diff --git a/src/core/libraries/kernel/time_management.h b/src/core/libraries/kernel/time_management.h
index 4f8032c17..a28e6e558 100644
--- a/src/core/libraries/kernel/time_management.h
+++ b/src/core/libraries/kernel/time_management.h
@@ -53,6 +53,7 @@ u64 PS4_SYSV_ABI sceKernelGetProcessTimeCounter();
 u64 PS4_SYSV_ABI sceKernelGetProcessTimeCounterFrequency();
 u64 PS4_SYSV_ABI sceKernelReadTsc();
 int PS4_SYSV_ABI sceKernelClockGettime(s32 clock_id, OrbisKernelTimespec* tp);
+s32 PS4_SYSV_ABI sceKernelGettimezone(OrbisKernelTimezone* tz);
 int PS4_SYSV_ABI sceKernelConvertLocaltimeToUtc(time_t param_1, int64_t param_2, time_t* seconds,
                                                 OrbisKernelTimezone* timezone, int* dst_seconds);
 void timeSymbolsRegister(Core::Loader::SymbolsResolver* sym);
diff --git a/src/core/libraries/rtc/rtc.cpp b/src/core/libraries/rtc/rtc.cpp
index a567a787a..649d21333 100644
--- a/src/core/libraries/rtc/rtc.cpp
+++ b/src/core/libraries/rtc/rtc.cpp
@@ -49,7 +49,7 @@ int PS4_SYSV_ABI sceRtcCheckValid(OrbisRtcDateTime* pTime) {
     if (pTime->microsecond >= 1000000)
         return ORBIS_RTC_ERROR_INVALID_MICROSECOND;
 
-    return 0;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcCompareTick(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2) {
@@ -80,7 +80,7 @@ int PS4_SYSV_ABI sceRtcConvertLocalTimeToUtc(OrbisRtcTick* pTickLocal, OrbisRtcT
 
     if (convertValue >= 0) {
         convertValue = sceRtcTickAddMinutes(
-            pTickUtc, pTickLocal, -((timezone.tz_dsttime + timezone.tz_minuteswest) / 0x3c));
+            pTickUtc, pTickLocal, -((timezone.tz_dsttime + timezone.tz_minuteswest) / 60));
     }
 
     return convertValue;
@@ -99,7 +99,7 @@ int PS4_SYSV_ABI sceRtcConvertUtcToLocalTime(OrbisRtcTick* pTickUtc, OrbisRtcTic
         (pTickUtc->tick + 0xff23400100d44000U) / 1000000, &seconds, &timezone, 0);
 
     if (convertValue >= 0) {
-        auto newTime = ((timezone.dst_sec + timezone.west_sec) / 0x3c) * 60000000;
+        auto newTime = ((timezone.dst_sec + timezone.west_sec) / 60) * 60000000;
 
         if (pTickLocal == nullptr)
             return ORBIS_RTC_ERROR_INVALID_POINTER;
@@ -121,10 +121,11 @@ int PS4_SYSV_ABI sceRtcConvertUtcToLocalTime(OrbisRtcTick* pTickUtc, OrbisRtcTic
 }
 
 int PS4_SYSV_ABI sceRtcEnd() {
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcFormatRFC2822(char* pszDateTime, const OrbisRtcTick* pTickUtc, int minutes) {
+int PS4_SYSV_ABI sceRtcFormatRFC2822(char* pszDateTime, const OrbisRtcTick* pTickUtc,
+                                     int iTimeZoneMinutes) {
     LOG_ERROR(Lib_Rtc, "(STUBBED) called");
     return ORBIS_OK;
 }
@@ -134,7 +135,8 @@ int PS4_SYSV_ABI sceRtcFormatRFC2822LocalTime(char* pszDateTime, const OrbisRtcT
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceRtcFormatRFC3339(char* pszDateTime, const OrbisRtcTick* pTickUtc, int minutes) {
+int PS4_SYSV_ABI sceRtcFormatRFC3339(char* pszDateTime, const OrbisRtcTick* pTickUtc,
+                                     int iTimeZoneMinutes) {
     LOG_ERROR(Lib_Rtc, "(STUBBED) called");
     return ORBIS_OK;
 }
@@ -145,7 +147,7 @@ int PS4_SYSV_ABI sceRtcFormatRFC3339LocalTime(char* pszDateTime, const OrbisRtcT
 }
 
