diff --git a/test/tz_test/zoned_time_deduction.pass.cpp b/test/tz_test/zoned_time_deduction.pass.cpp
new file mode 100644
index 0000000..d57c226
--- /dev/null
+++ b/test/tz_test/zoned_time_deduction.pass.cpp
@@ -0,0 +1,220 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2019 Tomasz Kamiński
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include "tz.h"
+#include <cassert>
+#include <type_traits>
+#include <string>
+
+#if HAS_DEDUCTION_GUIDES
+#include <string_view>
+
+template<typename TimeZonePtr, typename Source>
+void testDeductionFrom(Source&& s)
+{
+    using namespace date;
+    using namespace std::chrono;
+
+    // No time point
+    {
+        zoned_time zt(std::forward<Source>(s));
+        static_assert(std::is_same<decltype(zt), zoned_time<seconds, TimeZonePtr>>::value, "");
+    }
+
+    // sys_time
+    {
+        sys_days sd(2017_y/feb/20);
+        zoned_time ztd(std::forward<Source>(s), sd);
+        static_assert(std::is_same<decltype(ztd), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        sys_time<seconds> ss(sd);
+        zoned_time zts(std::forward<Source>(s), ss);
+        static_assert(std::is_same<decltype(zts), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        sys_time<milliseconds> sms(ss);
+        zoned_time ztms(std::forward<Source>(s), sms);
+        static_assert(std::is_same<decltype(ztms), zoned_time<milliseconds, TimeZonePtr>>::value, "");
+    }
+
+    // local_time
+    {
+        local_days ld(2017_y/feb/20);
+        zoned_time ztd(std::forward<Source>(s), ld);
+        static_assert(std::is_same<decltype(ztd), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        local_time<seconds> ls(ld);
+        zoned_time zts(std::forward<Source>(s), ls);
+        static_assert(std::is_same<decltype(zts), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        local_time<milliseconds> lms(ls);
+        zoned_time ztms(std::forward<Source>(s), lms);
+        static_assert(std::is_same<decltype(ztms), zoned_time<milliseconds, TimeZonePtr>>::value, "");
+    }
+
+    // local_time, choose
+    {
+        local_days ld(2017_y/feb/20);
+        zoned_time ztd(std::forward<Source>(s), ld, choose::earliest);
+        static_assert(std::is_same<decltype(ztd), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        local_time<seconds> ls(ld);
+        zoned_time zts(std::forward<Source>(s), ls, choose::earliest);
+        static_assert(std::is_same<decltype(zts), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        local_time<milliseconds> lms(ls);
+        zoned_time ztms(std::forward<Source>(s), lms, choose::earliest);
+        static_assert(std::is_same<decltype(ztms), zoned_time<milliseconds, TimeZonePtr>>::value, "");
+    }
+
+    // zoned_time
+    {
+        zoned_time<days> zd(sys_days(2017_y/feb/20));
+        zoned_time ztd(std::forward<Source>(s), zd);
+        static_assert(std::is_same<decltype(ztd), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        zoned_time<seconds> zs(zd);
+        zoned_time zts(std::forward<Source>(s), zs);
+        static_assert(std::is_same<decltype(zts), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        zoned_time<milliseconds> zms(zs);
+        zoned_time ztms(std::forward<Source>(s), zms);
+        static_assert(std::is_same<decltype(ztms), zoned_time<milliseconds, TimeZonePtr>>::value, "");
+    }
+
+    // zoned_time, choose
+    {
+        zoned_time<days> zd(sys_days(2017_y/feb/20));
+        zoned_time ztd(std::forward<Source>(s), zd, choose::earliest);
+        static_assert(std::is_same<decltype(ztd), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        zoned_time<seconds> zs(zd);
+        zoned_time zts(std::forward<Source>(s), zs, choose::earliest);
+        static_assert(std::is_same<decltype(zts), zoned_time<seconds, TimeZonePtr>>::value, "");
+
+        zoned_time<milliseconds> zms(zs);
+        zoned_time ztms(std::forward<Source>(s), zms, choose::earliest);
+        static_assert(std::is_same<decltype(ztms), zoned_time<milliseconds, TimeZonePtr>>::value, "");
+    }
+}
+
+struct MyString
+{
+  MyString(std::string s) : ms(std::move(s)) {}
+
+  operator std::string_view() const { return ms; }
+
+private:
+  std::string ms;
+};
+
+
+#endif  // HAS_DEDUCTION_GUIDES
+
+template<typename T>
+T const& to_const(T& t) { return t; }
+
+
+int
+main()
+{
+    using namespace date;
+    using namespace std::chrono;
+
+#if HAS_DEDUCTION_GUIDES
+    //  no arguments
+    {
+        zoned_time zt{};
+        static_assert(std::is_same<decltype(zt), zoned_time<seconds>>::value, "");
+    } 
+
+    // zoned_time
+    {
+        zoned_time<days> zd(sys_days(2017_y/feb/20));
+        zoned_time ztd(zd);
+        static_assert(std::is_same<decltype(ztd), zoned_time<days>>::value, "");
+
+        zoned_time<seconds> zs(zd);
+        zoned_time zts(zs);
+        static_assert(std::is_same<decltype(zts), zoned_time<seconds>>::value, "");
+
+        zoned_time<milliseconds> zms(zs);
+        zoned_time ztms(zms);
+        static_assert(std::is_same<decltype(ztms), zoned_time<milliseconds>>::value, "");
+    }
+
+    // sys_time
+    {
+        sys_days sd(2017_y/feb/20);
+        zoned_time ztd(sd);
+        static_assert(std::is_same<decltype(ztd), zoned_time<seconds>>::value, "");
+
+        sys_time<seconds> ss(sd);
+        zoned_time zts(ss);
+        static_assert(std::is_same<decltype(zts), zoned_time<seconds>>::value, "");
+
+        sys_time<milliseconds> sms(ss);
+        zoned_time ztms(sms);
+        static_assert(std::is_same<decltype(ztms), zoned_time<milliseconds>>::value, "");
+    }
+
+    // time_zone const*
+    {
+       time_zone const* tz = current_zone();
+       testDeductionFrom<time_zone const*>(tz);
+       testDeductionFrom<time_zone const*>(to_const(tz));
+       testDeductionFrom<time_zone const*>(std::move(tz));
+    }
+
+    // char const*
+    {
+       char const* tz = "Europe/Warsaw";
+       testDeductionFrom<time_zone const*>(tz);
+       testDeductionFrom<time_zone const*>(to_const(tz));
+       testDeductionFrom<time_zone const*>(std::move(tz));
+    }
+
+    // std::string
+    {
+       std::string tz = "Europe/Warsaw";
+       testDeductionFrom<time_zone const*>(tz);
+       testDeductionFrom<time_zone const*>(to_const(tz));
+       testDeductionFrom<time_zone const*>(std::move(tz));
+    }
+
+    // std::string_view
+    {
+       std::string_view tz = "Europe/Warsaw";
+       testDeductionFrom<time_zone const*>(tz);
+       testDeductionFrom<time_zone const*>(to_const(tz));
+       testDeductionFrom<time_zone const*>(std::move(tz));
+    }
+
+    // MyString
+    {
+       MyString tz("Europe/Warsaw");
+       testDeductionFrom<time_zone const*>(tz);
+       testDeductionFrom<time_zone const*>(to_const(tz));
+       testDeductionFrom<time_zone const*>(std::move(tz));
+    }
+
+#endif  // HAS_DEDUCTION_GUIDES
+}