diff --git a/Minecraft.Client/Linux/LinuxStubs.h b/Minecraft.Client/Linux/LinuxStubs.h
index 2e16db67d..0b3d2445c 100644
--- a/Minecraft.Client/Linux/LinuxStubs.h
+++ b/Minecraft.Client/Linux/LinuxStubs.h
@@ -18,6 +18,7 @@
 #include <fnmatch.h>
 #include <time.h>
 #include <stdio.h>
+#include <sys/time.h>
 
 #define TRUE true
 #define FALSE false
@@ -160,6 +161,18 @@ typedef struct _LINUXSTUBS_FIND_HANDLE {
     char pattern[MAX_PATH];
 } _LINUXSTUBS_FIND_HANDLE;
 
+// https://learn.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-systemtime
+typedef struct _SYSTEMTIME {
+    WORD wYear;
+    WORD wMonth;
+    WORD wDayOfWeek;
+    WORD wDay;
+    WORD wHour;
+    WORD wMinute;
+    WORD wSecond;
+    WORD wMilliseconds;
+} SYSTEMTIME, *PSYSTEMTIME, *LPSYSTEMTIME;
+
 #define TLS_OUT_OF_INDEXES ((DWORD)0xFFFFFFFF)
 
 typedef pthread_mutex_t RTL_CRITICAL_SECTION;
@@ -520,4 +533,120 @@ static inline BOOL FindClose(HANDLE hFindFile)
     return TRUE;
 }
 
+// internal helper: convert FILETIME (100ns since 1601) to time_t (seconds since 1970)
+static inline time_t _FileTimeToTimeT(const FILETIME& ft)
+{
+    ULONGLONG val = ((ULONGLONG)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
+    const ULONGLONG EPOCH_DIFF = 116444736000000000ULL; // 100ns intervals between 1601-01-01 and 1970-01-01
+    return (time_t)((val - EPOCH_DIFF) / 10000000ULL);
+}
+
+// https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsystemtime
+static inline VOID GetSystemTime(LPSYSTEMTIME lpSystemTime)
+{
+    struct timespec ts;
+#ifdef CLOCK_REALTIME
+    clock_gettime(CLOCK_REALTIME, &ts);
+#else
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    ts.tv_sec = tv.tv_sec;
+    ts.tv_nsec = tv.tv_usec * 1000;
+#endif
+    struct tm tm;
+    gmtime_r(&ts.tv_sec, &tm); // UTC
+
+    lpSystemTime->wYear = tm.tm_year + 1900;
+    lpSystemTime->wMonth = tm.tm_mon + 1;
+    lpSystemTime->wDayOfWeek = tm.tm_wday; // 0 = Sunday
+    lpSystemTime->wDay = tm.tm_mday;
+    lpSystemTime->wHour = tm.tm_hour;
+    lpSystemTime->wMinute = tm.tm_min;
+    lpSystemTime->wSecond = tm.tm_sec;
+    lpSystemTime->wMilliseconds = ts.tv_nsec / 1000000; // ns to ms
+}
+
+// https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getlocaltime
+static inline VOID GetLocalTime(LPSYSTEMTIME lpSystemTime)
+{
+    struct timespec ts;
+#ifdef CLOCK_REALTIME
+    clock_gettime(CLOCK_REALTIME, &ts);
+#else
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    ts.tv_sec = tv.tv_sec;
+    ts.tv_nsec = tv.tv_usec * 1000;
+#endif
+    struct tm tm;
+    localtime_r(&ts.tv_sec, &tm); // local time
+
+    lpSystemTime->wYear = tm.tm_year + 1900;
+    lpSystemTime->wMonth = tm.tm_mon + 1;
+    lpSystemTime->wDayOfWeek = tm.tm_wday;
+    lpSystemTime->wDay = tm.tm_mday;
+    lpSystemTime->wHour = tm.tm_hour;
+    lpSystemTime->wMinute = tm.tm_min;
+    lpSystemTime->wSecond = tm.tm_sec;
+    lpSystemTime->wMilliseconds = ts.tv_nsec / 1000000;
+}
+
+// https://learn.microsoft.com/en-us/windows/win32/api/timezoneapi/nf-timezoneapi-systemtimetofiletime
+static inline BOOL SystemTimeToFileTime(const SYSTEMTIME *lpSystemTime, LPFILETIME lpFileTime)
+{
+    struct tm tm = {0};
+    tm.tm_year = lpSystemTime->wYear - 1900;
+    tm.tm_mon  = lpSystemTime->wMonth - 1;
+    tm.tm_mday = lpSystemTime->wDay;
+    tm.tm_hour = lpSystemTime->wHour;
+    tm.tm_min  = lpSystemTime->wMinute;
+    tm.tm_sec  = lpSystemTime->wSecond;
+    tm.tm_isdst = -1; // unknown
+
+    // Convert to time_t assuming UTC
+    time_t t;
+    // Portable UTC mktime: temporarily set TZ to UTC
+    char *tz_old = getenv("TZ");
+    setenv("TZ", "UTC", 1);
+    tzset();
+    t = mktime(&tm);
+    if (tz_old)
+        setenv("TZ", tz_old, 1);
+    else
+        unsetenv("TZ");
+    tzset();
+
+    if (t == (time_t)-1)
+        return FALSE;
+
+    // Add milliseconds
+    ULONGLONG ft = ((ULONGLONG)t + 11644473600ULL) * 10000000ULL;
+    ft += lpSystemTime->wMilliseconds * 10000ULL; // 1ms = 10000 * 100ns
+
+    lpFileTime->dwLowDateTime = (DWORD)(ft & 0xFFFFFFFF);
+    lpFileTime->dwHighDateTime = (DWORD)(ft >> 32);
+    return TRUE;
+}
+
+// https://learn.microsoft.com/en-us/windows/win32/api/timezoneapi/nf-timezoneapi-filetimetosystemtime
+static inline BOOL FileTimeToSystemTime(const FILETIME *lpFileTime, LPSYSTEMTIME lpSystemTime)
+{
+    time_t t = _FileTimeToTimeT(*lpFileTime);
+    ULONGLONG ft = ((ULONGLONG)lpFileTime->dwHighDateTime << 32) | lpFileTime->dwLowDateTime;
+    ULONGLONG remainder100ns = ft % 10000000ULL; // 1 second = 10^7 * 100ns
+
+    struct tm tm;
+    gmtime_r(&t, &tm); // UTC
+
+    lpSystemTime->wYear = tm.tm_year + 1900;
+    lpSystemTime->wMonth = tm.tm_mon + 1;
+    lpSystemTime->wDayOfWeek = tm.tm_wday;
+    lpSystemTime->wDay = tm.tm_mday;
+    lpSystemTime->wHour = tm.tm_hour;
+    lpSystemTime->wMinute = tm.tm_min;
+    lpSystemTime->wSecond = tm.tm_sec;
+    lpSystemTime->wMilliseconds = (WORD)(remainder100ns / 10000); // 1ms = 10000 * 100ns
+    return TRUE;
+}
+
 #endif // LINUXSTUBS_H
\ No newline at end of file