diff --git a/vhdlpp/expression.cc b/vhdlpp/expression.cc
index 949d568ae..7886618ee 100644
--- a/vhdlpp/expression.cc
+++ b/vhdlpp/expression.cc
@@ -564,3 +564,25 @@ ExpNew::~ExpNew()
 {
     delete size_;
 }
+
+ExpTime::ExpTime(uint64_t amount, timeunit_t unit)
+: amount_(amount), unit_(unit)
+{
+}
+
+double ExpTime::to_fs() const
+{
+    double val = amount_;
+
+    switch(unit_) {
+        case FS: break;
+        case PS: val *= 1e3; break;
+        case NS: val *= 1e6; break;
+        case US: val *= 1e9; break;
+        case MS: val *= 1e12; break;
+        case S:  val *= 1e15; break;
+        default: ivl_assert(*this, false); break;
+    }
+
+    return val;
+}
diff --git a/vhdlpp/expression.h b/vhdlpp/expression.h
index 7d5f47ee6..717b1e116 100644
--- a/vhdlpp/expression.h
+++ b/vhdlpp/expression.h
@@ -838,4 +838,26 @@ class ExpNew : public Expression {
       Expression*size_;
 };
 
+class ExpTime : public Expression {
+    public:
+        typedef enum { FS, PS, NS, US, MS, S } timeunit_t;
+
+        ExpTime(uint64_t amount, timeunit_t unit);
+
+        Expression*clone() const { return new ExpTime(amount_, unit_); }
+
+        int elaborate_expr(Entity*ent, ScopeBase*scope, const VType*ltype);
+        void write_to_stream(std::ostream&) const;
+        int emit(ostream&out, Entity*ent, ScopeBase*scope);
+        bool evaluate(ScopeBase*scope, int64_t&val) const;
+        bool evaluate(Entity*ent, ScopeBase*scope, int64_t&val) const;
+        void dump(ostream&out, int indent = 0) const;
+
+    private:
+        // Returns the time value expressed in femtoseconds
+        double to_fs() const;
+        uint64_t amount_;
+        timeunit_t unit_;
+};
+
 #endif /* IVL_expression_H */
diff --git a/vhdlpp/expression_debug.cc b/vhdlpp/expression_debug.cc
index 1a7b44e8c..fd52b6875 100644
--- a/vhdlpp/expression_debug.cc
+++ b/vhdlpp/expression_debug.cc
@@ -112,3 +112,8 @@ void ExpShift::dump(ostream&out, int indent) const
       dump_operands(out, indent+4);
 }
 
+void ExpTime::dump(ostream&out, int indent) const
+{
+      out << setw(indent) << "" << "Time ";
+      write_to_stream(out);
+}
diff --git a/vhdlpp/expression_elaborate.cc b/vhdlpp/expression_elaborate.cc
index 30985fa53..71cda7c97 100644
--- a/vhdlpp/expression_elaborate.cc
+++ b/vhdlpp/expression_elaborate.cc
@@ -1133,3 +1133,10 @@ int ExpUNot::elaborate_expr(Entity*, ScopeBase*, const VType*ltype)
       set_type(ltype);
       return 0;
 }
+
+
+int ExpTime::elaborate_expr(Entity*, ScopeBase*, const VType*)
+{
+      set_type(&primitive_INTEGER);
+      return 0;
+}
diff --git a/vhdlpp/expression_emit.cc b/vhdlpp/expression_emit.cc
index b0ccefc5e..e7263e406 100644
--- a/vhdlpp/expression_emit.cc
+++ b/vhdlpp/expression_emit.cc
@@ -1068,3 +1068,19 @@ int ExpNew::emit(ostream&out, Entity*ent, ScopeBase*scope)
       out << "]";
       return errors;
 }
+
+int ExpTime::emit(ostream&out, Entity*, ScopeBase*)
+{
+      out << amount_;
+
+      switch(unit_) {
+          case FS: out << "fs"; break;
+          case PS: out << "ps"; break;
+          case NS: out << "ns"; break;
+          case US: out << "us"; break;
+          case MS: out << "ms"; break;
+          case S:  out << "s"; break;
+      }
+
+      return 0;
+}
diff --git a/vhdlpp/expression_evaluate.cc b/vhdlpp/expression_evaluate.cc
index 54bf704b4..2e26ba502 100644
--- a/vhdlpp/expression_evaluate.cc
+++ b/vhdlpp/expression_evaluate.cc
@@ -22,6 +22,7 @@
 # include  "expression.h"
 # include  "architec.h"
 # include  <ivl_assert.h>
+# include  <limits>
 
