6 files changed, 16 insertions, 14 deletions
diff --git a/arm9/asm/unk_02028980.s b/arm9/asm/unk_02028980.s
index 8c9178e7..664e39e7 100644
--- a/arm9/asm/unk_02028980.s
+++ b/arm9/asm/unk_02028980.s
@@ -163,10 +163,10 @@ _02028A30:
 	lsr r0, r0, #0x1d
 	str r0, [sp, #0x1c]
 	add r0, sp, #0x0
-	bl FUN_02012710
+	bl GF_RTC_GetDayOfYear
 	add r4, r0, #0x0
 	add r0, sp, #0x10
-	bl FUN_02012710
+	bl GF_RTC_GetDayOfYear
 	ldr r2, [sp, #0x4]
 	sub r0, r4, r0
 	cmp r2, #0xc
diff --git a/arm9/asm/unk_02034FE4.s b/arm9/asm/unk_02034FE4.s
index 128cfb9d..81135415 100644
--- a/arm9/asm/unk_02034FE4.s
+++ b/arm9/asm/unk_02034FE4.s
@@ -136,7 +136,7 @@ FUN_02034FE4: ; 0x02034FE4
 	bl Sav2_SysInfo_RTC_get
 	add r6, r0, #0x0
 	add r0, r6, #0x4
-	bl FUN_02012710
+	bl GF_RTC_GetDayOfYear
 	sub r5, r0, #0x1
 	bmi _0203500C
 	ldr r0, _02035060 ; =0x0000016E
diff --git a/arm9/asm/unk_020377F0.s b/arm9/asm/unk_020377F0.s
index c501c604..9c2132bf 100644
--- a/arm9/asm/unk_020377F0.s
+++ b/arm9/asm/unk_020377F0.s
@@ -2417,7 +2417,7 @@ _02038956:
 	ldr r1, [r5, #0x8]
 	ldr r2, [sp, #0x4]
 	add r3, r6, #0x0
-	bl FUN_020127C0
+	bl GF_RTC_TimeDelta
 	mov r2, #0x3c
 	mov r3, #0x0
 	bl _ll_sdiv
diff --git a/arm9/asm/unk_0204B9EC.s b/arm9/asm/unk_0204B9EC.s
index e8d19327..2511f182 100644
--- a/arm9/asm/unk_0204B9EC.s
+++ b/arm9/asm/unk_0204B9EC.s
@@ -44,7 +44,7 @@ FUN_0204BA1C: ; 0x0204BA1C
 	add r2, r0, #0x0
 	ldr r0, [r1, #0x40]
 	ldr r1, [r1, #0x44]
-	bl FUN_020127C0
+	bl GF_RTC_TimeDelta
 	mov r2, #0xfa
 	mov r3, #0x0
 	lsl r2, r2, #0x2
diff --git a/arm9/global.inc b/arm9/global.inc
index f94670a1..d4d6b78c 100644
--- a/arm9/global.inc
+++ b/arm9/global.inc
@@ -805,11 +805,11 @@
 .extern GF_RTC_CopyDate
 .extern GF_RTC_TimeToSec
 .extern GF_RTC_DateTimeToSec
-.extern FUN_02012710
+.extern GF_RTC_GetDayOfYear
 .extern IsNighttime
 .extern GF_RTC_GetTimeOfDay
 .extern GF_RTC_GetTimeOfDayByHour
-.extern FUN_020127C0
+.extern GF_RTC_TimeDelta
 .extern ListMenuItems_ctor
 .extern ListMenuItems_dtor
 .extern ListMenuItems_AppendFromMsgData
diff --git a/arm9/src/gf_rtc.c b/arm9/src/gf_rtc.c
index 9a1c1393..02fa735f 100644
--- a/arm9/src/gf_rtc.c
+++ b/arm9/src/gf_rtc.c
@@ -17,6 +17,8 @@ typedef struct GF_RTC_Work
 
 GF_RTC_Work sGFRTCWork;
 
+#define MAX_SECONDS     (3155759999ll)
+
 void GF_RTC_GetDateTime(GF_RTC_Work * work);
 
 THUMB_FUNC void GF_InitRTCWork(void)
@@ -95,7 +97,7 @@ static inline BOOL IsLeapYear(s32 year)
     return ((year % 4) == 0 && (year % 100) != 0) || ((year % 400) == 0);
 }
 
-THUMB_FUNC s32 FUN_02012710(const RTCDate * date)
+THUMB_FUNC s32 GF_RTC_GetDayOfYear(const RTCDate * date)
 {
     RTCDate date_stack;
     s32 days;
@@ -167,15 +169,15 @@ THUMB_FUNC enum RTC_TimeOfDay GF_RTC_GetTimeOfDayByHour(s32 hour)
     return sTimeOfDayByHour[hour];
 }
 
-THUMB_FUNC s64 FUN_020127C0(s64 r4r7, s64 r5r6)
+THUMB_FUNC s64 GF_RTC_TimeDelta(s64 first, s64 last)
 {
     RTCDate maxDate = { 99, 12, 31, 0 };
     RTCTime maxTime = { 23, 59, 59 };
 
-    s64 r2r3 = RTC_ConvertDateTimeToSecond(&maxDate, &maxTime);
-    GF_ASSERT(r2r3 == 3155759999ll);
-    if (r4r7 < r5r6)
-        return r5r6 - r4r7;
+    s64 check = RTC_ConvertDateTimeToSecond(&maxDate, &maxTime);
+    GF_ASSERT(check == MAX_SECONDS);
+    if (first < last)
+        return last - first;
     else
-        return r5r6 + (3155759999ll - r4r7);
+        return last + (MAX_SECONDS - first);
 }