static void TestDateIntervalFormat()
{
    const DateIntervalFormatTestItem * testItemPtr;
    UErrorCode status = U_ZERO_ERROR;
    ctest_setTimeZone(NULL, &status);
    log_verbose("\nTesting udtitvfmt_open() and udtitvfmt_format() with various parameters\n");
    for ( testItemPtr = testItems; testItemPtr->locale != NULL; ++testItemPtr ) {
        UDateIntervalFormat* udtitvfmt;
        int32_t tzidLen;
        UChar skelBuf[kSkelBufLen];
        UChar tzidBuf[kTZIDBufLen];
        const char * tzidForLog = (testItemPtr->tzid)? testItemPtr->tzid: "NULL";

        status = U_ZERO_ERROR;
        u_unescape(testItemPtr->skeleton, skelBuf, kSkelBufLen);
        if ( testItemPtr->tzid ) {
            u_unescape(testItemPtr->tzid, tzidBuf, kTZIDBufLen);
            tzidLen = -1;
        } else {
            tzidLen = 0;
        }
        udtitvfmt = udtitvfmt_open(testItemPtr->locale, skelBuf, -1, tzidBuf, tzidLen, &status);
        if ( U_SUCCESS(status) ) {
            UChar result[kFormatBufLen];
            UChar resultExpected[kFormatBufLen];
            int32_t fmtLen = udtitvfmt_format(udtitvfmt, testItemPtr->from, testItemPtr->to, result, kFormatBufLen, NULL, &status);
            if (fmtLen >= kFormatBufLen) {
                result[kFormatBufLen-1] = 0;
            }
            if ( U_SUCCESS(status) ) {
                u_unescape(testItemPtr->resultExpected, resultExpected, kFormatBufLen);
                if ( u_strcmp(result, resultExpected) != 0 ) {
                    char bcharBuf[kFormatBufLen];
                    log_err("ERROR: udtitvfmt_format for locale %s, skeleton %s, tzid %s, from %.1f, to %.1f: expect %s, get %s\n",
                             testItemPtr->locale, testItemPtr->skeleton, tzidForLog, testItemPtr->from, testItemPtr->to,
                             testItemPtr->resultExpected, u_austrcpy(bcharBuf,result) );
                }
            } else {
                log_err("FAIL: udtitvfmt_format for locale %s, skeleton %s, tzid %s, from %.1f, to %.1f: %s\n",
                        testItemPtr->locale, testItemPtr->skeleton, tzidForLog, testItemPtr->from, testItemPtr->to, myErrorName(status) );
            }
            udtitvfmt_close(udtitvfmt);
        } else {
            log_data_err("FAIL: udtitvfmt_open for locale %s, skeleton %s, tzid %s - %s\n",
                    testItemPtr->locale, testItemPtr->skeleton, tzidForLog, myErrorName(status) );
        }
    }
    ctest_resetTimeZone();
}
static void TestFPos_SkelWithSeconds()
{
	const LocaleAndSkeletonItem * locSkelItemPtr;
	for (locSkelItemPtr = locSkelItems; locSkelItemPtr->locale != NULL; locSkelItemPtr++) {
	    UDateIntervalFormat* udifmt;
	    UChar   ubuf[kSizeUBuf];
	    int32_t ulen, uelen;
	    UErrorCode status = U_ZERO_ERROR;
	    
	    u_strFromUTF8(ubuf, kSizeUBuf, &ulen, locSkelItemPtr->skeleton, -1, &status);
	    udifmt = udtitvfmt_open(locSkelItemPtr->locale, ubuf, ulen, zoneGMT, -1, &status);
	    if ( U_FAILURE(status) ) {
           log_data_err("FAIL: udtitvfmt_open for locale %s, skeleton %s: %s\n",
                    locSkelItemPtr->locale, locSkelItemPtr->skeleton, u_errorName(status));
	    } else {
			const double * deltasPtr = deltas;
			const ExpectPosAndFormat * expectedPtr = locSkelItemPtr->expected;
			for (; *deltasPtr >= 0.0; deltasPtr++, expectedPtr++) {
			    UFieldPosition fpos = { locSkelItemPtr->fieldToCheck, 0, 0 };
			    UChar uebuf[kSizeUBuf];
			    char bbuf[kSizeBBuf];
			    char bebuf[kSizeBBuf];
			    status = U_ZERO_ERROR;
			    uelen = u_unescape(expectedPtr->format, uebuf, kSizeUBuf);
			    ulen = udtitvfmt_format(udifmt, startTime, startTime + *deltasPtr, ubuf, kSizeUBuf, &fpos, &status);
			    if ( U_FAILURE(status) ) {
			        log_err("FAIL: udtitvfmt_format for locale %s, skeleton %s, delta %.1f: %s\n",
			             locSkelItemPtr->locale, locSkelItemPtr->skeleton, *deltasPtr, u_errorName(status));
			    } else if ( ulen != uelen || u_strncmp(ubuf,uebuf,uelen) != 0 ||
			                fpos.beginIndex != expectedPtr->posBegin || fpos.endIndex != expectedPtr->posEnd ) {
			        u_strToUTF8(bbuf, kSizeBBuf, NULL, ubuf, ulen, &status);
			        u_strToUTF8(bebuf, kSizeBBuf, NULL, uebuf, uelen, &status); // convert back to get unescaped string
			        log_err("FAIL: udtitvfmt_format for locale %s, skeleton %s, delta %12.1f, expect %d-%d \"%s\", get %d-%d \"%s\"\n",
			             locSkelItemPtr->locale, locSkelItemPtr->skeleton, *deltasPtr,
			             expectedPtr->posBegin, expectedPtr->posEnd, bebuf,
			             fpos.beginIndex, fpos.endIndex, bbuf);
			    }
			}
	        udtitvfmt_close(udifmt);
	    }
    }
}