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diff --git a/grpc/src/core/lib/gprpp/time_util.h b/grpc/src/core/lib/gprpp/time_util.h
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+//
+// Copyright 2021 the 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_GPRPP_TIME_UTIL_H
+#define GRPC_CORE_LIB_GPRPP_TIME_UTIL_H
+
+#include <grpc/support/port_platform.h>
+
+#include <grpc/support/time.h>
+
+#include "absl/time/time.h"
+
+namespace grpc_core {
+
+// Converts absl::Duration to gpr_timespec(GPR_TIMESPAN)
+gpr_timespec ToGprTimeSpec(absl::Duration duration);
+
+// Converts absl::Time to gpr_timespec(GPR_CLOCK_REALTIME)
+gpr_timespec ToGprTimeSpec(absl::Time time);
+
+// Converts gpr_timespec(GPR_TIMESPAN) to absl::Duration
+absl::Duration ToAbslDuration(gpr_timespec ts);
+
+// Converts gpr_timespec(GPR_CLOCK_[MONOTONIC|REALTIME|PRECISE]) to absl::Time
+absl::Time ToAbslTime(gpr_timespec ts);
+
+}  // namespace grpc_core
+
+#endif  // GRPC_CORE_LIB_GPRPP_TIME_UTIL_H