 int PS4_SYSV_ABI sceRtcFormatRFC3339Precise(char* pszDateTime, const OrbisRtcTick* pTickUtc,
-                                            int minutes) {
+                                            int iTimeZoneMinutes) {
     LOG_ERROR(Lib_Rtc, "(STUBBED) called");
     return ORBIS_OK;
 }
@@ -163,7 +165,7 @@ int PS4_SYSV_ABI sceRtcGetCurrentAdNetworkTick(OrbisRtcTick* pTick) {
         return ORBIS_RTC_ERROR_INVALID_POINTER;
 
     Kernel::OrbisKernelTimespec clocktime;
-    int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_EXT_NETWORK, &clocktime);
+    int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_REALTIME, &clocktime);
 
     if (returnValue == 0) {
         pTick->tick = clocktime.tv_nsec / 1000 + clocktime.tv_sec * 1000000 + 0xdcbffeff2bc000;
@@ -171,14 +173,14 @@ int PS4_SYSV_ABI sceRtcGetCurrentAdNetworkTick(OrbisRtcTick* pTick) {
         return ORBIS_RTC_ERROR_NOT_INITIALIZED;
     }
 
-    return 0;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcGetCurrentClock(OrbisRtcDateTime* pTime, int timeZone) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTime == nullptr)
-        return ORBIS_RTC_ERROR_INVALID_POINTER;
+        return ORBIS_RTC_ERROR_DATETIME_UNINITIALIZED;
 
     Kernel::OrbisKernelTimespec clocktime;
     int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_REALTIME, &clocktime);
@@ -191,6 +193,9 @@ int PS4_SYSV_ABI sceRtcGetCurrentClock(OrbisRtcDateTime* pTime, int timeZone) {
         sceRtcSetTick(pTime, &clockTick);
     }
 
+    LOG_INFO(Lib_Rtc, "Got Current Clock {}/{}/{} @ {}:{}", pTime->year, pTime->month, pTime->day,
+             pTime->hour, pTime->minute);
+
     return returnValue;
 }
 
@@ -198,28 +203,37 @@ int PS4_SYSV_ABI sceRtcGetCurrentClockLocalTime(OrbisRtcDateTime* pTime) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTime == nullptr)
-        return ORBIS_RTC_ERROR_INVALID_POINTER;
+        return ORBIS_RTC_ERROR_DATETIME_UNINITIALIZED;
 
-    Kernel::OrbisKernelTimespec clocktime;
-    int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_REALTIME, &clocktime);
+    Kernel::OrbisKernelTimezone timeZone;
+    int returnValue = Kernel::sceKernelGettimezone(&timeZone);
 
     if (returnValue >= 0) {
-        u64 clockTick = clocktime.tv_nsec / 1000 + clocktime.tv_sec * 1000000 + 0xdcbffeff2bc000;
+        Kernel::OrbisKernelTimespec clocktime;
 
-        time_t seconds;
-        Kernel::OrbisTimesec timezone;
-
-        returnValue =
-            Kernel::sceKernelConvertUtcToLocaltime(clockTick / 1000000, &seconds, &timezone, 0);
+        // calculate total timezone offset for converting UTC to local time
+        uint64_t tzOffset = -(timeZone.tz_minuteswest - (timeZone.tz_dsttime * 60));
 
+        returnValue = sceKernelClockGettime(0, &clocktime);
         if (returnValue >= 0) {
             OrbisRtcTick newTick;
-            newTick.tick = clockTick;
-            sceRtcTickAddMinutes(&newTick, &newTick, (timezone.dst_sec + timezone.west_sec) / 0x3c);
+            newTick.tick =
+                ((unsigned __int64)((unsigned __int128)(clocktime.tv_nsec *
+                                                        (signed __int128)2361183241434822607LL) >>
+                                    64) >>
+                 63) +
+                ((signed __int64)((unsigned __int128)(clocktime.tv_nsec *
+                                                      (signed __int128)2361183241434822607LL) >>
+                                  64) >>
+                 7) +
+                1000000 * clocktime.tv_sec + 62135596800000000LL;
+            sceRtcTickAddMinutes(&newTick, &newTick, tzOffset);
             sceRtcSetTick(pTime, &newTick);
         }
     }
 
