diff --git a/CMakeLists.txt b/CMakeLists.txt
index affe5fa5..30e95cf9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -524,6 +524,13 @@ if(NOT WIN32)
     CHECK_FUNCTION_EXISTS_EX(select EVENT__HAVE_SELECT)
 endif()
 
+if(WIN32)
+    CHECK_FUNCTION_EXISTS_EX(_gmtime64_s EVENT__HAVE__GMTIME64_S)
+    if (NOT EVENT__HAVE__GMTIME64_S)
+        CHECK_FUNCTION_EXISTS_EX(_gmtime64 EVENT__HAVE__GMTIME64)
+    endif()
+endif()
+
 CHECK_TYPE_SIZE("uint8_t" EVENT__HAVE_UINT8_T)
 CHECK_TYPE_SIZE("uint16_t" EVENT__HAVE_UINT16_T)
 CHECK_TYPE_SIZE("uint32_t" EVENT__HAVE_UINT32_T)
diff --git a/configure.ac b/configure.ac
index 835ea690..05b4d9d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -393,6 +393,12 @@ AC_CHECK_FUNCS([ \
   getservbyname \
   getrandom \
 ])
+
+AC_CHECK_FUNCS(_gmtime64_s, [have__gmtime64_s=yes], )
+if test "x$have__gmtime64_s" != "xyes"; then
+  AC_CHECK_FUNCS(_gmtime64)
+fi
+
 AM_CONDITIONAL(STRLCPY_IMPL, [test x"$ac_cv_func_strlcpy" = xno])
 
 AC_CACHE_CHECK(
diff --git a/event-config.h.cmake b/event-config.h.cmake
index 5b38b9f1..81abe3f4 100644
--- a/event-config.h.cmake
+++ b/event-config.h.cmake
@@ -289,6 +289,12 @@
 /* Define to 1 if you have the `strtoll' function. */
 #cmakedefine EVENT__HAVE_STRTOLL 1
 
+/* Define to 1 if you have the `_gmtime64_s' function. */
+#cmakedefine EVENT__HAVE__GMTIME64_S 1
+
+/* Define to 1 if you have the `_gmtime64' function. */
+#cmakedefine EVENT__HAVE__GMTIME64 1
+
 /* Define to 1 if the system has the type `struct addrinfo'. */
 #cmakedefine EVENT__HAVE_STRUCT_ADDRINFO 1
 
diff --git a/evutil_time.c b/evutil_time.c
index c3a23589..c576463b 100644
--- a/evutil_time.c
+++ b/evutil_time.c
@@ -158,18 +158,28 @@ evutil_date_rfc1123(char *date, const size_t datelen, const struct tm *tm)
 
 	time_t t = time(NULL);
 
-#ifndef _WIN32
+#if defined(EVENT__HAVE__GMTIME64_S) || !defined(_WIN32)
 	struct tm sys;
 #endif
 
 	/* If `tm` is null, set system's current time. */
 	if (tm == NULL) {
-#ifdef _WIN32
-		/** TODO: detect _gmtime64()/_gmtime64_s() */
-		tm = gmtime(&t);
-#else
+#if !defined(_WIN32)
 		gmtime_r(&t, &sys);
 		tm = &sys;
+		/** detect _gmtime64()/_gmtime64_s() */
+#elif defined(EVENT__HAVE__GMTIME64_S)
+		errno_t err;
+		err = _gmtime64_s(&sys, &t);
+		if (err) {
+			event_errx(1, "Invalid argument to _gmtime64_s");
+		} else {
+			tm = &sys;
+		}
+#elif defined(EVENT__HAVE__GMTIME64)
+		tm = _gmtime64(&t);
+#else
+		tm = gmtime(&t);
 #endif
 	}