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diff --git a/Firestore/core/src/firebase/firestore/model/timestamp.h b/Firestore/core/src/firebase/firestore/model/timestamp.h
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+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_MODEL_TIMESTAMP_H_
+#define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_MODEL_TIMESTAMP_H_
+
+#include <stdint.h>
+
+namespace firebase {
+namespace firestore {
+namespace model {
+
+/**
+ * A Timestamp represents an absolute time from the backend at up to nanosecond
+ * precision. A Timestamp is always UTC.
+ */
+class Timestamp {
+ public:
+  /**
+   * Creates a new timestamp with seconds and nanos set to 0.
+   *
+   * PORTING NOTE: This does NOT set to current timestamp by default. To get the
+   * current timestamp, call Timestamp::Now().
+   */
+  Timestamp();
+
+  /**
+   * Creates a new timestamp.
+   *
+   * @param seconds the number of seconds since epoch.
+   * @param nanos the number of nanoseconds after the seconds.
+   */
+  Timestamp(long seconds, int nanos);
+
+  /** Returns a timestamp with the current date / time. */
+  static Timestamp Now();
+
+  long seconds() const {
+    return seconds_;
+  }
+
+  int nanos() const {
+    return nanos_;
+  }
+
+ private:
+  long seconds_;
+  int nanos_;
+};
+
+/** Compares against another Timestamp. */
+inline bool operator<(const Timestamp& lhs, const Timestamp& rhs) {
+  return lhs.seconds() < rhs.seconds() ||
+         (lhs.seconds() == rhs.seconds() && lhs.nanos() < rhs.nanos());
+}
+
+inline bool operator>(const Timestamp& lhs, const Timestamp& rhs) {
+  return rhs < lhs;
+}
+
+inline bool operator>=(const Timestamp& lhs, const Timestamp& rhs) {
+  return !(lhs < rhs);
+}
+
+inline bool operator<=(const Timestamp& lhs, const Timestamp& rhs) {
+  return !(lhs > rhs);
+}
+
+inline bool operator!=(const Timestamp& lhs, const Timestamp& rhs) {
+  return lhs < rhs || lhs > rhs;
+}
+
+inline bool operator==(const Timestamp& lhs, const Timestamp& rhs) {
+  return !(lhs != rhs);
+}
+
+}  // namespace model
+}  // namespace firestore
+}  // namespace firebase
+
+#endif  // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_MODEL_FIELD_VALUE_H_