MemoryCard PutTo implementations

Runtime/CBasicsPC.cpp

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdarg.h>
+#include <time.h>
 
 #include "CBasics.hpp"
 
@@ -20,4 +21,42 @@ const char* CBasics::Stringize(const char* fmt, ...)
     return STRINGIZE_STR;
 }
 
+const u64 CBasics::SECONDS_TO_2000 = 946684800LL;
+const u64 CBasics::TICKS_PER_SECOND = 60750000LL;
+
+OSTime CBasics::ToWiiTime(std::chrono::system_clock::time_point time)
+{
+    time_t sysTime, tzDiff;
+    struct tm* gmTime;
+
+    sysTime = std::chrono::system_clock::to_time_t(time);
+    // Account for DST where needed
+    gmTime = localtime(&sysTime);
+    if (!gmTime)
+        return 0;
+
+    // Lazy way to get local time in sec
+    gmTime = gmtime(&sysTime);
+    tzDiff = sysTime - mktime(gmTime);
+
+    return OSTime(TICKS_PER_SECOND * ((sysTime + tzDiff) - SECONDS_TO_2000));
+}
+
+std::chrono::system_clock::time_point CBasics::FromWiiTime(OSTime wiiTime)
+{
+    time_t time = SECONDS_TO_2000 + wiiTime / TICKS_PER_SECOND;
+
+    time_t sysTime = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
+    // Account for DST where needed
+    struct tm* gmTime = localtime(&sysTime);
+    if (!gmTime)
+        return std::chrono::system_clock::from_time_t(0);
+
+    // Lazy way to get local time in sec
+    gmTime = gmtime(&sysTime);
+    time_t tzDiff = sysTime - mktime(gmTime);
+
+    return std::chrono::system_clock::from_time_t(time - tzDiff);
+}
+
 }