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  *  Copyright 2001-2007 Stephen Colebourne
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
package org.joda.time.field;
Converts a strict DateTimeField into a lenient one. By being lenient, the set method accepts out of bounds values, performing an addition instead.

LenientDateTimeField is thread-safe and immutable.

Brian S O'Neill
See also:
    private static final long serialVersionUID = 8714085824173290599L;
    private final Chronology iBase;

Returns a lenient version of the given field. If it is already lenient, then it is returned as-is. Otherwise, a new LenientDateTimeField is returned.
    public static DateTimeField getInstance(DateTimeField fieldChronology base) {
        if (field == null) {
            return null;
        if (field instanceof StrictDateTimeField) {
            field = ((StrictDateTimeField)field).getWrappedField();
        if (field.isLenient()) {
            return field;
        return new LenientDateTimeField(fieldbase);
    protected LenientDateTimeField(DateTimeField fieldChronology base) {
         = base;
    public final boolean isLenient() {
        return true;

Set values which may be out of bounds by adding the difference between the new value and the current value.
    public long set(long instantint value) {
        // lenient needs to handle time zone chronologies
        // so we do the calculation using local milliseconds
        long localInstant = .getZone().convertUTCToLocal(instant);
        long difference = FieldUtils.safeSubtract(valueget(instant));
        localInstant = getType().getField(.withUTC()).add(localInstantdifference);
        return .getZone().convertLocalToUTC(localInstantfalseinstant);
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