Fix up date

Colin Robertson · Colin Robertson · commit a6ec4b9bc22a · 2019-05-14T11:43:32.000-07:00
diff --git a/docs/c-runtime-library/complex-math-support.md b/docs/c-runtime-library/complex-math-support.md
@@ -1,6 +1,6 @@
 ---
 title: "C complex math support"
-ms.date: "03/30/2018"
+ms.date: "05/14/2019"
 f1_keywords: ["c.complex"]
 helpviewer_keywords: ["complex numbers, math routines", "math routines", "complex numbers"]
 ---
