diff --git a/src/timer/timer_game_economy.cpp b/src/timer/timer_game_economy.cpp
index 43f4571a02..cd78aa74af 100644
--- a/src/timer/timer_game_economy.cpp
+++ b/src/timer/timer_game_economy.cpp
@@ -52,7 +52,7 @@ TimerGameEconomy::DateFract TimerGameEconomy::date_fract = {};
 	TimerGameEconomy::YearMonthDay ymd;
 	ymd.year = date.base() / EconomyTime::DAYS_IN_ECONOMY_YEAR;
 	ymd.month = (date.base() % EconomyTime::DAYS_IN_ECONOMY_YEAR) / EconomyTime::DAYS_IN_ECONOMY_MONTH;
-	ymd.day = date.base() % EconomyTime::DAYS_IN_ECONOMY_MONTH;
+	ymd.day = (date.base() % EconomyTime::DAYS_IN_ECONOMY_MONTH) + 1;
 	return ymd;
 }