+    LOG_INFO(Lib_Rtc, "Got Local Time {}/{}/{} @ {}:{}", pTime->year, pTime->month, pTime->day,
+             pTime->hour, pTime->minute);
     return returnValue;
 }
 
@@ -230,7 +244,7 @@ int PS4_SYSV_ABI sceRtcGetCurrentDebugNetworkTick(OrbisRtcTick* pTick) {
         return ORBIS_RTC_ERROR_INVALID_POINTER;
 
     Kernel::OrbisKernelTimespec clocktime;
-    int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_EXT_NETWORK, &clocktime);
+    int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_REALTIME, &clocktime);
 
     if (returnValue == 0) {
         pTick->tick = clocktime.tv_nsec / 1000 + clocktime.tv_sec * 1000000 + 0xdcbffeff2bc000;
@@ -238,7 +252,7 @@ int PS4_SYSV_ABI sceRtcGetCurrentDebugNetworkTick(OrbisRtcTick* pTick) {
         return ORBIS_RTC_ERROR_NOT_INITIALIZED;
     }
 
-    return 0;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcGetCurrentNetworkTick(OrbisRtcTick* pTick) {
@@ -248,7 +262,7 @@ int PS4_SYSV_ABI sceRtcGetCurrentNetworkTick(OrbisRtcTick* pTick) {
         return ORBIS_RTC_ERROR_INVALID_POINTER;
 
     Kernel::OrbisKernelTimespec clocktime;
-    int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_EXT_NETWORK, &clocktime);
+    int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_REALTIME, &clocktime);
 
     if (returnValue == 0) {
         pTick->tick = clocktime.tv_nsec / 1000 + clocktime.tv_sec * 1000000 + 0xdcbffeff2bc000;
@@ -256,7 +270,7 @@ int PS4_SYSV_ABI sceRtcGetCurrentNetworkTick(OrbisRtcTick* pTick) {
         return ORBIS_RTC_ERROR_NOT_INITIALIZED;
     }
 
-    return 0;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcGetCurrentRawNetworkTick(OrbisRtcTick* pTick) {
@@ -266,8 +280,7 @@ int PS4_SYSV_ABI sceRtcGetCurrentRawNetworkTick(OrbisRtcTick* pTick) {
         return ORBIS_RTC_ERROR_INVALID_POINTER;
 
     Kernel::OrbisKernelTimespec clocktime;
-    int returnValue =
-        Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_EXT_RAW_NETWORK, &clocktime);
+    int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_REALTIME, &clocktime);
 
     if (returnValue == 0) {
         pTick->tick = clocktime.tv_nsec / 1000 + clocktime.tv_sec * 1000000 + 0xdcbffeff2bc000;
@@ -275,14 +288,14 @@ int PS4_SYSV_ABI sceRtcGetCurrentRawNetworkTick(OrbisRtcTick* pTick) {
         return ORBIS_RTC_ERROR_NOT_INITIALIZED;
     }
 
-    return 0;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcGetCurrentTick(OrbisRtcTick* pTick) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick == nullptr)
-        return ORBIS_RTC_ERROR_INVALID_POINTER;
+        return ORBIS_RTC_ERROR_DATETIME_UNINITIALIZED;
 
     Kernel::OrbisKernelTimespec clocktime;
     int returnValue = Kernel::sceKernelClockGettime(Kernel::ORBIS_CLOCK_REALTIME, &clocktime);
@@ -291,29 +304,63 @@ int PS4_SYSV_ABI sceRtcGetCurrentTick(OrbisRtcTick* pTick) {
         pTick->tick = clocktime.tv_nsec / 1000 + clocktime.tv_sec * 1000000 + 0xdcbffeff2bc000;
     }
 
-    return returnValue;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcGetDayOfWeek(int year, int month, int day) {
-    LOG_ERROR(Lib_Rtc, "(STUBBED) called");
-    return ORBIS_OK;
-}
-
-int PS4_SYSV_ABI sceRtcGetDaysInMonth(int iYear, int iMonth) {
     LOG_TRACE(Lib_Rtc, "called");
 
