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diff --git a/src/ceph/src/common/iso_8601.h b/src/ceph/src/common/iso_8601.h
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+++ b/src/ceph/src/common/iso_8601.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_COMMON_ISO_8601_H
+#define CEPH_COMMON_ISO_8601_H
+
+#include <boost/utility/string_ref.hpp>
+
+#include "common/ceph_time.h"
+
+namespace ceph {
+
+// Here, we support the W3C profile of ISO 8601 with the following
+// restrictions:
+// -   Subsecond resolution is supported to nanosecond
+//     granularity. Any number of digits between 1 and 9 may be
+//     specified after the decimal point.
+// -   All times must be UTC.
+// -   All times must be representable as a sixty-four bit count of
+//     nanoseconds since the epoch.
+// -   Partial times are handled thus:
+//     *    If there are no subseconds, they are assumed to be zero.
+//     *    If there are no seconds, they are assumed to be zero.
+//     *    If there are no minutes, they are assumed to be zero.
+//     *    If there is no time, it is assumed to midnight.
+//     *    If there is no day, it is assumed to be the first.
+//     *    If there is no month, it is assumed to be January.
+//
+// If a date is invalid, boost::none is returned.
+
+boost::optional<ceph::real_time> from_iso_8601(
+  boost::string_ref s, const bool ws_terminates = true) noexcept;
+
+enum class iso_8601_format {
+  Y, YM, YMD, YMDh, YMDhm, YMDhms, YMDhmsn
+};
+
+std::string to_iso_8601(const ceph::real_time t,
+			const iso_8601_format f = iso_8601_format::YMDhmsn)
+  noexcept;
+}
+
+#endif