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Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.apache.commons.lang3.time;

import java.text.ParseException;
import java.text.ParsePosition;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

/**
 * DateParser is the "missing" interface for the parsing methods of
 * {@link java.text.DateFormat}. You can obtain an object implementing this
 * interface by using one of the FastDateFormat factory methods.
 * 
 * Warning: Since binary compatible methods may be added to this interface in any
 * release, developers are not expected to implement this interface.
 *
 * @since 3.2
 */
public interface DateParser {

    /**
     * Gets the locale used by this parser.
     *
     * @return the locale
     */
    Locale getLocale();

    // Accessors
    /**
     * Gets the pattern used by this parser.
     *
     * @return the pattern, {@link java.text.SimpleDateFormat} compatible
     */
    String getPattern();

    /**
     * Gets the time zone used by this parser.
     *
     * 

     * The default {@link TimeZone} used to create a {@link Date} when the {@link TimeZone} is not specified by
     * the format pattern.
     * 
     *
     * @return the time zone
     */
    TimeZone getTimeZone();

    /**
     * Equivalent to DateFormat.parse(String).
     *
     * See {@link java.text.DateFormat#parse(String)} for more information.
     * @param source A {@link String} whose beginning should be parsed.
     * @return A {@link Date} parsed from the string
     * @throws ParseException if the beginning of the specified string cannot be parsed.
     */
    Date parse(String source) throws ParseException;

    /**
     * Equivalent to DateFormat.parse(String, ParsePosition).
     *
     * See {@link java.text.DateFormat#parse(String, ParsePosition)} for more information.
     *
     * @param source A {@link String}, part of which should be parsed.
     * @param pos A {@link ParsePosition} object with index and error index information
     * as described above.
     * @return A {@link Date} parsed from the string. In case of error, returns null.
     * @throws NullPointerException if text or pos is null.
     */
    Date parse(String source, ParsePosition pos);

    /**
     * Parses a formatted date string according to the format.  Updates the Calendar with parsed fields.
     * Upon success, the ParsePosition index is updated to indicate how much of the source text was consumed.
     * Not all source text needs to be consumed.  Upon parse failure, ParsePosition error index is updated to
     * the offset of the source text which does not match the supplied format.
     *
     * @param source The text to parse.
     * @param pos On input, the position in the source to start parsing, on output, updated position.
     * @param calendar The calendar into which to set parsed fields.
     * @return true, if source has been parsed (pos parsePosition is updated); otherwise false (and pos errorIndex is updated)
     * @throws IllegalArgumentException when Calendar has been set to be not lenient, and a parsed field is
     * out of range.
     *
     * @since 3.5
     */
    boolean parse(String source, ParsePosition pos, Calendar calendar);

    /**
     * Parses text from a string to produce a Date.
     *
     * @param source A {@link String} whose beginning should be parsed.
     * @return a {@link java.util.Date} object
     * @throws ParseException if the beginning of the specified string cannot be parsed.
     * @see java.text.DateFormat#parseObject(String)
     */
    Object parseObject(String source) throws ParseException;

    /**
     * Parses a date/time string according to the given parse position.
     *
     * @param source A {@link String} whose beginning should be parsed.
     * @param pos the parse position
     * @return a {@link java.util.Date} object
     * @see java.text.DateFormat#parseObject(String, ParsePosition)
     */
    Object parseObject(String source, ParsePosition pos);
}