 bool Expression::evaluate(ScopeBase*, int64_t&) const
 {
@@ -245,3 +246,22 @@ bool ExpShift::evaluate(ScopeBase*scope, int64_t&val) const
 
       return true;
 }
+
+bool ExpTime::evaluate(ScopeBase*, int64_t&val) const
+{
+    double v = to_fs();
+
+    if(v > std::numeric_limits<int64_t>::max()) {
+        val = std::numeric_limits<int64_t>::max();
+        cerr << get_fileline() << ": sorry: Time value is higher than the "
+             << "handled limit, reduced to " << val << " fs." << endl;
+    }
+
+    val = v;
+    return true;
+}
+
+bool ExpTime::evaluate(Entity*, ScopeBase*, int64_t&val) const
+{
+    return evaluate(NULL, NULL, val);
+}
diff --git a/vhdlpp/expression_stream.cc b/vhdlpp/expression_stream.cc
index c379795bf..1321a3740 100644
--- a/vhdlpp/expression_stream.cc
+++ b/vhdlpp/expression_stream.cc
@@ -297,3 +297,17 @@ void ExpCast::write_to_stream(ostream&fd) const
       // SystemVerilog, so no need to use it here
       base_->write_to_stream(fd);
 }
+
+void ExpTime::write_to_stream(ostream&fd) const
+{
+      fd << amount_;
+
+      switch(unit_) {
+          case FS: fd << " fs"; break;
+          case PS: fd << " ps"; break;
+          case NS: fd << " ns"; break;
+          case US: fd << " us"; break;
+          case MS: fd << " ms"; break;
+          case S:  fd << " s"; break;
+      }
+}
diff --git a/vhdlpp/lexor.lex b/vhdlpp/lexor.lex
index c9dae5c51..1cbda23c9 100644
--- a/vhdlpp/lexor.lex
+++ b/vhdlpp/lexor.lex
@@ -84,6 +84,7 @@ exponent			[eE][-+]?{integer}
 
 based_literal		{integer}#{based_integer}(\.{based_integer})?#{exponent}?
 based_integer		[0-9a-fA-F](_?[0-9a-fA-F])*
+time			{integer}{W}*([fFpPnNuUmM]?[sS])
 %%
 
 [ \t\b\f\r] { ; }
diff --git a/vhdlpp/library.cc b/vhdlpp/library.cc
index fda670a34..b0594c38d 100644
--- a/vhdlpp/library.cc
+++ b/vhdlpp/library.cc
@@ -391,6 +391,7 @@ const VTypePrimitive primitive_NATURAL(VTypePrimitive::NATURAL);
 const VTypePrimitive primitive_REAL(VTypePrimitive::REAL);
 const VTypePrimitive primitive_STDLOGIC(VTypePrimitive::STDLOGIC, true);
 const VTypePrimitive primitive_CHARACTER(VTypePrimitive::CHARACTER);
+const VTypePrimitive primitive_TIME(VTypePrimitive::TIME);
 
 static const VTypeArray primitive_BIT_VECTOR(&primitive_BIT,      vector<VTypeArray::range_t> (1));
 static const VTypeArray primitive_BOOL_VECTOR(&primitive_BOOLEAN, vector<VTypeArray::range_t> (1));
@@ -407,6 +408,7 @@ void generate_global_types(ActiveScope*res)
       res->use_name(perm_string::literal("bit_vector"),&primitive_BIT_VECTOR);
       res->use_name(perm_string::literal("string"),    &primitive_STRING);
       res->use_name(perm_string::literal("natural"),   &primitive_NATURAL);
+      res->use_name(perm_string::literal("time"),      &primitive_TIME);
 }
 
 void emit_std_types(ostream&out)
@@ -431,6 +433,7 @@ bool is_global_type(perm_string name)
       if (name == "natural") return true;
       if (name == "signed") return true;
       if (name == "unsigned") return true;
+      if (name == "time") return true;
       return false;
 }
 
