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diff --git a/subprojects/exess/src/time_utils.h b/subprojects/exess/src/time_utils.h
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+++ b/subprojects/exess/src/time_utils.h
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+/*
+  Copyright 2019-2021 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef EXESS_TIME_UTILS_H
+#define EXESS_TIME_UTILS_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/// Read fractional digits as an integer number of nanoseconds
+ExessResult
+read_nanoseconds(uint32_t* out, const char* str);
+
+/// Write nanoseconds as fractional digits
+size_t
+write_nanoseconds(uint32_t nanosecond, size_t buf_size, char* buf, size_t i);
+
+/// Write a complete time with timezone suffix if necessary
+ExessResult
+write_time(ExessTime value, size_t buf_size, char* buf, size_t offset);
+
+#endif // EXESS_TIME_UTILS_H