diff --git a/cros/omaha_utils.h b/cros/omaha_utils.h
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+//
+// Copyright (C) 2016 The Android Open Source Project
+//
+// 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 UPDATE_ENGINE_CROS_OMAHA_UTILS_H_
+#define UPDATE_ENGINE_CROS_OMAHA_UTILS_H_
+
+#include <string>
+
+namespace chromeos_update_engine {
+
+using EolDate = int64_t;
+
+// |EolDate| indicating an invalid end-of-life date.
+extern const EolDate kEolDateInvalid;
+
+// Returns the string representation of the |eol_date|.
+std::string EolDateToString(EolDate eol_date);
+
+// Converts the end-of-life date string to an EolDate numeric value. In case
+// of an invalid string, the default |kEolDateInvalid| value will be used
+// instead.
+EolDate StringToEolDate(const std::string& eol_date);
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_CROS_OMAHA_UTILS_H_