Create compare_time.c

datetime/compare_time.c

@@ -0,0 +1,51 @@
+#include <windows.h>
+#include <wchar.h>
+
+int wmain(void) {
+
+    SYSTEMTIME st1 = {0};
+    SYSTEMTIME st2 = {0};
+    FILETIME ft1 = {0};
+    FILETIME ft2 = {0};
+
+    st1.wYear = 2015;
+    st1.wMonth = 4;
+    st1.wDay = 12;
+
+    st2.wYear = 2015;
+    st2.wMonth = 5;
+    st2.wDay = 12;
+
+    int r1 = SystemTimeToFileTime(&st1, &ft1);
+
+    if (r1 == 0) {
+
+        wprintf(L"Failed to convert system time to file time\n (%d)", 
+            GetLastError());
+        return 1;
+    }
+  
+    int r2 = SystemTimeToFileTime(&st2, &ft2);
+
+    if (r2 == 0) {
+
+        wprintf(L"Failed to convert system time to file time\n (%d)", 
+            GetLastError());
+        return 1;
+    }
+    
+    short ct = CompareFileTime(&ft1, &ft2);
+
+    if (ct == -1) {
+
+        wprintf(L"4/12/2015 comes before 5/12/2015\n");
+    } else if (ct == 0) {
+
+        wprintf(L"4/12/2015 is equal to 5/12/2015\n");
+    } else if (ct == 1) {
+
+        wprintf(L"4/12/2015 comes after 5/12/2015\n");
+    }
+
+    return 0;
+}