-    if (iYear <= 0)
+    int sdk_version = 0;
+    int sdkResult = Kernel::sceKernelGetCompiledSdkVersion(&sdk_version);
+    if (sdkResult != ORBIS_OK) {
+        sdk_version = 0;
+    }
+
+    if (sdk_version < 0x3000000) {
+        if (year < 1) {
+            return ORBIS_RTC_ERROR_INVALID_YEAR;
+        }
+        if (month > 12 || month <= 0) {
+            return ORBIS_RTC_ERROR_INVALID_MONTH;
+        }
+    } else {
+        if (year > 9999 || year < 1) {
+            return ORBIS_RTC_ERROR_INVALID_YEAR;
+        }
+        if (month > 12 || month <= 0) {
+            return ORBIS_RTC_ERROR_INVALID_MONTH;
+        }
+    }
+
+    int daysInMonth = sceRtcGetDaysInMonth(year, month);
+
+    if (day <= 0 || day > daysInMonth)
+        return ORBIS_RTC_ERROR_INVALID_DAY;
+
+    std::chrono::sys_days chrono_time{std::chrono::year(year) / std::chrono::month(month) /
+                                      std::chrono::day(day)};
+    std::chrono::weekday chrono_weekday{chrono_time};
+
+    LOG_INFO(Lib_Rtc, "Got Day Of Week : {}", chrono_weekday.c_encoding());
+
+    return chrono_weekday.c_encoding();
+}
+
+int PS4_SYSV_ABI sceRtcGetDaysInMonth(int year, int month) {
+    LOG_TRACE(Lib_Rtc, "called");
+
+    if (year <= 0)
         return ORBIS_RTC_ERROR_INVALID_YEAR;
 
-    if (iMonth <= 0 || iMonth > 12)
+    if (month <= 0 || month > 12)
         return ORBIS_RTC_ERROR_INVALID_MONTH;
 
-    using namespace std::chrono;
+    std::chrono::year chronoYear = std::chrono::year(year);
+    std::chrono::month chronoMonth = std::chrono::month(month);
+    int lastDay = static_cast<int>(unsigned(
+        std::chrono::year_month_day_last{chronoYear / chronoMonth / std::chrono::last}.day()));
 
-    year chronoYear = year(iYear);
-    month chronoMonth = month(iMonth);
-    int lastDay =
-        static_cast<int>(unsigned(year_month_day_last{chronoYear / chronoMonth / last}.day()));
+    LOG_INFO(Lib_Rtc, "Got Days In Month : {}", lastDay);
 
     return lastDay;
 }
@@ -355,7 +402,7 @@ int PS4_SYSV_ABI sceRtcGetTick(OrbisRtcDateTime* pTime, OrbisRtcTick* pTick) {
 
     pTick->tick = days + msec;
 
-    return 0;
+    return SCE_OK;
 }
 
 unsigned int PS4_SYSV_ABI sceRtcGetTickResolution() {
@@ -375,7 +422,7 @@ int PS4_SYSV_ABI sceRtcGetWin32FileTime(OrbisRtcDateTime* pTime, uint64_t* ulWin
 }
 
 int PS4_SYSV_ABI sceRtcInit() {
-    return 0;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcIsLeapYear(int yearInt) {
@@ -442,7 +489,7 @@ int PS4_SYSV_ABI sceRtcSetDosTime(OrbisRtcDateTime* pTime, u32 dosTime) {
     pTime->month = (days >> 5) & 0xf;
     pTime->year = (days >> 9) + 0x7bc;
 
-    return 0;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcSetTick(OrbisRtcDateTime* pTime, OrbisRtcTick* pTick) {
@@ -491,7 +538,7 @@ int PS4_SYSV_ABI sceRtcSetTick(OrbisRtcDateTime* pTime, OrbisRtcTick* pTick) {
     msec %= 1000000;
     pTime->microsecond = msec;
 
-    return 0;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcSetTime_t(OrbisRtcDateTime* pTime, time_t llTime) {
@@ -519,7 +566,7 @@ int PS4_SYSV_ABI sceRtcSetTime_t(OrbisRtcDateTime* pTime, time_t llTime) {
     newTick.tick += 0xdcbffeff2bc000;
     sceRtcSetTick(pTime, &newTick);
 
