diff --git a/ebml/EbmlElement.h b/ebml/EbmlElement.h
index b927263c..4ed36031 100644
--- a/ebml/EbmlElement.h
+++ b/ebml/EbmlElement.h
@@ -175,6 +175,7 @@ extern const EbmlSemanticContext Context_EbmlGlobal;
 #define DEFINE_SEMANTIC_ITEM(m,u,c)  EbmlSemantic(m, u, EBML_INFO(c)),
 #define DEFINE_SEMANTIC_ITEM_UINT(m,u,d,c)      EbmlSemantic(m, u, static_cast<std::uint64_t>(d), EBML_INFO(c)),
 #define DEFINE_SEMANTIC_ITEM_SINT(m,u,d,c)      EbmlSemantic(m, u, static_cast<std::int64_t>(d),  EBML_INFO(c)),
+#define DEFINE_SEMANTIC_ITEM_DATE(m,u,d,c)      EbmlSemantic(m, u, static_cast<std::int64_t>(d,true), EBML_INFO(c)),
 #define DEFINE_SEMANTIC_ITEM_DOUBLE(m,u,d,c)    EbmlSemantic(m, u, static_cast<double>(d),        EBML_INFO(c)),
 #define DEFINE_SEMANTIC_ITEM_STRING(m,u,d,c)    EbmlSemantic(m, u, static_cast<char*>(d),         EBML_INFO(c)),
 #define DEFINE_SEMANTIC_ITEM_UNISTRING(m,u,d,c) EbmlSemantic(m, u, static_cast<wchar_t*>(d),      EBML_INFO(c)),
@@ -355,6 +356,7 @@ class EBML_DLL_API EbmlSemantic {
       NO_DEFAULT,
       UINTEGER,
       SINTEGER,
+      DATE,
       DOUBLE,
       STRING,
       UNISTRING,
@@ -371,7 +373,7 @@ class EBML_DLL_API EbmlSemantic {
       constexpr DefaultValues(void) : u64(0), type(DefaultType::NO_DEFAULT) {}
       constexpr DefaultValues(const DefaultValues &) = default;
       constexpr DefaultValues(std::uint64_t u) : u64(u), type(DefaultType::UINTEGER) {}
-      constexpr DefaultValues(std::int64_t u) : u64(u), type(DefaultType::UINTEGER) {}
+      constexpr DefaultValues(std::int64_t u, bool date = false) : i64(u), type(date ? DefaultType::UINTEGER : DefaultType::DATE) {}
       constexpr DefaultValues(double d) : f(d), type(DefaultType::DOUBLE) {}
       constexpr DefaultValues(const char *d) : s(d), type(DefaultType::STRING) {}
       constexpr DefaultValues(const wchar_t *d) : ws(d), type(DefaultType::UNISTRING) {}