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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.
The code is tested using the latest revision of the JDK for supported
LTS releases: 8, 11, 17 and 21 currently.
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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.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
/**
* Date and time formatting utilities and constants.
*
* Formatting is performed using the thread-safe
* {@link org.apache.commons.lang3.time.FastDateFormat} class.
*
* @since 2.0
* @version $Id: DateFormatUtils.java 1088899 2011-04-05 05:31:27Z bayard $
*/
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");
/**
* ISO8601 formatter for date-time without time zone.
* The format used is yyyy-MM-dd'T'HH:mm:ss.
*/
public static final FastDateFormat ISO_DATETIME_FORMAT
= FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss");
/**
* ISO8601 formatter for date-time with time zone.
* The format used is 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");
/**
* ISO8601 formatter for date without time zone.
* The format used is yyyy-MM-dd.
*/
public static final FastDateFormat ISO_DATE_FORMAT
= FastDateFormat.getInstance("yyyy-MM-dd");
/**
* ISO8601-like formatter for date with time zone.
* The format used is yyyy-MM-ddZZ.
* This pattern does not comply with the formal ISO8601 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");
/**
* ISO8601 formatter for time without time zone.
* The format used is 'T'HH:mm:ss.
*/
public static final FastDateFormat ISO_TIME_FORMAT
= FastDateFormat.getInstance("'T'HH:mm:ss");
/**
* ISO8601 formatter for time with time zone.
* The format used is 'T'HH:mm:ssZZ.
*/
public static final FastDateFormat ISO_TIME_TIME_ZONE_FORMAT
= FastDateFormat.getInstance("'T'HH:mm:ssZZ");
/**
* ISO8601-like formatter for time without time zone.
* The format used is HH:mm:ss.
* This pattern does not comply with the formal ISO8601 specification
* as the standard requires the 'T' prefix for times.
*/
public static final FastDateFormat ISO_TIME_NO_T_FORMAT
= FastDateFormat.getInstance("HH:mm:ss");
/**
* ISO8601-like formatter for time with time zone.
* The format used is HH:mm:ssZZ.
* This pattern does not comply with the formal ISO8601 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 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);
//-----------------------------------------------------------------------
/**
* DateFormatUtils instances should NOT be constructed in standard programming.
*
* This constructor is public to permit tools that require a JavaBean instance
* to operate.
*/
public DateFormatUtils() {
super();
}
/**
* Formats a date/time into a specific pattern using the UTC time zone.
*
* @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(long millis, String pattern) {
return format(new Date(millis), pattern, UTC_TIME_ZONE, null);
}
/**
* Formats a date/time into a specific pattern using the UTC time zone.
*
* @param date the date to format, not null
* @param pattern the pattern to use to format the date, not null
* @return the formatted date
*/
public static String formatUTC(Date date, String pattern) {
return format(date, pattern, UTC_TIME_ZONE, null);
}
/**
* Formats a date/time into a specific pattern using the UTC time zone.
*
* @param millis the date to format expressed in milliseconds
* @param pattern the pattern to use to format the date, not null
* @param locale the locale to use, may be null
* @return the formatted date
*/
public static String formatUTC(long millis, String pattern, Locale locale) {
return format(new Date(millis), pattern, UTC_TIME_ZONE, locale);
}
/**
* Formats a date/time into a specific pattern using the UTC time zone.
*
* @param date the date to format, not null
* @param pattern the pattern to use to format the date, not null
* @param locale the locale to use, may be null
* @return the formatted date
*/
public static String formatUTC(Date date, String pattern, Locale locale) {
return format(date, pattern, UTC_TIME_ZONE, locale);
}
/**
* Formats a date/time into a specific pattern.
*
* @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 format(long millis, String pattern) {
return format(new Date(millis), pattern, null, null);
}
/**
* Formats a date/time into a specific pattern.
*
* @param date the date to format, not null
* @param pattern the pattern to use to format the date, not null
* @return the formatted date
*/
public static String format(Date date, String pattern) {
return format(date, pattern, null, null);
}
/**
* Formats a calendar into a specific pattern.
