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diff --git a/intl/icu/source/i18n/iso8601cal.h b/intl/icu/source/i18n/iso8601cal.h
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+// © 2022 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+#ifndef ISO8601CAL_H
+#define ISO8601CAL_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/calendar.h"
+#include "unicode/gregocal.h"
+#include "unicode/timezone.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * Concrete class which provides the ISO8601 calendar.
+ * <P>
+ * <code>ISO8601Calendar</code> is a subclass of <code>GregorianCalendar</code>
+ * that the first day of a week is Monday and the minimal days in the first
+ * week of a year or month is four days.
+ * <p>
+ * The ISO8601 calendar is identical to the Gregorian calendar in all respects
+ * except for the first day of week and the minimal days in the first week
+ * of a year. 
+ * @internal
+ */
+class ISO8601Calendar : public GregorianCalendar {
+ public:
+  //-------------------------------------------------------------------------
+  // Constructors...
+  //-------------------------------------------------------------------------
+
+  /**
+   * Constructs a DangiCalendar based on the current time in the default time zone
+   * with the given locale.
+   *
+   * @param aLocale  The given locale.
+   * @param success  Indicates the status of ISO8601Calendar object construction.
+   *                 Returns U_ZERO_ERROR if constructed successfully.
+   * @internal
+   */
+  ISO8601Calendar(const Locale& aLocale, UErrorCode &success);
+
+  /**
+   * Copy Constructor
+   * @internal
+   */
+  ISO8601Calendar(const ISO8601Calendar& other) = default;
+
+  /**
+   * Destructor.
+   * @internal
+   */
+  virtual ~ISO8601Calendar();
+
+  /**
+   * Clone.
+   * @internal
+   */
+  virtual ISO8601Calendar* clone() const override;
+
+  // UObject stuff
+ public: 
+  /**
+   * @return   The class ID for this object. All objects of a given class have the
+   *           same class ID. Objects of other classes have different class IDs.
+   * @internal
+   */
+  virtual UClassID getDynamicClassID() const override;
+
+  /**
+   * Return the class ID for this class. This is useful only for comparing to a return
+   * value from getDynamicClassID(). For example:
+   *
+   *      Base* polymorphic_pointer = createPolymorphicObject();
+   *      if (polymorphic_pointer->getDynamicClassID() ==
+   *          Derived::getStaticClassID()) ...
+   *
+   * @return   The class ID for all objects of this class.
+   * @internal
+   */
+  U_I18N_API static UClassID U_EXPORT2 getStaticClassID();
+
+  /**
+   * return the calendar type, "iso8601".
+   *
+   * @return calendar type
+   * @internal
+   */
+  virtual const char * getType() const override;
+
+
+ private:
+ 
+  ISO8601Calendar(); // default constructor not implemented
+};
+
+U_NAMESPACE_END
+
+#endif
+#endif