Add m-esr52 at 52.6.0

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diff --git a/intl/icu/source/i18n/unicode/udateintervalformat.h b/intl/icu/source/i18n/unicode/udateintervalformat.h
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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*****************************************************************************************
+* Copyright (C) 2010-2012,2015 International Business Machines
+* Corporation and others. All Rights Reserved.
+*****************************************************************************************
+*/
+
+#ifndef UDATEINTERVALFORMAT_H
+#define UDATEINTERVALFORMAT_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/umisc.h"
+#include "unicode/localpointer.h"
+
+/**
+ * \file
+ * \brief C API: Format a date interval.
+ *
+ * A UDateIntervalFormat is used to format the range between two UDate values
+ * in a locale-sensitive way, using a skeleton that specifies the precision and
+ * completeness of the information to show. If the range smaller than the resolution
+ * specified by the skeleton, a single date format will be produced. If the range
+ * is larger than the format specified by the skeleton, a locale-specific fallback
+ * will be used to format the items missing from the skeleton.
+ *
+ * For example, if the range is 2010-03-04 07:56 - 2010-03-04 19:56 (12 hours)
+ * - The skeleton jm will produce
+ *   for en_US, "7:56 AM - 7:56 PM"
+ *   for en_GB, "7:56 - 19:56"
+ * - The skeleton MMMd will produce
+ *   for en_US, "Mar 4"
+ *   for en_GB, "4 Mar"
+ * If the range is 2010-03-04 07:56 - 2010-03-08 16:11 (4 days, 8 hours, 15 minutes)
+ * - The skeleton jm will produce
+ *   for en_US, "3/4/2010 7:56 AM - 3/8/2010 4:11 PM"
+ *   for en_GB, "4/3/2010 7:56 - 8/3/2010 16:11"
+ * - The skeleton MMMd will produce
+ *   for en_US, "Mar 4-8"
+ *   for en_GB, "4-8 Mar"
+ * 
+ * Note:  the "-" characters in the above sample output will actually be
+ * Unicode 2013, EN_DASH, in all but the last example.
+ *
+ * Note, in ICU 4.4 the standard skeletons for which date interval format data
+ * is usually available are as follows; best results will be obtained by using
+ * skeletons from this set, or those formed by combining these standard skeletons
+ * (note that for these skeletons, the length of digit field such as d, y, or
+ * M vs MM is irrelevant (but for non-digit fields such as MMM vs MMMM it is
+ * relevant). Note that a skeleton involving h or H generally explicitly requests
+ * that time style (12- or 24-hour time respectively). For a skeleton that
+ * requests the locale's default time style (h or H), use 'j' instead of h or H.
+ *   h, H, hm, Hm,
+ *   hv, Hv, hmv, Hmv,
+ *   d,
+ *   M, MMM, MMMM,
+ *   Md, MMMd,
+ *   MEd, MMMEd,
+ *   y,
+ *   yM, yMMM, yMMMM,
+ *   yMd, yMMMd,
+ *   yMEd, yMMMEd
+ *
+ * Locales for which ICU 4.4 seems to have a reasonable amount of this data
+ * include:
+ *   af, am, ar, be, bg, bn, ca, cs, da, de (_AT), el, en (_AU,_CA,_GB,_IE,_IN...),
+ *   eo, es (_AR,_CL,_CO,...,_US) et, fa, fi, fo, fr (_BE,_CH,_CA), fur, gsw, he,
+ *   hr, hu, hy, is, it (_CH), ja, kk, km, ko, lt, lv, mk, ml, mt, nb, nl )_BE),
+ *   nn, pl, pt (_PT), rm, ro, ru (_UA), sk, sl, so, sq, sr, sr_Latn, sv, th, to,
+ *   tr, uk, ur, vi, zh (_SG), zh_Hant (_HK,_MO)
+ */
+
+/**
+ * Opaque UDateIntervalFormat object for use in C programs.
+ * @stable ICU 4.8
+ */
+struct UDateIntervalFormat;
+typedef struct UDateIntervalFormat UDateIntervalFormat;  /**< C typedef for struct UDateIntervalFormat. @stable ICU 4.8 */
+
+/**
+ * Open a new UDateIntervalFormat object using the predefined rules for a
+ * given locale plus a specified skeleton.
+ * @param locale
+ *            The locale for whose rules should be used; may be NULL for
+ *            default locale.
+ * @param skeleton
+ *            A pattern containing only the fields desired for the interval
+ *            format, for example "Hm", "yMMMd", or "yMMMEdHm".
+ * @param skeletonLength
+ *            The length of skeleton; may be -1 if the skeleton is zero-terminated.
+ * @param tzID
+ *            A timezone ID specifying the timezone to use. If 0, use the default
+ *            timezone.
+ * @param tzIDLength
+ *            The length of tzID, or -1 if null-terminated. If 0, use the default
+ *            timezone.
+ * @param status
+ *            A pointer to a UErrorCode to receive any errors.
+ * @return
+ *            A pointer to a UDateIntervalFormat object for the specified locale,
+ *            or NULL if an error occurred.
+ * @stable ICU 4.8
+ */
+U_STABLE UDateIntervalFormat* U_EXPORT2
+udtitvfmt_open(const char*  locale,
+              const UChar* skeleton,
+              int32_t      skeletonLength,
+              const UChar* tzID,
+              int32_t      tzIDLength,
+              UErrorCode*  status);
+
+/**
+ * Close a UDateIntervalFormat object. Once closed it may no longer be used.
+ * @param formatter
+ *            The UDateIntervalFormat object to close.
+ * @stable ICU 4.8
+ */
+U_STABLE void U_EXPORT2
+udtitvfmt_close(UDateIntervalFormat *formatter);
+
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * \class LocalUDateIntervalFormatPointer
+ * "Smart pointer" class, closes a UDateIntervalFormat via udtitvfmt_close().
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @stable ICU 4.8
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalUDateIntervalFormatPointer, UDateIntervalFormat, udtitvfmt_close);
+
+U_NAMESPACE_END
+
+#endif
+
+
+/**
+ * Formats a date/time range using the conventions established for the
+ * UDateIntervalFormat object.
+ * @param formatter
+ *            The UDateIntervalFormat object specifying the format conventions.
+ * @param fromDate
+ *            The starting point of the range.
+ * @param toDate
+ *            The ending point of the range.
+ * @param result
+ *            A pointer to a buffer to receive the formatted range.
+ * @param resultCapacity
+ *            The maximum size of result.
+ * @param position
+ *            A pointer to a UFieldPosition. On input, position->field is read.
+ *            On output, position->beginIndex and position->endIndex indicate
+ *            the beginning and ending indices of field number position->field,
+ *            if such a field exists. This parameter may be NULL, in which case
+ *            no field position data is returned.
+ *            There may be multiple instances of a given field type in an
+ *            interval format; in this case the position indices refer to the
+ *            first instance.
+ * @param status
+ *            A pointer to a UErrorCode to receive any errors.
+ * @return
+ *            The total buffer size needed; if greater than resultLength, the
+ *            output was truncated.
+ * @stable ICU 4.8
+ */
+U_STABLE int32_t U_EXPORT2
+udtitvfmt_format(const UDateIntervalFormat* formatter,
+                UDate           fromDate,
+                UDate           toDate,
+                UChar*          result,
+                int32_t         resultCapacity,
+                UFieldPosition* position,
+                UErrorCode*     status);
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+#endif