diff --git a/stdlib/Dates/test/types.jl b/stdlib/Dates/test/types.jl
index 8823e56e41a2f..1cff685ae7beb 100644
--- a/stdlib/Dates/test/types.jl
+++ b/stdlib/Dates/test/types.jl
@@ -256,7 +256,11 @@ end
 end
 
 @testset "issue #31524" begin
-    dt1 = Libc.strptime("%Y-%M-%dT%H:%M:%SZ", "2018-11-16T10:26:14Z")
+    # Ensure the result doesn't depend on local timezone, especially on macOS
+    # where an extra internal call to `mktime` is affected by timezone settings.
+    dt1 = withenv("TZ" => "UTC") do
+        Libc.strptime("%Y-%m-%dT%H:%M:%SZ", "2018-11-16T10:26:14Z")
+    end
     dt2 = Libc.TmStruct(14, 30, 5, 10, 1, 99, 3, 40, 0)
 
     time = Time(dt1)