*
* @param calendar the calendar to format, not null
* @param pattern the pattern to use to format the calendar, not null
* @return the formatted calendar
* @see FastDateFormat#format(Calendar)
* @since 2.4
*/
public static String format(Calendar calendar, String pattern) {
return format(calendar, pattern, null, null);
}
/**
* Formats a date/time into a specific pattern in a time zone.
*
* @param millis the time expressed in milliseconds
* @param pattern the pattern to use to format the date, not null
* @param timeZone the time zone to use, may be null
* @return the formatted date
*/
public static String format(long millis, String pattern, TimeZone timeZone) {
return format(new Date(millis), pattern, timeZone, null);
}
/**
* Formats a date/time into a specific pattern in a time zone.
*
* @param date the date to format, not null
* @param pattern the pattern to use to format the date, not null
* @param timeZone the time zone to use, may be null
* @return the formatted date
*/
public static String format(Date date, String pattern, TimeZone timeZone) {
return format(date, pattern, timeZone, null);
}
/**
* Formats a calendar into a specific pattern in a time zone.
*
* @param calendar the calendar to format, not null
* @param pattern the pattern to use to format the calendar, not null
* @param timeZone the time zone to use, may be null
* @return the formatted calendar
* @see FastDateFormat#format(Calendar)
* @since 2.4
*/
public static String format(Calendar calendar, String pattern, TimeZone timeZone) {
return format(calendar, pattern, timeZone, null);
}
/**
* Formats a date/time into a specific pattern in a locale.
*
* @param millis the date to format expressed in milliseconds
* @param pattern the pattern to use to format the date, not null
* @param locale the locale to use, may be null
* @return the formatted date
*/
public static String format(long millis, String pattern, Locale locale) {
return format(new Date(millis), pattern, null, locale);
}
/**
* Formats a date/time into a specific pattern in a locale.
*
* @param date the date to format, not null
* @param pattern the pattern to use to format the date, not null
* @param locale the locale to use, may be null
* @return the formatted date
*/
public static String format(Date date, String pattern, Locale locale) {
return format(date, pattern, null, locale);
}
/**
* Formats a calendar into a specific pattern in a locale.
*
* @param calendar the calendar to format, not null
* @param pattern the pattern to use to format the calendar, not null
* @param locale the locale to use, may be null
* @return the formatted calendar
* @see FastDateFormat#format(Calendar)
* @since 2.4
*/
public static String format(Calendar calendar, String pattern, Locale locale) {
return format(calendar, pattern, null, locale);
}
/**
* Formats a date/time into a specific pattern in a time zone and locale.
*
* @param millis the date to format expressed in milliseconds
* @param pattern the pattern to use to format the date, not null
* @param timeZone the time zone to use, may be null
* @param locale the locale to use, may be null
* @return the formatted date
*/
public static String format(long millis, String pattern, TimeZone timeZone, Locale locale) {
return format(new Date(millis), pattern, timeZone, locale);
}
/**
* Formats a date/time into a specific pattern in a time zone and locale.
*
* @param date the date to format, not null
* @param pattern the pattern to use to format the date, not null, not null
* @param timeZone the time zone to use, may be null
* @param locale the locale to use, may be null
* @return the formatted date
*/
public static String format(Date date, String pattern, TimeZone timeZone, Locale locale) {
FastDateFormat df = FastDateFormat.getInstance(pattern, timeZone, locale);
return df.format(date);
}
/**
* Formats a calendar into a specific pattern in a time zone and locale.
*
* @param calendar the calendar to format, not null
* @param pattern the pattern to use to format the calendar, not null
* @param timeZone the time zone to use, may be null
* @param locale the locale to use, may be null
* @return the formatted calendar
* @see FastDateFormat#format(Calendar)
* @since 2.4
*/
public static String format(Calendar calendar, String pattern, TimeZone timeZone, Locale locale) {
FastDateFormat df = FastDateFormat.getInstance(pattern, timeZone, locale);
return df.format(calendar);
}
}
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