From 7cbab8a61e6ff858d505cb63c3c7839dbc6df9d4 Mon Sep 17 00:00:00 2001
From: PQCraft <0456523@gmail.com>
Date: Mon, 7 Aug 2023 00:58:27 -0400
Subject: [PATCH] Add localtime

This makes a call to GetTimeZoneInformation in winapi/timezoneapi.h, offsets the time given by the output of GetTimeZoneInformation, passes it to gmtime, and returns the result from gmtime.
---
 functions/time/localtime.c               | 28 --------------
 platform/xbox/functions/time/localtime.c | 47 ++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 28 deletions(-)
 delete mode 100644 functions/time/localtime.c
 create mode 100644 platform/xbox/functions/time/localtime.c

diff --git a/functions/time/localtime.c b/functions/time/localtime.c
deleted file mode 100644
index 91c0618d..00000000
--- a/functions/time/localtime.c
+++ /dev/null
@@ -1,28 +0,0 @@
-/* localtime( const time_t * )
-
-   This file is part of the Public Domain C Library (PDCLib).
-   Permission is granted to use, modify, and / or redistribute at will.
-*/
-
-#include <time.h>
-
-#ifndef REGTEST
-
-struct tm * localtime( const time_t * timer )
-{
-    return NULL;
-}
-
-#endif
-
-#ifdef TEST
-
-#include "_PDCLIB_test.h"
-
-int main( void )
-{
-    TESTCASE( NO_TESTDRIVER );
-    return TEST_RESULTS;
-}
-
-#endif
diff --git a/platform/xbox/functions/time/localtime.c b/platform/xbox/functions/time/localtime.c
new file mode 100644
index 00000000..fc09cf3c
--- /dev/null
+++ b/platform/xbox/functions/time/localtime.c
@@ -0,0 +1,47 @@
+/* localtime( const time_t * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <time.h>
+#include <timezoneapi.h>
+
+#ifndef REGTEST
+
+struct tm * localtime( const time_t * timer )
+{
+    TIME_ZONE_INFORMATION tzinfo;
+    DWORD tz = GetTimeZoneInformation( &tzinfo );
+
+    if ( tz == TIME_ZONE_ID_INVALID )
+    {
+        return NULL;
+    }
+    if ( tz == TIME_ZONE_ID_STANDARD )
+    {
+        tzinfo.Bias += tzinfo.StandardBias;
+    }
+    else if ( tz == TIME_ZONE_ID_DAYLIGHT )
+    {
+        tzinfo.Bias += tzinfo.DaylightBias;
+    }
+
+    time_t ltimer = *timer - tzinfo.Bias * 60;
+
+    return gmtime( &ltimer );
+}
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    TESTCASE( NO_TESTDRIVER );
+    return TEST_RESULTS;
+}
+
+#endif