core/src/main/java/org/apache/james/mime4j/util/MimeUtil.java [361:389]:
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        .withLocale(Locale.US);

    private static Map<Long, String> monthOfYear() {
        HashMap<Long, String> result = new HashMap<>();
        result.put(1L, "Jan");
        result.put(2L, "Feb");
        result.put(3L, "Mar");
        result.put(4L, "Apr");
        result.put(5L, "May");
        result.put(6L, "Jun");
        result.put(7L, "Jul");
        result.put(8L, "Aug");
        result.put(9L, "Sep");
        result.put(10L, "Oct");
        result.put(11L, "Nov");
        result.put(12L, "Dec");
        return result;
    }

    private static Map<Long, String> dayOfWeek() {
        HashMap<Long, String> result = new HashMap<>();
        result.put(1L, "Mon");
        result.put(2L, "Tue");
        result.put(3L, "Wed");
        result.put(4L, "Thu");
        result.put(5L, "Fri");
        result.put(6L, "Sat");
        result.put(7L, "Sun");
        return result;
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dom/src/main/java/org/apache/james/mime4j/field/DateTimeFieldLenientImpl.java [90:118]:
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        .withLocale(Locale.US);

    private static Map<Long, String> monthOfYear() {
        HashMap<Long, String> result = new HashMap<>();
        result.put(1L, "Jan");
        result.put(2L, "Feb");
        result.put(3L, "Mar");
        result.put(4L, "Apr");
        result.put(5L, "May");
        result.put(6L, "Jun");
        result.put(7L, "Jul");
        result.put(8L, "Aug");
        result.put(9L, "Sep");
        result.put(10L, "Oct");
        result.put(11L, "Nov");
        result.put(12L, "Dec");
        return result;
    }

    private static Map<Long, String> dayOfWeek() {
        HashMap<Long, String> result = new HashMap<>();
        result.put(1L, "Mon");
        result.put(2L, "Tue");
        result.put(3L, "Wed");
        result.put(4L, "Thu");
        result.put(5L, "Fri");
        result.put(6L, "Sat");
        result.put(7L, "Sun");
        return result;
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