diff --git a/src/company_base.h b/src/company_base.h
index 814665777b..490dc85b19 100644
--- a/src/company_base.h
+++ b/src/company_base.h
@@ -92,6 +92,7 @@ struct CompanyProperties {
 	TileIndex last_build_coordinate; ///< Coordinate of the last build thing by this company.
 
 	TimerGameEconomy::Year inaugurated_year; ///< Economy year of starting the company.
+    TimerGameCalendar::Year inaugurated_year_calendar; ///< Calendar year of starting the company. Used for when we need to display an actual Inaguration Year while in Wallclock mode.
 
 	uint8_t months_empty = 0; ///< NOSAVE: Number of months this company has not had a client in multiplayer.
 	uint8_t months_of_bankruptcy;       ///< Number of months that the company is unable to pay its debts
@@ -125,7 +126,7 @@ struct CompanyProperties {
 		: name_2(0), name_1(0), president_name_1(0), president_name_2(0),
 		  face(0), money(0), money_fraction(0), current_loan(0), max_loan(COMPANY_MAX_LOAN_DEFAULT),
 		  colour(COLOUR_BEGIN), block_preview(0), location_of_HQ(0), last_build_coordinate(0), inaugurated_year(0),
-		  months_of_bankruptcy(0), bankrupt_asked(0), bankrupt_timeout(0), bankrupt_value(0),
+		  inaugurated_year_calendar(0), months_of_bankruptcy(0), bankrupt_asked(0), bankrupt_timeout(0), bankrupt_value(0),
 		  terraform_limit(0), clear_limit(0), tree_limit(0), build_object_limit(0), is_ai(false), engine_renew_list(nullptr) {}
 };
 
diff --git a/src/company_cmd.cpp b/src/company_cmd.cpp
index 74ad2893f4..18de2b3934 100644
--- a/src/company_cmd.cpp
+++ b/src/company_cmd.cpp
@@ -608,6 +608,7 @@ Company *DoStartupNewCompany(bool is_ai, CompanyID company = INVALID_COMPANY)
 	c->avail_railtypes = GetCompanyRailTypes(c->index);
 	c->avail_roadtypes = GetCompanyRoadTypes(c->index);
 	c->inaugurated_year = TimerGameEconomy::year;
+    c->inaugurated_year_calendar = TimerGameCalendar::year;
 
 	/* If starting a player company in singleplayer and a favorite company manager face is selected, choose it. Otherwise, use a random face.
 	 * In a network game, we'll choose the favorite face later in CmdCompanyCtrl to sync it to all clients. */
diff --git a/src/company_gui.cpp b/src/company_gui.cpp
index c68e9d26e0..7324d4fa8f 100644
--- a/src/company_gui.cpp
+++ b/src/company_gui.cpp
@@ -2401,8 +2401,8 @@ struct CompanyWindow : Window
 				break;
 
 			case WID_C_DESC_INAUGURATION:
-				SetDParam(0, Company::Get((CompanyID)this->window_number)->inaugurated_year);
-				break;
+                SetDParam(0, Company::Get((CompanyID) this->window_number)->inaugurated_year_calendar);
+                break;
 
 			case WID_C_DESC_COMPANY_VALUE:
 				SetDParam(0, CalculateCompanyValue(Company::Get((CompanyID)this->window_number)));