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diff --git a/src/mongo/db/timeseries/timeseries_extended_range.h b/src/mongo/db/timeseries/timeseries_extended_range.h
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+/**
+ *    Copyright (C) 2022-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#pragma once
+
+#include "mongo/bson/bsonobj.h"
+#include "mongo/db/catalog/collection.h"
+#include "mongo/db/timeseries/timeseries_gen.h"
+
+namespace mongo::timeseries {
+
+/**
+ * Determines whether the given 'date' is outside the standard supported range and requires extended
+ * range support. Standard range dates can be expressed as a number of seconds since the Unix epoch
+ * in 31 unsigned bits.
+ */
+bool dateOutsideStandardRange(Date_t date);
+
+/**
+ * Determines whether any of the given buckets have control.min.timeField values that lie outside
+ * the standard range.
+ */
+bool bucketsHaveDateOutsideStandardRange(const TimeseriesOptions& options,
+                                         std::vector<InsertStatement>::const_iterator first,
+                                         std::vector<InsertStatement>::const_iterator last);
+
+/**
+ * Uses a heuristic to determine whether a given time-series collection may contain measurements
+ * with dates that fall outside the standard range.
+ */
+bool collectionMayRequireExtendedRangeSupport(OperationContext* opCtx,
+                                              const CollectionPtr& collection);
+
+/**
+ * Determines whether a time-series collection has an index primarily ordered by a time field. This
+ * excludes the clustered index, and is testing specifically if an index's key pattern's first field
+ * is either control.min.<timeField> or control.max.<timeField>.
+ */
+bool collectionHasTimeIndex(OperationContext* opCtx, const Collection& collection);
+
+}  // namespace mongo::timeseries