diff --git a/toml/datetime.hpp b/toml/datetime.hpp
index f0ae405..4ea75e7 100644
--- a/toml/datetime.hpp
+++ b/toml/datetime.hpp
@@ -46,7 +46,7 @@ inline std::tm localtime_s(const std::time_t* src)
 #endif
 } // detail
 
-enum class month_t : std::int8_t
+enum class month_t : std::uint8_t
 {
     Jan =  0,
     Feb =  1,
@@ -98,9 +98,9 @@ struct local_date
         t.tm_sec   = 0;
         t.tm_min   = 0;
         t.tm_hour  = 0;
-        t.tm_mday  = this->day;
-        t.tm_mon   = this->month;
-        t.tm_year  = this->year - 1900;
+        t.tm_mday  = static_cast<int>(this->day);
+        t.tm_mon   = static_cast<int>(this->month);
+        t.tm_year  = static_cast<int>(this->year) - 1900;
         t.tm_wday  = 0; // the value will be ignored
         t.tm_yday  = 0; // the value will be ignored
         t.tm_isdst = -1;
diff --git a/toml/parser.hpp b/toml/parser.hpp
index 1b76503..8e8a7ef 100644
--- a/toml/parser.hpp
+++ b/toml/parser.hpp
@@ -660,9 +660,9 @@ parse_local_time(location<Container>& loc)
                 {{std::addressof(inner_loc), "here"}}));
         }
         local_time time(
-            static_cast<std::int8_t>(from_string<int>(h.unwrap().str(), 0)),
-            static_cast<std::int8_t>(from_string<int>(m.unwrap().str(), 0)),
-            static_cast<std::int8_t>(from_string<int>(s.unwrap().str(), 0)), 0, 0);
+            from_string<int>(h.unwrap().str(), 0),
+            from_string<int>(m.unwrap().str(), 0),
+            from_string<int>(s.unwrap().str(), 0), 0, 0);
 
         const auto before_secfrac = inner_loc.iter();
         if(const auto secfrac = lex_time_secfrac::invoke(inner_loc))
@@ -678,13 +678,13 @@ parse_local_time(location<Container>& loc)
             }
             if(sf.size() >= 6)
             {
-                time.millisecond = from_string<std::int16_t>(sf.substr(0, 3), 0);
-                time.microsecond = from_string<std::int16_t>(sf.substr(3, 3), 0);
+                time.millisecond = from_string<std::uint16_t>(sf.substr(0, 3), 0u);
+                time.microsecond = from_string<std::uint16_t>(sf.substr(3, 3), 0u);
             }
             else if(sf.size() >= 3)
             {
-                time.millisecond = from_string<std::int16_t>(sf, 0);
-                time.microsecond = 0;
+                time.millisecond = from_string<std::uint16_t>(sf, 0u);
+                time.microsecond = 0u;
             }
         }
         else