diff --git a/Makefile b/Makefile
index 05c06ad7..a8e814c3 100755
--- a/Makefile
+++ b/Makefile
@@ -165,6 +165,13 @@ CFLAGS += -DOSTYPE=\"$(OSTYPE)\" -DARCH=\"$(ARCH)\"
 
 # ----------
 
+# https://reproducible-builds.org/specs/source-date-epoch/
+ifdef SOURCE_DATE_EPOCH
+CFLAGS += -DBUILD_DATE=\"$(shell date --utc --date="@${SOURCE_DATE_EPOCH}" +"%b %_d %Y" | sed -e 's/ /\\ /g')\"
+endif
+
+# ----------
+
 # Systemwide installation
 ifeq ($(WITH_SYSTEMWIDE),yes)
 CFLAGS += -DSYSTEMWIDE
diff --git a/src/common/header/common.h b/src/common/header/common.h
index 8a518863..ea84285e 100644
--- a/src/common/header/common.h
+++ b/src/common/header/common.h
@@ -44,6 +44,10 @@
 #error ARCH should be defined by the build system
 #endif
 
+#ifndef BUILD_DATE
+#define BUILD_DATE __DATE__
+#endif
+
 #ifdef _WIN32
  #define CFGDIR "YamagiQ2"
 #else
diff --git a/src/common/misc.c b/src/common/misc.c
index 98a90e51..7589b159 100644
--- a/src/common/misc.c
+++ b/src/common/misc.c
@@ -241,7 +241,7 @@ Qcommon_Init(int argc, char **argv)
 	dedicated = Cvar_Get("dedicated", "0", CVAR_NOSET);
 #endif
 
-	s = va("%s %s %s %s", YQ2VERSION, ARCH, __DATE__, OSTYPE);
+	s = va("%s %s %s %s", YQ2VERSION, ARCH, BUILD_DATE, OSTYPE);
 	Cvar_Get("version", s, CVAR_SERVERINFO | CVAR_NOSET);
 
 	if (dedicated->value)
diff --git a/src/game/savegame/savegame.c b/src/game/savegame/savegame.c
index 1d1e1339..6e011a4d 100644
--- a/src/game/savegame/savegame.c
+++ b/src/game/savegame/savegame.c
@@ -207,7 +207,7 @@ void
 InitGame(void)
 {
 	gi.dprintf("Game is starting up.\n");
-	gi.dprintf("Game is %s built on %s.\n", GAMEVERSION, __DATE__);
+	gi.dprintf("Game is %s built on %s.\n", GAMEVERSION, BUILD_DATE);
 
 	gun_x = gi.cvar("gun_x", "0", 0);
 	gun_y = gi.cvar("gun_y", "0", 0);
@@ -223,7 +223,7 @@ InitGame(void)
 	/* latched vars */
 	sv_cheats = gi.cvar("cheats", "0", CVAR_SERVERINFO | CVAR_LATCH);
 	gi.cvar("gamename", GAMEVERSION, CVAR_SERVERINFO | CVAR_LATCH);
-	gi.cvar("gamedate", __DATE__, CVAR_SERVERINFO | CVAR_LATCH);
+	gi.cvar("gamedate", BUILD_DATE, CVAR_SERVERINFO | CVAR_LATCH);
 	maxclients = gi.cvar("maxclients", "4", CVAR_SERVERINFO | CVAR_LATCH);
 	maxspectators = gi.cvar("maxspectators", "4", CVAR_SERVERINFO);
 	deathmatch = gi.cvar("deathmatch", "0", CVAR_LATCH);