src/java.base/share/classes/java/time/format/DateTimeFormatterBuilder.java

@@ -3460,11 +3460,11 @@
                     .append(DateTimeFormatter.ISO_LOCAL_DATE).appendLiteral('T')
                     .appendValue(HOUR_OF_DAY, 2).appendLiteral(':')
                     .appendValue(MINUTE_OF_HOUR, 2).appendLiteral(':')
                     .appendValue(SECOND_OF_MINUTE, 2)
                     .appendFraction(NANO_OF_SECOND, minDigits, maxDigits, true)
-                    .appendLiteral('Z')
+                    .appendOffsetId()
                     .toFormatter().toPrinterParser(false);
             DateTimeParseContext newContext = context.copy();
             int pos = parser.parse(newContext, text, position);
             if (pos < 0) {
                 return pos;

@@ -3478,10 +3478,11 @@
             int min = newContext.getParsed(MINUTE_OF_HOUR).intValue();
             Long secVal = newContext.getParsed(SECOND_OF_MINUTE);
             Long nanoVal = newContext.getParsed(NANO_OF_SECOND);
             int sec = (secVal != null ? secVal.intValue() : 0);
             int nano = (nanoVal != null ? nanoVal.intValue() : 0);
+            int offset = newContext.getParsed(OFFSET_SECONDS).intValue();
             int days = 0;
             if (hour == 24 && min == 0 && sec == 0 && nano == 0) {
                 hour = 0;
                 days = 1;
             } else if (hour == 23 && min == 59 && sec == 60) {

@@ -3490,11 +3491,11 @@
             }
             int year = (int) yearParsed % 10_000;
             long instantSecs;
             try {
                 LocalDateTime ldt = LocalDateTime.of(year, month, day, hour, min, sec, 0).plusDays(days);
-                instantSecs = ldt.toEpochSecond(ZoneOffset.UTC);
+                instantSecs = ldt.toEpochSecond(ZoneOffset.ofTotalSeconds(offset));
                 instantSecs += Math.multiplyExact(yearParsed / 10_000L, SECONDS_PER_10000_YEARS);
             } catch (RuntimeException ex) {
                 return ~position;
             }
             int successPos = pos;