6ef4fa3fdf..0add42130c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -117,7 +117,6 @@ add_files(
     currency.h
     date_gui.cpp
     date_gui.h
-    date_type.h
     debug.cpp
     debug.h
     dedicated.cpp
diff --git a/src/date_gui.cpp b/src/date_gui.cpp
index 2e3a43c356..9d94e154da 100644
--- a/src/date_gui.cpp
+++ b/src/date_gui.cpp
@@ -13,7 +13,6 @@
 #include "window_func.h"
 #include "window_gui.h"
 #include "date_gui.h"
-#include "date_type.h"
 #include "core/geometry_func.hpp"
 
 #include "widgets/dropdown_type.h"
diff --git a/src/date_type.h b/src/date_type.h
deleted file mode 100644
index 5688159c84..0000000000
--- a/src/date_type.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * This file is part of OpenTTD.
- * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
- * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/** @file date_type.h Types related to the dates in OpenTTD. */
-
-#ifndef DATE_TYPE_H
-#define DATE_TYPE_H
-
-#include "timer/timer_game_calendar.h"
-
-
-#endif /* DATE_TYPE_H */
diff --git a/src/graph_gui.cpp b/src/graph_gui.cpp
index e6aeeb22ff..57f1e80949 100644
--- a/src/graph_gui.cpp
+++ b/src/graph_gui.cpp
@@ -16,7 +16,6 @@
 #include "cargotype.h"
 #include "strings_func.h"
 #include "window_func.h"
-#include "date_type.h"
 #include "gfx_func.h"
 #include "core/geometry_func.hpp"
 #include "currency.h"
diff --git a/src/linkgraph/linkgraph.h b/src/linkgraph/linkgraph.h
index 7f9e1e352d..57fe6a3fb3 100644
--- a/src/linkgraph/linkgraph.h
+++ b/src/linkgraph/linkgraph.h
@@ -13,7 +13,6 @@
 #include "../core/pool_type.hpp"
 #include "../station_base.h"
 #include "../cargotype.h"
-#include "../date_type.h"
 #include "../timer/timer_game_calendar.h"
 #include "../saveload/saveload.h"
 #include "linkgraph_type.h"
diff --git a/src/network/network_base.h b/src/network/network_base.h
index 44ad10af1b..3557cb45e4 100644
--- a/src/network/network_base.h
+++ b/src/network/network_base.h
@@ -14,7 +14,6 @@
 #include "core/address.h"
 #include "../core/pool_type.hpp"
 #include "../company_type.h"
-#include "../date_type.h"
 #include "../timer/timer_game_calendar.h"
 
 /** Type for the pool with client information. */
diff --git a/src/newgrf_airport.h b/src/newgrf_airport.h
index 944c9cf19c..e09d16e046 100644
--- a/src/newgrf_airport.h
+++ b/src/newgrf_airport.h
@@ -11,7 +11,6 @@
 #define NEWGRF_AIRPORT_H
 
 #include "airport.h"
-#include "date_type.h"
 #include "timer/timer_game_calendar.h"
 #include "newgrf_class.h"
 #include "newgrf_commons.h"
diff --git a/src/newgrf_profiling.h b/src/newgrf_profiling.h
index d67f069377..629a42ea0b 100644
--- a/src/newgrf_profiling.h
+++ b/src/newgrf_profiling.h
@@ -11,7 +11,6 @@
 #define NEWGRF_PROFILING_H
 
 #include "stdafx.h"
-#include "date_type.h"
 #include "timer/timer_game_calendar.h"
 #include "newgrf.h"
 #include "newgrf_callbacks.h"
diff --git a/src/newgrf_text.cpp b/src/newgrf_text.cpp
index d979573dbb..a4b984ca88 100644
--- a/src/newgrf_text.cpp
+++ b/src/newgrf_text.cpp
@@ -24,7 +24,6 @@
 #include "newgrf_cargo.h"
 #include "string_func.h"
 #include "timer/timer_game_calendar.h"
-#include "date_type.h"
 #include "debug.h"
 #include "core/alloc_type.hpp"
 #include "language.h"
diff --git a/src/order_base.h b/src/order_base.h
index 9671b96cac..89d00a3d48 100644
--- a/src/order_base.h
+++ b/src/order_base.h
@@ -18,7 +18,6 @@
 #include "station_type.h"
 #include "vehicle_type.h"
 #include "timer/timer_game_tick.h"
-#include "date_type.h"
 #include "saveload/saveload.h"
 
