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diff --git a/src/systemc/ext/core/sc_time.hh b/src/systemc/ext/core/sc_time.hh
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+/*
+ * Copyright 2018 Google, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __SYSTEMC_EXT_CORE_SC_TIME_HH__
+#define __SYSTEMC_EXT_CORE_SC_TIME_HH__
+
+#include <stdint.h>
+
+#include <iostream>
+
+#include "../dt/int/sc_nbdefs.hh"
+
+namespace sc_core
+{
+
+enum sc_time_unit {
+    SC_FS = 0,
+    SC_PS,
+    SC_NS,
+    SC_US,
+    SC_MS,
+    SC_SEC
+};
+
+class sc_time
+{
+  public:
+    sc_time();
+    sc_time(double, sc_time_unit);
+    sc_time(const sc_time &);
+
+    sc_time &operator = (const sc_time &);
+
+    sc_dt::uint64 value() const;
+    double to_double() const;
+    double to_seconds() const;
+    const std::string to_string() const;
+
+    bool operator == (const sc_time &) const;
+    bool operator != (const sc_time &) const;
+    bool operator < (const sc_time &) const;
+    bool operator <= (const sc_time &) const;
+    bool operator > (const sc_time &) const;
+    bool operator >= (const sc_time &) const;
+
+    sc_time &operator += (const sc_time &);
+    sc_time &operator -= (const sc_time &);
+    sc_time &operator *= (double);
+    sc_time &operator /= (double);
+
+    void print(std::ostream & =std::cout) const;
+};
+
+const sc_time operator + (const sc_time &, const sc_time &);
+const sc_time operator - (const sc_time &, const sc_time &);
+
+const sc_time operator * (const sc_time &, double);
+const sc_time operator * (double, const sc_time &);
+const sc_time operator / (const sc_time &, double);
+double operator / (const sc_time &, const sc_time &);
+
+std::ostream &operator << (std::ostream &, const sc_time &);
+
+extern const sc_time SC_ZERO_TIME;
+
+void sc_set_time_resolution(double, sc_time_unit);
+sc_time sc_get_time_resolution();
+const sc_time &sc_max_time();
+
+} // namespace sc_core
+
+#endif  //__SYSTEMC_EXT_CORE_SC_TIME_HH__