diff --git a/test/tz_test/local_time_conversion.pass.cpp b/test/tz_test/local_time_conversion.pass.cpp
index d47c71f..59bcdbf 100644
--- a/test/tz_test/local_time_conversion.pass.cpp
+++ b/test/tz_test/local_time_conversion.pass.cpp
@@ -5,7 +5,6 @@ int
 main()
 {
    using namespace date;
-   using namespace std::chrono_literals;
    using namespace std::chrono;
 
    /// sys epoch 
@@ -13,7 +12,7 @@ main()
      auto ls = local_days{1970_y/01/01_d};
      auto st = clock_cast<system_clock>(ls);
      assert(clock_cast<local_t>(st) == ls);
-     assert(st.time_since_epoch() == 0s);
+     assert(st.time_since_epoch() == seconds(0));
    }
 
    /// sys 2000 case 
@@ -21,7 +20,7 @@ main()
      auto ls = local_days{2000_y/01/01_d};
      auto st = clock_cast<system_clock>(ls);
      assert(clock_cast<local_t>(st) == ls);
-     assert(st.time_since_epoch() == 946'684'800s);
+     assert(st.time_since_epoch() == seconds(946684800));
    }
 
 
@@ -30,7 +29,7 @@ main()
      auto lu = local_days{1970_y/01/01_d};
      auto ut = clock_cast<utc_clock>(lu);
      assert(clock_cast<local_t>(ut) == lu);
-     assert(ut.time_since_epoch() == 0s);
+     assert(ut.time_since_epoch() == seconds(0));
    }
 
    /// utc paper example 
@@ -38,7 +37,7 @@ main()
      auto lu = local_days{2000_y/01/01_d};
      auto ut = clock_cast<utc_clock>(lu);
      assert(clock_cast<local_t>(ut) == lu);
-     assert(ut.time_since_epoch() == 946'684'822s);
+     assert(ut.time_since_epoch() == seconds(946684822));
    }
 
    /// tai epoch
@@ -46,16 +45,16 @@ main()
      auto lt = local_days{1958_y/01/01_d};
      auto tt = clock_cast<tai_clock>(lt);
      assert(clock_cast<local_t>(tt) == lt);
-     assert(tt.time_since_epoch() == 0s);
+     assert(tt.time_since_epoch() == seconds(0));
 
-     auto lu = local_days{1957_y/12/31_d} + 23h + 59min + 50s;
+     auto lu = local_days{1958_y/01/01_d} - seconds(10);
      auto ut = clock_cast<utc_clock>(lu);
      assert(clock_cast<tai_clock>(ut) == tt);
    }
 
    // tai paper example
    {
-      auto lt = local_days{2000_y/01/01_d} + 32s;
+      auto lt = local_days{2000_y/01/01_d} + seconds(32);
       auto tt = clock_cast<tai_clock>(lt);
       assert(clock_cast<local_t>(tt) == lt);
 
@@ -69,13 +68,13 @@ main()
      auto lg = local_days{1980_y/01/Sunday[1]};
      auto gt = clock_cast<gps_clock>(lg);
      assert(clock_cast<local_t>(gt) == lg);
-     assert(gt.time_since_epoch() == 0s);
+     assert(gt.time_since_epoch() == seconds(0));
 
      auto lu = local_days{1980_y/01/Sunday[1]};
      auto ut = clock_cast<utc_clock>(lu);
      assert(clock_cast<gps_clock>(ut) == gt);
 
-     auto lt = local_days{1980_y/01/Sunday[1]} + 19s;
+     auto lt = local_days{1980_y/01/Sunday[1]} + seconds(19);
      auto tt = clock_cast<tai_clock>(lt);
      assert(clock_cast<gps_clock>(tt) == gt);
    }
@@ -86,11 +85,11 @@ main()
      auto gt = clock_cast<gps_clock>(lg);
      assert(clock_cast<local_t>(gt) == lg);
 
-     auto lu = local_days{2000_y/01/01_d} - 13s;
+     auto lu = local_days{2000_y/01/01_d} - seconds(13);
      auto ut = clock_cast<utc_clock>(lu);
      assert(clock_cast<gps_clock>(ut) == gt);
 
-     auto lt = local_days{2000_y/01/01_d} + 19s;
+     auto lt = local_days{2000_y/01/01_d} + seconds(19);
      auto tt = clock_cast<tai_clock>(lt);
      assert(clock_cast<gps_clock>(tt) == gt);
    }