 typedef Pool<Order, OrderID, 256, 0xFF0000> OrderPool;
diff --git a/src/rail.h b/src/rail.h
index 6fbcaf3bf1..4c46073ccc 100644
--- a/src/rail.h
+++ b/src/rail.h
@@ -17,7 +17,6 @@
 #include "economy_func.h"
 #include "slope_type.h"
 #include "strings_type.h"
-#include "date_type.h"
 #include "timer/timer_game_calendar.h"
 #include "signal_type.h"
 #include "settings_type.h"
diff --git a/src/saveload/misc_sl.cpp b/src/saveload/misc_sl.cpp
index af20e34e83..d0c04daa05 100644
--- a/src/saveload/misc_sl.cpp
+++ b/src/saveload/misc_sl.cpp
@@ -20,7 +20,6 @@
 #include "../gfx_func.h"
 #include "../core/random_func.hpp"
 #include "../fios.h"
-#include "../date_type.h"
 #include "../timer/timer.h"
 #include "../timer/timer_game_tick.h"
 
diff --git a/src/script/api/script_date.hpp b/src/script/api/script_date.hpp
index 01ef5d3dc2..2e108a74c8 100644
--- a/src/script/api/script_date.hpp
+++ b/src/script/api/script_date.hpp
@@ -12,7 +12,6 @@
 
 #include "script_object.hpp"
 #include "timer/timer_game_calendar.h"
-#include "../../date_type.h"
 
 /**
  * Class that handles all date related (calculation) functions.
diff --git a/src/settings.cpp b/src/settings.cpp
index 3c18f4ec32..cfd6dedba0 100644
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -45,7 +45,6 @@
 #include "fios.h"
 #include "fileio_func.h"
 #include "settings_cmd.h"
-#include "date_type.h"
 
 #include "table/strings.h"
 
diff --git a/src/sortlist_type.h b/src/sortlist_type.h
index 4c2056d2d8..feb02dce53 100644
--- a/src/sortlist_type.h
+++ b/src/sortlist_type.h
@@ -13,7 +13,6 @@
 #include "core/enum_type.hpp"
 #include "core/bitmath_func.hpp"
 #include "core/mem_func.hpp"
-#include "date_type.h"
 #include "timer/timer_game_tick.h"
 
 /** Flags of the sort list. */
diff --git a/src/statusbar_gui.cpp b/src/statusbar_gui.cpp
index 782d998b89..2719fef18d 100644
--- a/src/statusbar_gui.cpp
+++ b/src/statusbar_gui.cpp
@@ -25,7 +25,6 @@
 #include "toolbar_gui.h"
 #include "core/geometry_func.hpp"
 #include "zoom_func.h"
-#include "date_type.h"
 #include "timer/timer.h"
 #include "timer/timer_game_calendar.h"
 #include "timer/timer_window.h"
diff --git a/src/story_cmd.h b/src/story_cmd.h
index d71efa6383..155ffe0031 100644
--- a/src/story_cmd.h
+++ b/src/story_cmd.h
@@ -12,7 +12,6 @@
 
 #include "command_type.h"
 #include "company_type.h"
-#include "date_type.h"
 #include "story_type.h"
 #include "vehicle_type.h"
 
diff --git a/src/timetable.h b/src/timetable.h
index cbc482a825..597d391da7 100644
--- a/src/timetable.h
+++ b/src/timetable.h
@@ -11,7 +11,6 @@
 #define TIMETABLE_H
 
 #include "timer/timer_game_tick.h"
-#include "date_type.h"
 #include "timer/timer_game_calendar.h"
 #include "vehicle_type.h"
 
diff --git a/src/town.h b/src/town.h
index b20e3cc30d..60ec9deae5 100644
--- a/src/town.h
+++ b/src/town.h
@@ -11,7 +11,6 @@
 #define TOWN_H
 
 #include "viewport_type.h"
-#include "date_type.h"
 #include "timer/timer_game_tick.h"
 #include "town_map.h"
 #include "subsidy_type.h"
diff --git a/src/vehicle_func.h b/src/vehicle_func.h
index da225d844b..06268b4abb 100644
--- a/src/vehicle_func.h
+++ b/src/vehicle_func.h
@@ -11,7 +11,6 @@
 #define VEHICLE_FUNC_H
 
 #include "gfx_type.h"
-#include "date_type.h"
 #include "direction_type.h"
 #include "command_type.h"
 #include "vehicle_type.h"