diff --git a/libcxx/include/__config b/libcxx/include/__config
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -390,6 +390,9 @@
 #      define _LIBCPP_HAS_QUICK_EXIT
 #      define _LIBCPP_HAS_TIMESPEC_GET
 #    endif
+#  elif defined(_LIBCPP_MSVCRT)
+     // Using Microsoft's C Runtime library, not MinGW
+#    define _LIBCPP_HAS_TIMESPEC_GET
 #  elif defined(__APPLE__)
      // timespec_get and aligned_alloc were introduced in macOS 10.15 and
      // aligned releases
diff --git a/libcxx/test/libcxx/language.support/has_timespec_get.compile.pass.cpp b/libcxx/test/libcxx/language.support/has_timespec_get.compile.pass.cpp
--- a/libcxx/test/libcxx/language.support/has_timespec_get.compile.pass.cpp
+++ b/libcxx/test/libcxx/language.support/has_timespec_get.compile.pass.cpp
@@ -8,8 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // Make sure TEST_HAS_TIMESPEC_GET (defined by the test suite) and
 // _LIBCPP_HAS_TIMESPEC_GET (defined by libc++) stay in sync.
 
diff --git a/libcxx/test/std/language.support/support.runtime/ctime.pass.cpp b/libcxx/test/std/language.support/support.runtime/ctime.pass.cpp
--- a/libcxx/test/std/language.support/support.runtime/ctime.pass.cpp
+++ b/libcxx/test/std/language.support/support.runtime/ctime.pass.cpp
@@ -8,8 +8,6 @@
 
 // test <ctime>
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 #include <ctime>
 #include <type_traits>
 #include "test_macros.h"
diff --git a/libcxx/test/std/utilities/time/date.time/ctime.pass.cpp b/libcxx/test/std/utilities/time/date.time/ctime.pass.cpp
--- a/libcxx/test/std/utilities/time/date.time/ctime.pass.cpp
+++ b/libcxx/test/std/utilities/time/date.time/ctime.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 #include <ctime>
 #include <type_traits>