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diff --git a/brillo/timezone/tzif_parser.h b/brillo/timezone/tzif_parser.h
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+// Copyright 2020 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LIBBRILLO_BRILLO_TIMEZONE_TZIF_PARSER_H_
+#define LIBBRILLO_BRILLO_TIMEZONE_TZIF_PARSER_H_
+
+#include <string>
+
+#include <base/files/file_path.h>
+#include <base/optional.h>
+#include <brillo/brillo_export.h>
+
+namespace brillo {
+
+namespace timezone {
+
+// GetPosixTimezone takes a path to a tzfile, and returns the POSIX timezone in
+// a string. See 'man tzfile' for more info on the format. If |tzif_path| is a
+// relative path, it will be appended to /usr/share/zoneinfo/, otherwise
+// |tzif_path| as an absolute path will be used directly.
+base::Optional<std::string> BRILLO_EXPORT GetPosixTimezone(
+        const base::FilePath& tzif_path);
+
+}  // namespace timezone
+
+}  // namespace brillo
+
+#endif  // LIBBRILLO_BRILLO_TIMEZONE_TZIF_PARSER_H_