--- /dev/null
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * 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 GRPC_CORE_LIB_TRANSPORT_TIMEOUT_ENCODING_H
+#define GRPC_CORE_LIB_TRANSPORT_TIMEOUT_ENCODING_H
+
+#include <grpc/support/port_platform.h>
+
+#include <grpc/slice.h>
+#include <grpc/support/time.h>
+
+#include "src/core/lib/gpr/string.h"
+#include "src/core/lib/iomgr/exec_ctx.h"
+
+#define GRPC_HTTP2_TIMEOUT_ENCODE_MIN_BUFSIZE 10
+
+/* Encode/decode timeouts to the GRPC over HTTP/2 format;
+ encoding may round up arbitrarily. If the timeout is larger than about 1157
+ days, it will be capped and "99999999S" will be sent on the wire. */
+void grpc_http2_encode_timeout(grpc_millis timeout, char* buffer);
+int grpc_http2_decode_timeout(const grpc_slice& text, grpc_millis* timeout);
+
+#endif /* GRPC_CORE_LIB_TRANSPORT_TIMEOUT_ENCODING_H */