diff --git a/include/config/overworld.h b/include/config/overworld.h
index cac35413ded0..34880644211d 100644
--- a/include/config/overworld.h
+++ b/include/config/overworld.h
@@ -6,6 +6,7 @@
 
 // Other settings
 #define OW_POISON_DAMAGE            GEN_LATEST // In Gen4, Pokémon no longer faint from Poison in the overworld. In Gen5+, they no longer take damage at all.
+#define OW_TIMES_OF_DAY             GEN_LATEST // Different generations have the times of day change at different times
 
 // PC settings
 #define OW_PC_PRESS_B               GEN_LATEST // In Gen4, pressing B when holding a Pokémon is equivalent to placing it. In Gen3, it gives the "You're holding a Pokémon!" error.
diff --git a/include/rtc.h b/include/rtc.h
index d94beafcdce4..9882d702b6fb 100644
--- a/include/rtc.h
+++ b/include/rtc.h
@@ -17,21 +17,75 @@
 
 #define RTC_ERR_FLAG_MASK      0x0FF0
 
-#define MORNING_EVO_HOUR_BEGIN 6
-#define MORNING_EVO_HOUR_END   10
+//Morning and evening don't exist in Gen 3
+#if OW_TIMES_OF_DAY == GEN_3
+    #define MORNING_HOUR_BEGIN 0
+    #define MORNING_HOUR_END   0
 
-#define DAY_EVO_HOUR_BEGIN     10
-#define DAY_EVO_HOUR_END       19
+    #define DAY_HOUR_BEGIN     12
+    #define DAY_HOUR_END       HOURS_PER_DAY
 
-#define DUSK_EVO_HOUR_BEGIN    19
-#define DUSK_EVO_HOUR_END      20
+    #define EVENING_HOUR_BEGIN 0
+    #define EVENING_HOUR_END   0
 
-#define NIGHT_EVO_HOUR_BEGIN   20
-#define NIGHT_EVO_HOUR_END     6
+    #define NIGHT_HOUR_BEGIN   0
+    #define NIGHT_HOUR_END     12
+//Evening doesn't exist in Gen 4
+#elif OW_TIMES_OF_DAY == GEN_4
+    #define MORNING_HOUR_BEGIN 4
+    #define MORNING_HOUR_END   10
+
+    #define DAY_HOUR_BEGIN     10
+    #define DAY_HOUR_END       20
+
+    #define EVENING_HOUR_BEGIN 0
+    #define EVENING_HOUR_END   0
+
+    #define NIGHT_HOUR_BEGIN   20
+    #define NIGHT_HOUR_END     4
+//Gen 5 currently not included as the seasons change the times of day
+#elif OW_TIMES_OF_DAY <= GEN_6
+    #define MORNING_HOUR_BEGIN 4
+    #define MORNING_HOUR_END   11
+
+    #define DAY_HOUR_BEGIN     11
+    #define DAY_HOUR_END       18
+
+    #define EVENING_HOUR_BEGIN 18
+    #define EVENING_HOUR_END   21
+
+    #define NIGHT_HOUR_BEGIN   21
+    #define NIGHT_HOUR_END     4
+//These are the Sun/Ultra Sun times
+#elif OW_TIMES_OF_DAY == GEN_7
+    #define MORNING_HOUR_BEGIN 6
+    #define MORNING_HOUR_END   10
+
+    #define DAY_HOUR_BEGIN     10
+    #define DAY_HOUR_END       17
+
+    #define EVENING_HOUR_BEGIN 17
+    #define EVENING_HOUR_END   18
+
+    #define NIGHT_HOUR_BEGIN   18
+    #define NIGHT_HOUR_END     6
+#elif OW_TIMES_OF_DAY >= GEN_8
+    #define MORNING_HOUR_BEGIN 6
+    #define MORNING_HOUR_END   10
+
+    #define DAY_HOUR_BEGIN     10
+    #define DAY_HOUR_END       19
+
+    #define EVENING_HOUR_BEGIN 19
+    #define EVENING_HOUR_END   20
+
+    #define NIGHT_HOUR_BEGIN   20
+    #define NIGHT_HOUR_END     6
+#endif
 
 #define TIME_MORNING           0
 #define TIME_DAY               1
-#define TIME_DUSK              2
+#define TIME_EVENING           2
 #define TIME_NIGHT             3
 
 extern struct Time gLocalTime;
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index 8de129f474e6..780f630ed82e 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -14858,7 +14858,7 @@ static void Cmd_handleballthrow(void)
                     ballMultiplier = 400;
                 break;
             case ITEM_DUSK_BALL:
-                if ((GetTimeOfDay() == TIME_DUSK || GetTimeOfDay() == TIME_NIGHT) || gMapHeader.cave || gMapHeader.mapType == MAP_TYPE_UNDERGROUND)
+                if ((GetTimeOfDay() == TIME_EVENING || GetTimeOfDay() == TIME_NIGHT) || gMapHeader.cave || gMapHeader.mapType == MAP_TYPE_UNDERGROUND)
                     ballMultiplier = (B_DUSK_BALL_MODIFIER >= GEN_7 ? 300 : 350);
                 break;
             case ITEM_QUICK_BALL:
diff --git a/src/pokemon.c b/src/pokemon.c
index 97577efbb06f..a9c22ae8e708 100644
--- a/src/pokemon.c
+++ b/src/pokemon.c
@@ -7076,7 +7076,7 @@ u16 GetEvolutionTargetSpecies(struct Pokemon *mon, u8 mode, u16 evolutionItem, s
                 }
                 break;
             case EVO_LEVEL_DUSK:
-                if (GetTimeOfDay() == TIME_DUSK && gEvolutionTable[species][i].param <= level)
+                if (GetTimeOfDay() == TIME_EVENING && gEvolutionTable[species][i].param <= level)
                     targetSpecies = gEvolutionTable[species][i].targetSpecies;
                 break;
             case EVO_LEVEL:
diff --git a/src/rtc.c b/src/rtc.c
index d6f5377d9831..64e6734552ce 100644
--- a/src/rtc.c
+++ b/src/rtc.c
@@ -304,11 +304,11 @@ bool8 IsBetweenHours(s32 hours, s32 begin, s32 end)
 u8 GetTimeOfDay(void)
 {
     RtcCalcLocalTime();
-    if (IsBetweenHours(gLocalTime.hours, MORNING_EVO_HOUR_BEGIN, MORNING_EVO_HOUR_END))
+    if (IsBetweenHours(gLocalTime.hours, MORNING_HOUR_BEGIN, MORNING_HOUR_END))
         return TIME_MORNING;
-    else if (IsBetweenHours(gLocalTime.hours, DUSK_EVO_HOUR_BEGIN, DUSK_EVO_HOUR_END))
-        return TIME_DUSK;
-    else if (IsBetweenHours(gLocalTime.hours, NIGHT_EVO_HOUR_BEGIN, NIGHT_EVO_HOUR_END))
+    else if (IsBetweenHours(gLocalTime.hours, EVENING_HOUR_BEGIN, EVENING_HOUR_END))
+        return TIME_EVENING;
+    else if (IsBetweenHours(gLocalTime.hours, NIGHT_HOUR_BEGIN, NIGHT_HOUR_END))
         return TIME_NIGHT;
     return TIME_DAY;
 }