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diff --git a/src/feature/dircommon/voting_schedule.h b/src/feature/dircommon/voting_schedule.h
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+++ b/src/feature/dircommon/voting_schedule.h
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+/* Copyright (c) 2018-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file voting_schedule.h
+ * \brief Header file for voting_schedule.c.
+ **/
+
+#ifndef TOR_VOTING_SCHEDULE_H
+#define TOR_VOTING_SCHEDULE_H
+
+#include "or/or.h"
+
+/** Scheduling information for a voting interval. */
+typedef struct {
+  /** When do we generate and distribute our vote for this interval? */
+  time_t voting_starts;
+  /** When do we send an HTTP request for any votes that we haven't
+   * been posted yet?*/
+  time_t fetch_missing_votes;
+  /** When do we give up on getting more votes and generate a consensus? */
+  time_t voting_ends;
+  /** When do we send an HTTP request for any signatures we're expecting to
+   * see on the consensus? */
+  time_t fetch_missing_signatures;
+  /** When do we publish the consensus? */
+  time_t interval_starts;
+
+  /* True iff we have generated and distributed our vote. */
+  int have_voted;
+  /* True iff we've requested missing votes. */
+  int have_fetched_missing_votes;
+  /* True iff we have built a consensus and sent the signatures around. */
+  int have_built_consensus;
+  /* True iff we've fetched missing signatures. */
+  int have_fetched_missing_signatures;
+  /* True iff we have published our consensus. */
+  int have_published_consensus;
+
+  /* True iff this voting schedule was set on demand meaning not through the
+   * normal vote operation of a dirauth or when a consensus is set. This only
+   * applies to a directory authority that needs to recalculate the voting
+   * timings only for the first vote even though this object was initilized
+   * prior to voting. */
+  int created_on_demand;
+
+  /** The valid-after time of the last live consensus that filled this voting
+   *  schedule.  It's used to detect outdated voting schedules. */
+  time_t live_consensus_valid_after;
+} voting_schedule_t;
+
+/* Public API. */
+
+extern voting_schedule_t voting_schedule;
+
+void voting_schedule_recalculate_timing(const or_options_t *options,
+                                        time_t now);
+
+time_t voting_schedule_get_start_of_next_interval(time_t now,
+                                                  int interval,
+                                                  int offset);
+time_t voting_schedule_get_next_valid_after_time(void);
+
+#endif /* TOR_VOTING_SCHEDULE_H */
+