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diff --git a/modules/md/md_time.h b/modules/md/md_time.h
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 mod_md_md_time_h
+#define mod_md_md_time_h
+
+#include <stdio.h>
+
+#define MD_SECS_PER_HOUR      (60*60)
+#define MD_SECS_PER_DAY       (24*MD_SECS_PER_HOUR)
+
+typedef struct md_timeperiod_t md_timeperiod_t;
+
+struct md_timeperiod_t {
+    apr_time_t start;
+    apr_time_t end;
+};
+
+apr_time_t md_timeperiod_length(const md_timeperiod_t *period);
+
+int md_timeperiod_contains(const md_timeperiod_t *period, apr_time_t time);
+int md_timeperiod_has_started(const md_timeperiod_t *period, apr_time_t time);
+int md_timeperiod_has_ended(const md_timeperiod_t *period, apr_time_t time);
+apr_interval_time_t md_timeperiod_remaining(const md_timeperiod_t *period, apr_time_t time);
+
+/**
+ * Return the timeperiod common between a and b. If both do not overlap, return {0,0}.
+ */
+md_timeperiod_t md_timeperiod_common(const md_timeperiod_t *a, const md_timeperiod_t *b);
+
+char *md_timeperiod_print(apr_pool_t *p, const md_timeperiod_t *period);
+
+/**
+ * Print a human readable form of the give duration in days/hours/min/sec 
+ */
+const char *md_duration_print(apr_pool_t *p, apr_interval_time_t duration);
+const char *md_duration_roughly(apr_pool_t *p, apr_interval_time_t duration);
+
+/**
+ * Parse a machine readable string duration in the form of NN[unit], where
+ * unit is d/h/mi/s/ms with the default given should the unit not be specified.
+ */
+apr_status_t md_duration_parse(apr_interval_time_t *ptimeout, const char *value, 
+                               const char *def_unit);
+const char *md_duration_format(apr_pool_t *p, apr_interval_time_t duration);
+
+typedef struct {
+    apr_interval_time_t norm; /* if > 0, normalized base length */
+    apr_interval_time_t len;  /* length of the timespan */
+} md_timeslice_t;
+
+apr_status_t md_timeslice_create(md_timeslice_t **pts, apr_pool_t *p,
+                                 apr_interval_time_t norm, apr_interval_time_t len); 
+
+int md_timeslice_eq(const md_timeslice_t *ts1, const md_timeslice_t *ts2);
+
+const char *md_timeslice_parse(md_timeslice_t **pts, apr_pool_t *p, 
+                              const char *val, apr_interval_time_t defnorm);
+const char *md_timeslice_format(const md_timeslice_t *ts, apr_pool_t *p);
+
+md_timeperiod_t md_timeperiod_slice_before_end(const md_timeperiod_t *period, 
+                                               const md_timeslice_t *ts);
+
+#endif /* md_util_h */