diff --git a/vhdlpp/parse.y b/vhdlpp/parse.y
index c3a4e2ab9..7b3b4212b 100644
--- a/vhdlpp/parse.y
+++ b/vhdlpp/parse.y
@@ -1835,6 +1835,32 @@ primary
 	delete[]$1;
 	$$ = tmp;
       }
+  | INT_LITERAL IDENTIFIER
+      { ExpTime::timeunit_t unit = ExpTime::FS;
+
+        if(!strcasecmp($2, "us"))
+            unit = ExpTime::US;
+        else if(!strcasecmp($2, "ms"))
+            unit = ExpTime::MS;
+        else if(!strcasecmp($2, "ns"))
+            unit = ExpTime::NS;
+        else if(!strcasecmp($2, "s"))
+            unit = ExpTime::S;
+        else if(!strcasecmp($2, "ps"))
+            unit = ExpTime::PS;
+        else if(!strcasecmp($2, "fs"))
+            unit = ExpTime::FS;
+        else
+            errormsg(@2, "Invalid time unit (accepted are fs, ps, ns, us, ms, s).");
+
+        if($1 < 0)
+            errormsg(@1, "Time cannot be negative.");
+
+        ExpTime*tmp = new ExpTime($1, unit);
+        FILE_NAME(tmp, @1);
+        delete[] $2;
+        $$ = tmp;
+      }
 
 /*XXXX Caught up in element_association_list?
   | '(' expression ')'
diff --git a/vhdlpp/vtype.cc b/vhdlpp/vtype.cc
index ee43570e7..4dc97199a 100644
--- a/vhdlpp/vtype.cc
+++ b/vhdlpp/vtype.cc
@@ -76,6 +76,9 @@ void VTypePrimitive::show(ostream&out) const
 	  case STDLOGIC:
 	    out << "STD_LOGIC";
 	    break;
+	  case TIME:
+	    out << "TIME";
+	    break;
       }
 }
 
diff --git a/vhdlpp/vtype.h b/vhdlpp/vtype.h
index 62b528240..0756ff68b 100644
--- a/vhdlpp/vtype.h
+++ b/vhdlpp/vtype.h
@@ -156,7 +156,7 @@ class VTypeERROR : public VType {
 class VTypePrimitive : public VType {
 
     public:
-      enum type_t { BOOLEAN, BIT, INTEGER, NATURAL, REAL, STDLOGIC, CHARACTER };
+      enum type_t { BOOLEAN, BIT, INTEGER, NATURAL, REAL, STDLOGIC, CHARACTER, TIME };
 
     public:
       VTypePrimitive(type_t tt, bool packed = false);
@@ -187,6 +187,7 @@ extern const VTypePrimitive primitive_NATURAL;
 extern const VTypePrimitive primitive_REAL;
 extern const VTypePrimitive primitive_STDLOGIC;
 extern const VTypePrimitive primitive_CHARACTER;
+extern const VTypePrimitive primitive_TIME;
 
 /*
  * An array is a compound N-dimensional array of element type. The
diff --git a/vhdlpp/vtype_emit.cc b/vhdlpp/vtype_emit.cc
index b97d00d7e..cfb8f6390 100644
--- a/vhdlpp/vtype_emit.cc
+++ b/vhdlpp/vtype_emit.cc
@@ -169,6 +169,9 @@ int VTypePrimitive::emit_primitive_type(ostream&out) const
 	  case CHARACTER:
 	    out << "char";
 	    break;
+	  case TIME:
+	    out << "time";
+	    break;
 	  default:
 	    assert(0);
 	    break;
diff --git a/vhdlpp/vtype_stream.cc b/vhdlpp/vtype_stream.cc
index 2cf159db8..9f8b6c689 100644
--- a/vhdlpp/vtype_stream.cc
+++ b/vhdlpp/vtype_stream.cc
@@ -168,6 +168,9 @@ void VTypePrimitive::write_to_stream(ostream&fd) const
 	  case BOOLEAN:
 	    fd << "boolean";
 	    break;
+	  case TIME:
+	    fd << "time";
+	    break;
 	  default:
 	    assert(0);
 	    fd << "/* PRIMITIVE: " << type_ << " */";