-    return ORBIS_OK;
+    return SCE_OK;
 }
 
 int PS4_SYSV_ABI sceRtcSetWin32FileTime(OrbisRtcDateTime* pTime, uint64_t ulWin32Time) {
@@ -535,10 +582,10 @@ int PS4_SYSV_ABI sceRtcSetWin32FileTime(OrbisRtcDateTime* pTime, uint64_t ulWin3
 
     sceRtcSetTick(pTime, &convertedTick);
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddDays(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s32 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddDays(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -546,10 +593,10 @@ int PS4_SYSV_ABI sceRtcTickAddDays(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s
 
     pTick1->tick = (lAdd * 86400000000) + pTick2->tick;
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddHours(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s32 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddHours(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -557,10 +604,11 @@ int PS4_SYSV_ABI sceRtcTickAddHours(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
 
     pTick1->tick = (lAdd * 3600000000) + pTick2->tick;
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddMicroseconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s64 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddMicroseconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
+                                           int64_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -568,10 +616,10 @@ int PS4_SYSV_ABI sceRtcTickAddMicroseconds(OrbisRtcTick* pTick1, OrbisRtcTick* p
 
     pTick1->tick = lAdd + pTick2->tick;
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddMinutes(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s64 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddMinutes(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int64_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -579,10 +627,10 @@ int PS4_SYSV_ABI sceRtcTickAddMinutes(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2
 
     pTick1->tick = (lAdd * 60000000) + pTick2->tick;
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddMonths(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s32 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddMonths(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -590,7 +638,7 @@ int PS4_SYSV_ABI sceRtcTickAddMonths(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
 
     if (lAdd == 0) {
         pTick1->tick = pTick2->tick;
-        return 0;
+        return SCE_OK;
     }
 
     OrbisRtcDateTime time;
@@ -632,10 +680,10 @@ int PS4_SYSV_ABI sceRtcTickAddMonths(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
         return timeIsValid;
     }
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddSeconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s64 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddSeconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int64_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -643,10 +691,10 @@ int PS4_SYSV_ABI sceRtcTickAddSeconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2
 
     pTick1->tick = (lAdd * 1000000) + pTick2->tick;
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddTicks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s64 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddTicks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int64_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -654,10 +702,10 @@ int PS4_SYSV_ABI sceRtcTickAddTicks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
 
     pTick1->tick = lAdd + pTick2->tick;
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddWeeks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s32 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddWeeks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -665,10 +713,10 @@ int PS4_SYSV_ABI sceRtcTickAddWeeks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
 
     pTick1->tick = (lAdd * 0x8cd0e3a000) + pTick2->tick;
 
-    return 0;
+    return SCE_OK;
 }
 
-int PS4_SYSV_ABI sceRtcTickAddYears(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s16 lAdd) {
+int PS4_SYSV_ABI sceRtcTickAddYears(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd) {
     LOG_TRACE(Lib_Rtc, "called");
 
     if (pTick1 == nullptr || pTick2 == nullptr)
@@ -678,7 +726,7 @@ int PS4_SYSV_ABI sceRtcTickAddYears(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
 
     if (lAdd == 0) {
         pTick1->tick = pTick2->tick;
-        return 0;
+        return SCE_OK;
     }
 
     sceRtcSetTick(&time, pTick1);
@@ -692,7 +740,7 @@ int PS4_SYSV_ABI sceRtcTickAddYears(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
         return timeIsValid;
     }
 
-    return 0;
+    return SCE_OK;
 }
 
 void RegisterlibSceRtc(Core::Loader::SymbolsResolver* sym) {
diff --git a/src/core/libraries/rtc/rtc.h b/src/core/libraries/rtc/rtc.h
index aa910ae23..e9dc3171d 100644
--- a/src/core/libraries/rtc/rtc.h
+++ b/src/core/libraries/rtc/rtc.h
@@ -11,18 +11,26 @@ class SymbolsResolver;
 
