From 0eaa39b4716387312fd7c7c474c8b24692540d15 Mon Sep 17 00:00:00 2001
From: Jan Bodnar <jan.bodnar@gmail.com>
Date: Mon, 1 Feb 2016 10:04:06 +0100
Subject: [PATCH] Create unix_time.c

---
 datetime/unix_time.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 datetime/unix_time.c

diff --git a/datetime/unix_time.c b/datetime/unix_time.c
new file mode 100644
index 0000000..a576fed
--- /dev/null
+++ b/datetime/unix_time.c
@@ -0,0 +1,34 @@
+#include <windows.h>
+#include <wchar.h>
+
+#define WINDOWS_TICKS_PER_SEC 10000000
+#define EPOCH_DIFFERENCE 11644473600LL
+
+long long WindowsTicksToUnixSeconds(long long);
+
+int wmain(void) {
+
+    FILETIME ft = {0};
+  
+    GetSystemTimeAsFileTime(&ft);
+
+    LARGE_INTEGER li = {0};    
+
+    li.LowPart = ft.dwLowDateTime;
+    li.HighPart = ft.dwHighDateTime;
+
+    long long int hns = li.QuadPart;
+    
+    wprintf(L"Windows API time: %lli\n", hns);
+
+    long long int utm = WindowsTicksToUnixSeconds(hns);
+
+    wprintf(L"Unix time: %lli\n", utm);
+
+    return 0;
+}
+
+long long int WindowsTicksToUnixSeconds(long long windowsTicks) {
+
+     return (windowsTicks / WINDOWS_TICKS_PER_SEC - EPOCH_DIFFERENCE);
+}