diff --git a/core/src/test/scala/org/apache/spark/status/api/v1/SimpleDateParamSuite.scala b/core/src/test/scala/org/apache/spark/status/api/v1/SimpleDateParamSuite.scala
index 63b0e77629dde1d8bfde151710c4735d3898ff99..18baeb1cb9c716e7d49252c86d796c9b1607415f 100644
--- a/core/src/test/scala/org/apache/spark/status/api/v1/SimpleDateParamSuite.scala
+++ b/core/src/test/scala/org/apache/spark/status/api/v1/SimpleDateParamSuite.scala
@@ -26,7 +26,8 @@ class SimpleDateParamSuite extends SparkFunSuite with Matchers {
 
   test("date parsing") {
     new SimpleDateParam("2015-02-20T23:21:17.190GMT").timestamp should be (1424474477190L)
-    new SimpleDateParam("2015-02-20T17:21:17.190EST").timestamp should be (1424470877190L)
+    // don't use EST, it is ambiguous, use -0500 instead, see SPARK-15723
+    new SimpleDateParam("2015-02-20T17:21:17.190-0500").timestamp should be (1424470877190L)
     new SimpleDateParam("2015-02-20").timestamp should be (1424390400000L) // GMT
     intercept[WebApplicationException] {
       new SimpleDateParam("invalid date")