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diff --git a/intl/icu/source/i18n/zonemeta.h b/intl/icu/source/i18n/zonemeta.h
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+++ b/intl/icu/source/i18n/zonemeta.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2007-2013, International Business Machines Corporation and    *
+* others. All Rights Reserved.                                                *
+*******************************************************************************
+*/
+#ifndef ZONEMETA_H
+#define ZONEMETA_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/unistr.h"
+#include "hash.h"
+
+U_NAMESPACE_BEGIN
+
+struct OlsonToMetaMappingEntry : public UMemory {
+    const char16_t *mzid; // const because it's a reference to a resource bundle string.
+    UDate from;
+    UDate to;
+};
+
+class UVector;
+class TimeZone;
+
+class U_I18N_API ZoneMeta {
+public:
+    /**
+     * Return the canonical id for this tzid defined by CLDR, which might be the id itself.
+     * If the given system tzid is not known, U_ILLEGAL_ARGUMENT_ERROR is set in the status.
+     *
+     * Note: this internal API supports all known system IDs and "Etc/Unknown" (which is
+     * NOT a system ID).
+     */
+    static UnicodeString& U_EXPORT2 getCanonicalCLDRID(const UnicodeString &tzid, UnicodeString &systemID, UErrorCode& status);
+
+    /**
+     * Return the canonical id for this tzid defined by CLDR, which might be the id itself.
+     * This overload method returns a persistent const char16_t*, which is guaranteed to persist
+     * (a pointer to a resource). If the given system tzid is not known, U_ILLEGAL_ARGUMENT_ERROR
+     * is set in the status.
+     * @param tzid Zone ID
+     * @param status Receives the status
+     * @return The canonical ID for the input time zone ID
+     */
+    static const char16_t* U_EXPORT2 getCanonicalCLDRID(const UnicodeString &tzid, UErrorCode& status);
+
+    /*
+     * Convenient method returning CLDR canonical ID for the given time zone
+     */
+    static const char16_t* U_EXPORT2 getCanonicalCLDRID(const TimeZone& tz);
+
+    /**
+     * Return the canonical country code for this tzid.  If we have none, or if the time zone
+     * is not associated with a country, return bogus string.
+     * @param tzid Zone ID
+     * @param country [output] Country code
+     * @param isPrimary [output] true if the zone is the primary zone for the country
+     * @return A reference to the result country
+     */
+    static UnicodeString& U_EXPORT2 getCanonicalCountry(const UnicodeString &tzid, UnicodeString &country, UBool *isPrimary = nullptr);
+
+    /**
+     * Returns a CLDR metazone ID for the given Olson tzid and time.
+     */
+    static UnicodeString& U_EXPORT2 getMetazoneID(const UnicodeString &tzid, UDate date, UnicodeString &result);
+    /**
+     * Returns an Olson ID for the ginve metazone and region
+     */
+    static UnicodeString& U_EXPORT2 getZoneIdByMetazone(const UnicodeString &mzid, const UnicodeString &region, UnicodeString &result);
+
+    static const UVector* U_EXPORT2 getMetazoneMappings(const UnicodeString &tzid);
+
+    static const UVector* U_EXPORT2 getAvailableMetazoneIDs();
+
+    /**
+     * Returns the pointer to the persistent time zone ID string, or nullptr if the given tzid is not in the
+     * tz database. This method is useful when you maintain persistent zone IDs without duplication.
+     */
+    static const char16_t* U_EXPORT2 findTimeZoneID(const UnicodeString& tzid);
+
+    /**
+     * Returns the pointer to the persistent meta zone ID string, or nullptr if the given mzid is not available.
+     * This method is useful when you maintain persistent meta zone IDs without duplication.
+     */
+    static const char16_t* U_EXPORT2 findMetaZoneID(const UnicodeString& mzid);
+
+    /**
+     * Creates a custom zone for the offset
+     * @param offset GMT offset in milliseconds
+     * @return A custom TimeZone for the offset with normalized time zone id
+     */
+    static TimeZone* createCustomTimeZone(int32_t offset);
+
+    /**
+     * Returns the time zone's short ID (null terminated) for the zone.
+     * For example, "uslax" for zone "America/Los_Angeles".
+     * @param tz the time zone
+     * @return the short ID of the time zone, or null if the short ID is not available.
+     */
+    static const char16_t* U_EXPORT2 getShortID(const TimeZone& tz);
+
+    /**
+     * Returns the time zone's short ID (null terminated) for the zone ID.
+     * For example, "uslax" for zone ID "America/Los_Angeles".
+     * @param tz the time zone ID
+     * @return the short ID of the time zone ID, or null if the short ID is not available.
+     */
+    static const char16_t* U_EXPORT2 getShortID(const UnicodeString& id);
+
+private:
+    ZoneMeta() = delete; // Prevent construction.
+    static UVector* createMetazoneMappings(const UnicodeString &tzid);
+    static UnicodeString& formatCustomID(uint8_t hour, uint8_t min, uint8_t sec, UBool negative, UnicodeString& id);
+    static const char16_t* getShortIDFromCanonical(const char16_t* canonicalID);
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+#endif // ZONEMETA_H