From 0b6bf01b36f49ab9c3e0cb5b16baa16fe3e108ce Mon Sep 17 00:00:00 2001
From: Stefanos Costa <stefanos.costa1999@gmail.com>
Date: Sat, 1 Aug 2026 22:59:51 +0300
Subject: [PATCH] kernel: preserve microsecond wall-clock resolution

Extracted from 3db2b3c5c5e1a26a861df7ebcacd9ccb8c484420 in KytyPS5/KytyPS5#147.
---
 src/kernel/pthread.cpp |  8 ++++++--
 src/libs/libRtc.cpp    | 21 +++++++--------------
 2 files changed, 13 insertions(+), 16 deletions(-)

diff --git a/src/kernel/pthread.cpp b/src/kernel/pthread.cpp
index 6b1c342..47c0008 100644
--- a/src/kernel/pthread.cpp
+++ b/src/kernel/pthread.cpp
@@ -3886,8 +3886,12 @@ int KYTY_SYSV_ABI KernelGettimeofday(KernelTimeval* tp) {
 	tp->tv_sec  = static_cast<int64_t>(ticks / 1000000);
 	tp->tv_usec = static_cast<int64_t>(ticks % 1000000);
 #else
-	auto dt = Common::DateTime::FromSystemUTC();
-	sec_to_timeval(tp, dt.ToUnix());
+	struct timespec ts {};
+	result = ::clock_gettime(CLOCK_REALTIME, &ts);
+	if (result == 0) {
+		tp->tv_sec  = static_cast<int64_t>(ts.tv_sec);
+		tp->tv_usec = static_cast<int64_t>(ts.tv_nsec / 1000);
+	}
 #endif
 
 	if (result == 0) {
diff --git a/src/libs/libRtc.cpp b/src/libs/libRtc.cpp
index dc55f66..fda2623 100644
--- a/src/libs/libRtc.cpp
+++ b/src/libs/libRtc.cpp
@@ -4,6 +4,7 @@
 #include "libs/libs.h"
 #include "loader/symbolDatabase.h"
 
+#include <chrono>
 #include <cstdint>
 #include <cstdio>
 #include <limits>
@@ -247,20 +248,12 @@ static int KYTY_SYSV_ABI RtcGetCurrentTick(RtcTick* tick) {
 		return RTC_ERROR_DATETIME_UNINITIALIZED;
 	}
 
-	const auto now  = Common::DateTime::FromSystemUTC();
-	const auto date = now.GetDate();
-	const auto tod  = now.GetTime();
-
-	RtcDateTime time {};
-	time.year        = static_cast<uint16_t>(date.Year());
-	time.month       = static_cast<uint16_t>(date.Month());
-	time.day         = static_cast<uint16_t>(date.Day());
-	time.hour        = static_cast<uint16_t>(tod.Hour24());
-	time.minute      = static_cast<uint16_t>(tod.Minute());
-	time.second      = static_cast<uint16_t>(tod.Second());
-	time.microsecond = static_cast<uint32_t>(tod.Msec() * 1000);
-
-	return RtcGetTick(&time, tick);
+	const auto now_us =
+	    static_cast<uint64_t>(std::chrono::duration_cast<std::chrono::microseconds>(
+	                              std::chrono::system_clock::now().time_since_epoch())
+	                              .count());
+	tick->tick = RTC_UNIX_EPOCH_TICKS + now_us;
+	return OK;
 }
 
 static int KYTY_SYSV_ABI RtcGetCurrentNetworkTick(RtcTick* tick) {