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diff --git a/intl/icu/source/i18n/taiwncal.cpp b/intl/icu/source/i18n/taiwncal.cpp
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+++ b/intl/icu/source/i18n/taiwncal.cpp
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+ *******************************************************************************
+ * Copyright (C) 2003-2013, International Business Machines Corporation and
+ * others. All Rights Reserved.
+ *******************************************************************************
+ *
+ * File TAIWNCAL.CPP
+ *
+ * Modification History:
+ *  05/13/2003    srl     copied from gregocal.cpp
+ *  06/29/2007    srl     copied from buddhcal.cpp
+ *  05/12/2008    jce     modified to use calendar=roc per CLDR
+ *
+ */
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "taiwncal.h"
+#include "unicode/gregocal.h"
+#include "umutex.h"
+#include <float.h>
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TaiwanCalendar)
+
+static const int32_t kTaiwanEraStart = 1911;  // 1911 (Gregorian)
+
+static const int32_t kGregorianEpoch = 1970; 
+
+TaiwanCalendar::TaiwanCalendar(const Locale& aLocale, UErrorCode& success)
+:   GregorianCalendar(aLocale, success)
+{
+    setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
+}
+
+TaiwanCalendar::~TaiwanCalendar()
+{
+}
+
+TaiwanCalendar::TaiwanCalendar(const TaiwanCalendar& source)
+: GregorianCalendar(source)
+{
+}
+
+TaiwanCalendar& TaiwanCalendar::operator= ( const TaiwanCalendar& right)
+{
+    GregorianCalendar::operator=(right);
+    return *this;
+}
+
+TaiwanCalendar* TaiwanCalendar::clone() const
+{
+    return new TaiwanCalendar(*this);
+}
+
+const char *TaiwanCalendar::getType() const
+{
+    return "roc";
+}
+
+int32_t TaiwanCalendar::handleGetExtendedYear()
+{
+    // EXTENDED_YEAR in TaiwanCalendar is a Gregorian year
+    // The default value of EXTENDED_YEAR is 1970 (Minguo 59)
+    int32_t year = kGregorianEpoch;
+
+    if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR
+        && newerField(UCAL_EXTENDED_YEAR, UCAL_ERA) == UCAL_EXTENDED_YEAR) {
+        year = internalGet(UCAL_EXTENDED_YEAR, kGregorianEpoch);
+    } else {
+        int32_t era = internalGet(UCAL_ERA, MINGUO);
+        if(era == MINGUO) {
+            year =     internalGet(UCAL_YEAR, 1) + kTaiwanEraStart;
+        } else if(era == BEFORE_MINGUO) {
+            year = 1 - internalGet(UCAL_YEAR, 1) + kTaiwanEraStart;
+        }
+    }
+    return year;
+}
+
+void TaiwanCalendar::handleComputeFields(int32_t julianDay, UErrorCode& status)
+{
+    GregorianCalendar::handleComputeFields(julianDay, status);
+    int32_t y = internalGet(UCAL_EXTENDED_YEAR) - kTaiwanEraStart;
+    if(y>0) {
+        internalSet(UCAL_ERA, MINGUO);
+        internalSet(UCAL_YEAR, y);
+    } else {
+        internalSet(UCAL_ERA, BEFORE_MINGUO);
+        internalSet(UCAL_YEAR, 1-y);
+    }
+}
+
+int32_t TaiwanCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const
+{
+    if(field == UCAL_ERA) {
+        if(limitType == UCAL_LIMIT_MINIMUM || limitType == UCAL_LIMIT_GREATEST_MINIMUM) {
+            return BEFORE_MINGUO;
+        } else {
+            return MINGUO;
+        }
+    } else {
+        return GregorianCalendar::handleGetLimit(field,limitType);
+    }
+}
+
+#if 0
+void TaiwanCalendar::timeToFields(UDate theTime, UBool quick, UErrorCode& status)
+{
+    //Calendar::timeToFields(theTime, quick, status);
+
+    int32_t era = internalGet(UCAL_ERA);
+    int32_t year = internalGet(UCAL_YEAR);
+
+    if(era == GregorianCalendar::BC) {
+        year = 1-year;
+        era = TaiwanCalendar::MINGUO;
+    } else if(era == GregorianCalendar::AD) {
+        era = TaiwanCalendar::MINGUO;
+    } else {
+        status = U_INTERNAL_PROGRAM_ERROR;
+    }
+
+    year = year - kTaiwanEraStart;
+
+    internalSet(UCAL_ERA, era);
+    internalSet(UCAL_YEAR, year);
+}
+#endif
+
+/**
+ * The system maintains a static default century start date and Year.  They are
+ * initialized the first time they are used.  Once the system default century date 
+ * and year are set, they do not change.
+ */
+static UDate           gSystemDefaultCenturyStart       = DBL_MIN;
+static int32_t         gSystemDefaultCenturyStartYear   = -1;
+static icu::UInitOnce  gSystemDefaultCenturyInit        {};
+
+UBool TaiwanCalendar::haveDefaultCentury() const
+{
+    return true;
+}
+
+static void U_CALLCONV initializeSystemDefaultCentury()
+{
+    // initialize systemDefaultCentury and systemDefaultCenturyYear based
+    // on the current time.  They'll be set to 80 years before
+    // the current time.
+    UErrorCode status = U_ZERO_ERROR;
+    TaiwanCalendar calendar(Locale("@calendar=roc"),status);
+    if (U_SUCCESS(status))
+    {
+        calendar.setTime(Calendar::getNow(), status);
+        calendar.add(UCAL_YEAR, -80, status);
+
+        gSystemDefaultCenturyStart = calendar.getTime(status);
+        gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
+    }
+    // We have no recourse upon failure unless we want to propagate the failure
+    // out.
+}
+
+UDate TaiwanCalendar::defaultCenturyStart() const {
+    // lazy-evaluate systemDefaultCenturyStart
+    umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
+    return gSystemDefaultCenturyStart;
+}
+
+int32_t TaiwanCalendar::defaultCenturyStartYear() const {
+    // lazy-evaluate systemDefaultCenturyStartYear
+    umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
+    return gSystemDefaultCenturyStartYear;
+}
+
+U_NAMESPACE_END
+
+#endif