diff --git a/ds3231.hpp b/ds3231.hpp
index f7f0c6c..9557c6c 100644
--- a/ds3231.hpp
+++ b/ds3231.hpp
@@ -2,6 +2,8 @@
 
 #include "../clock.hpp"
 
+#include <stddef.h>
+
 #include "../i2c/i2c.hpp"
 #include "../type/type.hpp"
 
@@ -85,7 +87,19 @@ class DS3231 {
 		return dateTime;
 	}
 
-	static void setDate(const Date &date) {}
+	static void setDate(const Date &date)
+	{
+		detail::TimeReg timeReg;
+		timeReg.setYear(date.year);
+		timeReg.setMonth(date.month);
+		timeReg.setDate(date.day);
+		if constexpr (SetDayOfWeek) {
+			timeReg.setDay(calcDayOfWeek(date.year, date.month, date.day) + 1);
+		}
+
+		constexpr auto DATE_OFFSET = offsetof(detail::TimeReg, day);
+		writePartialRegister<TIME_REG_ADDR, DATE_OFFSET>(timeReg);
+	}
 	static void setTime(const Time &time) {}
 	static void setDateTime(const DateTime &dateTime) {}