diff --git a/cros/omaha_utils.cc b/cros/omaha_utils.cc
new file mode 100644
index 0000000..fc05cb9
--- /dev/null
+++ b/cros/omaha_utils.cc
@@ -0,0 +1,37 @@
+//
+// 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.
+//
+
+#include "update_engine/cros/omaha_utils.h"
+
+#include <base/logging.h>
+#include <base/strings/string_number_conversions.h>
+
+namespace chromeos_update_engine {
+
+const EolDate kEolDateInvalid = -9999;
+
+std::string EolDateToString(EolDate eol_date) {
+  return base::NumberToString(eol_date);
+}
+
+EolDate StringToEolDate(const std::string& eol_date) {
+  EolDate date = kEolDateInvalid;
+  if (!base::StringToInt64(eol_date, &date))
+    return kEolDateInvalid;
+  return date;
+}
+
+}  // namespace chromeos_update_engine