<commit_before>/*
 * 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.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

/**
 * <p>Date and time formatting utilities and constants.</p>
 *
 * <p>Formatting is performed using the thread-safe
 * {@link org.apache.commons.lang3.time.FastDateFormat} class.</p>
 *
 * <p>Note that the JDK has a bug wherein calling Calendar.get(int) will 
 * override any previously called Calendar.clear() calls. See LANG-755.</p>
 *
 * @since 2.0
 * @version $Id$
 */
public class DateFormatUtils {

    /**
     * The UTC time zone (often referred to as GMT).
     * This is private as it is mutable.
     */
    private static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("GMT");
    /**
     * ISO 8601 formatter for date-time without time zone.
     * The format used is <tt>yyyy-MM-dd'T'HH:mm:ss</tt>.
     */
    public static final FastDateFormat ISO_DATETIME_FORMAT
            = FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss");

    /**
     * ISO 8601 formatter for date-time with time zone.
     * The format used is <tt>yyyy-MM-dd'T'HH:mm:ssZZ</tt>.
     */
    public static final FastDateFormat ISO_DATETIME_TIME_ZONE_FORMAT
            = FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ssZZ");

    /**
     * ISO 8601 formatter for date without time zone.
     * The format used is <tt>yyyy-MM-dd</tt>.
     */
    public static final FastDateFormat ISO_DATE_FORMAT
            = FastDateFormat.getInstance("yyyy-MM-dd");

    /**
     * ISO 8601-like formatter for date with time zone.
     * The format used is <tt>yyyy-MM-ddZZ</tt>.
     * This pattern does not comply with the formal ISO 8601 specification
     * as the standard does not allow a time zone  without a time.
     */
    public static final FastDateFormat ISO_DATE_TIME_ZONE_FORMAT
            = FastDateFormat.getInstance("yyyy-MM-ddZZ");

    /**
     * ISO 8601 formatter for time without time zone.
     * The format used is <tt>'T'HH:mm:ss</tt>.
     */
    public static final FastDateFormat ISO_TIME_FORMAT
            = FastDateFormat.getInstance("'T'HH:mm:ss");

    /**
     * ISO 8601 formatter for time with time zone.
     * The format used is <tt>'T'HH:mm:ssZZ</tt>.
     */
    public static final FastDateFormat ISO_TIME_TIME_ZONE_FORMAT
            = FastDateFormat.getInstance("'T'HH:mm:ssZZ");

    /**
     * ISO 8601-like formatter for time without time zone.
     * The format used is <tt>HH:mm:ss</tt>.
     * This pattern does not comply with the formal ISO 8601 specification
     * as the standard requires the 'T' prefix for times.
     */
    public static final FastDateFormat ISO_TIME_NO_T_FORMAT
            = FastDateFormat.getInstance("HH:mm:ss");

    /**
     * ISO 8601-like formatter for time with time zone.
     * The format used is <tt>HH:mm:ssZZ</tt>.
     * This pattern does not comply with the formal ISO 8601 specification
     * as the standard requires the 'T' prefix for times.
     */
    public static final FastDateFormat ISO_TIME_NO_T_TIME_ZONE_FORMAT
            = FastDateFormat.getInstance("HH:mm:ssZZ");

    /**
     * SMTP (and probably other) date headers.
     * The format used is <tt>EEE, dd MMM yyyy HH:mm:ss Z</tt> in US locale.
     */
    public static final FastDateFormat SMTP_DATETIME_FORMAT
            = FastDateFormat.getInstance("EEE, dd MMM yyyy HH:mm:ss Z", Locale.US);

    //-----------------------------------------------------------------------
    /**
     * <p>DateFormatUtils instances should NOT be constructed in standard programming.</p>
     *
     * <p>This constructor is public to permit tools that require a JavaBean instance
     * to operate.</p>
     */
    public DateFormatUtils() {
        super();
    }

    /**
     * <p>Formats a date/time into a specific pattern using the UTC time zone.</p>
     * 
     * @param millis  the date to format expressed in milliseconds
     * @param pattern  the pattern to use to format the date, not null
     * @return the formatted date
     */
    public static String formatUTC(final long millis, final String pattern) {
        return format(new Date(millis), pattern, UTC_TIME_ZONE, null);<commit_msg>Use the more modern, compact, and flexible Javadoc "{@code ...}" instead of the HTML "<tt>...</tt>".<commit_after>/*
 * 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.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

