diff --git a/src/newgrf.cpp b/src/newgrf.cpp
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -6520,8 +6520,7 @@ bool GetGlobalVariable(byte param, uint3
 			return true;
 
 		case 0x02: { // detailed date information: month of year (bit 0-7), day of month (bit 8-12), leap year (bit 15), day of year (bit 16-24)
-			TimerGameCalendar::YearMonthDay ymd;
-			TimerGameCalendar::ConvertDateToYMD(TimerGameCalendar::date, &ymd);
+			TimerGameCalendar::YearMonthDay ymd = TimerGameCalendar::ConvertDateToYMD(TimerGameCalendar::date);
 			TimerGameCalendar::Date start_of_year = TimerGameCalendar::ConvertYMDToDate(ymd.year, 0, 1);
 			*value = ymd.month | (ymd.day - 1) << 8 | (TimerGameCalendar::IsLeapYear(ymd.year) ? 1 << 15 : 0) | (TimerGameCalendar::date - start_of_year).base() << 16;
 			return true;