 namespace Libraries::Rtc {
 
+constexpr int ORBIS_RTC_DAYOFWEEK_SUNDAY = 0;
+constexpr int ORBIS_RTC_DAYOFWEEK_MONDAY = 1;
+constexpr int ORBIS_RTC_DAYOFWEEK_TUESDAY = 2;
+constexpr int ORBIS_RTC_DAYOFWEEK_WEDNESDAY = 3;
+constexpr int ORBIS_RTC_DAYOFWEEK_THURSDAY = 4;
+constexpr int ORBIS_RTC_DAYOFWEEK_FRIDAY = 5;
+constexpr int ORBIS_RTC_DAYOFWEEK_SATURDAY = 6;
+
 struct OrbisRtcTick {
-    u64 tick;
+    uint64_t tick;
 };
 
 struct OrbisRtcDateTime {
-    int16_t year;
-    int16_t month;
-    int16_t day;
-    int16_t hour;
-    int16_t minute;
-    int16_t second;
-    int32_t microsecond;
+    uint16_t year;
+    uint16_t month;
+    uint16_t day;
+    uint16_t hour;
+    uint16_t minute;
+    uint16_t second;
+    uint32_t microsecond;
 };
 
 int PS4_SYSV_ABI sceRtcCheckValid(OrbisRtcDateTime* pTime);
@@ -65,15 +73,16 @@ int PS4_SYSV_ABI sceRtcSetDosTime(OrbisRtcDateTime* pTime, u32 dosTime);
 int PS4_SYSV_ABI sceRtcSetTick(OrbisRtcDateTime* pTime, OrbisRtcTick* pTick);
 int PS4_SYSV_ABI sceRtcSetTime_t(OrbisRtcDateTime* pTime, time_t llTime);
 int PS4_SYSV_ABI sceRtcSetWin32FileTime(OrbisRtcDateTime* pTime, uint64_t ulWin32Time);
-int PS4_SYSV_ABI sceRtcTickAddDays(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s32 lAdd);
-int PS4_SYSV_ABI sceRtcTickAddHours(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s32 lAdd);
-int PS4_SYSV_ABI sceRtcTickAddMicroseconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s64 lAdd);
-int PS4_SYSV_ABI sceRtcTickAddMinutes(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s64 lAdd);
-int PS4_SYSV_ABI sceRtcTickAddMonths(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s32 lAdd);
-int PS4_SYSV_ABI sceRtcTickAddSeconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s64 lAdd);
-int PS4_SYSV_ABI sceRtcTickAddTicks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s64 lAdd);
-int PS4_SYSV_ABI sceRtcTickAddWeeks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s32 lAdd);
-int PS4_SYSV_ABI sceRtcTickAddYears(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, s16 lAdd);
+int PS4_SYSV_ABI sceRtcTickAddDays(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd);
+int PS4_SYSV_ABI sceRtcTickAddHours(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd);
+int PS4_SYSV_ABI sceRtcTickAddMicroseconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2,
+                                           int64_t lAdd);
+int PS4_SYSV_ABI sceRtcTickAddMinutes(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int64_t lAdd);
+int PS4_SYSV_ABI sceRtcTickAddMonths(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd);
+int PS4_SYSV_ABI sceRtcTickAddSeconds(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int64_t lAdd);
+int PS4_SYSV_ABI sceRtcTickAddTicks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int64_t lAdd);
+int PS4_SYSV_ABI sceRtcTickAddWeeks(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd);
+int PS4_SYSV_ABI sceRtcTickAddYears(OrbisRtcTick* pTick1, OrbisRtcTick* pTick2, int32_t lAdd);
 
 void RegisterlibSceRtc(Core::Loader::SymbolsResolver* sym);
 } // namespace Libraries::Rtc
\ No newline at end of file
diff --git a/src/core/libraries/rtc/rtc_error.h b/src/core/libraries/rtc/rtc_error.h
index cbcde6f41..3af5a68fd 100644
--- a/src/core/libraries/rtc/rtc_error.h
+++ b/src/core/libraries/rtc/rtc_error.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+constexpr int ORBIS_RTC_ERROR_DATETIME_UNINITIALIZED = 0x7FFEF9FE;
 constexpr int ORBIS_RTC_ERROR_INVALID_PARAMETER = 0x80010602;
 constexpr int ORBIS_RTC_ERROR_INVALID_TICK_PARAMETER = 0x80010603;
 constexpr int ORBIS_RTC_ERROR_INVALID_DATE_PARAMETER = 0x80010604;