/**
 * <p>Date and time formatting utilities and constants.</p>
 *
 * <p>Formatting is performed using the thread-safe
 * {@link org.apache.commons.lang3.time.FastDateFormat} class.</p>
 *
 * <p>Note that the JDK has a bug wherein calling Calendar.get(int) will 
 * override any previously called Calendar.clear() calls. See LANG-755.</p>
 *
 * @since 2.0
 * @version $Id$
 */
public class DateFormatUtils {

    /**
     * The UTC time zone (often referred to as GMT).
     * This is private as it is mutable.
     */
    private static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("GMT");
    /**
     * ISO 8601 formatter for date-time without time zone.
     * The format used is {@code yyyy-MM-dd'T'HH:mm:ss}.
     */
    public static final FastDateFormat ISO_DATETIME_FORMAT
            = FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss");

    /**
     * ISO 8601 formatter for date-time with time zone.
     * The format used is {@code yyyy-MM-dd'T'HH:mm:ssZZ}.
     */
    public static final FastDateFormat ISO_DATETIME_TIME_ZONE_FORMAT
            = FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ssZZ");

    /**
     * ISO 8601 formatter for date without time zone.
     * The format used is {@code yyyy-MM-dd}.
     */
    public static final FastDateFormat ISO_DATE_FORMAT
            = FastDateFormat.getInstance("yyyy-MM-dd");

    /**
     * ISO 8601-like formatter for date with time zone.
     * The format used is {@code yyyy-MM-ddZZ}.
     * This pattern does not comply with the formal ISO 8601 specification
     * as the standard does not allow a time zone  without a time.
     */
    public static final FastDateFormat ISO_DATE_TIME_ZONE_FORMAT
            = FastDateFormat.getInstance("yyyy-MM-ddZZ");

    /**
     * ISO 8601 formatter for time without time zone.
     * The format used is {@code 'T'HH:mm:ss}.
     */
    public static final FastDateFormat ISO_TIME_FORMAT
            = FastDateFormat.getInstance("'T'HH:mm:ss");

    /**
     * ISO 8601 formatter for time with time zone.
     * The format used is {@code 'T'HH:mm:ssZZ}.
     */
    public static final FastDateFormat ISO_TIME_TIME_ZONE_FORMAT
            = FastDateFormat.getInstance("'T'HH:mm:ssZZ");

    /**
     * ISO 8601-like formatter for time without time zone.
     * The format used is {@code HH:mm:ss}.
     * This pattern does not comply with the formal ISO 8601 specification
     * as the standard requires the 'T' prefix for times.
     */
    public static final FastDateFormat ISO_TIME_NO_T_FORMAT
            = FastDateFormat.getInstance("HH:mm:ss");

    /**
     * ISO 8601-like formatter for time with time zone.
     * The format used is {@code HH:mm:ssZZ}.
     * This pattern does not comply with the formal ISO 8601 specification
     * as the standard requires the 'T' prefix for times.
     */
    public static final FastDateFormat ISO_TIME_NO_T_TIME_ZONE_FORMAT
            = FastDateFormat.getInstance("HH:mm:ssZZ");

    /**
     * SMTP (and probably other) date headers.
     * The format used is {@code EEE, dd MMM yyyy HH:mm:ss Z} in US locale.
     */
    public static final FastDateFormat SMTP_DATETIME_FORMAT
            = FastDateFormat.getInstance("EEE, dd MMM yyyy HH:mm:ss Z", Locale.US);

    //-----------------------------------------------------------------------
    /**
     * <p>DateFormatUtils instances should NOT be constructed in standard programming.</p>
     *
     * <p>This constructor is public to permit tools that require a JavaBean instance
     * to operate.</p>
     */
    public DateFormatUtils() {
        super();
    }

    /**
     * <p>Formats a date/time into a specific pattern using the UTC time zone.</p>
     * 
     * @param millis  the date to format expressed in milliseconds
     * @param pattern  the pattern to use to format the date, not null
     * @return the formatted date
     */
    public static String formatUTC(final long millis, final String pattern) {
        return format(new Date(millis), pattern, UTC_TIME_ZONE, null);
{'fraction_non_alphanumeric': 0.10867842282544085, 'fraction_numerical': 0.01089756290865861, 'mean_word_length': 2.7292205393424456, 'pattern_counts': {'":': 0, '<': 47, '<?xml version=': 0, '>': 47, 'https://': 0, 'lorem ipsum': 0, 'www.': 2, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '1564387', 'n_tokens_mistral': 2988, 'n_tokens_neox': 2838, 'n_words': 1043}