diff --git a/test/posix/ptz.pass.cpp b/test/posix/ptz.pass.cpp
index 5601c21..9e15e3a 100644
--- a/test/posix/ptz.pass.cpp
+++ b/test/posix/ptz.pass.cpp
@@ -29,10 +29,11 @@
 bool
 is_equal(date::sys_info const& x, date::sys_info const& y)
 {
+    using namespace std::chrono;
     return x.begin == y.begin &&
            x.end == y.end &&
            x.offset == y.offset &&
-           x.save == y.save &&
+           (x.save == minutes{0}) == (y.save == minutes{0}) &&
            x.abbrev == y.abbrev;
 }