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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.
/*
* 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.
*
* Note that the JDK has a bug wherein calling Calendar.get(int) will
* override any previously called Calendar.clear() calls. See LANG-755.
*
* Note that when using capital YYYY instead of lowercase yyyy, the formatter
* will assume current year as week year is not supported. See {@link java.util.GregorianCalendar}
* Week Year section for an explanation on the difference between calendar and week years.
*
* @since 2.0
*/
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 = FastTimeZone.getGmtTimeZone();
/**
* ISO 8601 formatter for date-time without time zone.
*
*
* The format used is {@code yyyy-MM-dd'T'HH:mm:ss}. This format uses the
* default TimeZone in effect at the time of loading DateFormatUtils class.
*
*
* @since 3.5
*/
public static final FastDateFormat ISO_8601_EXTENDED_DATETIME_FORMAT
= FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss");
/**
* @deprecated - as of 4.0, ISO_DATETIME_FORMAT will be replaced by ISO_8601_EXTENDED_DATETIME_FORMAT.
*/
@Deprecated
public static final FastDateFormat ISO_DATETIME_FORMAT = ISO_8601_EXTENDED_DATETIME_FORMAT;
/**
* ISO 8601 formatter for date-time with time zone.
*
*
* The format used is {@code yyyy-MM-dd'T'HH:mm:ssZZ}. This format uses the
* default TimeZone in effect at the time of loading DateFormatUtils class.
*
*
* @since 3.5
*/
public static final FastDateFormat ISO_8601_EXTENDED_DATETIME_TIME_ZONE_FORMAT
= FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ssZZ");
/**
* @deprecated - as of 4.0, ISO_DATETIME_TIME_ZONE_FORMAT will be replaced by ISO_8601_EXTENDED_DATETIME_TIME_ZONE_FORMAT.
*/
@Deprecated
public static final FastDateFormat ISO_DATETIME_TIME_ZONE_FORMAT = ISO_8601_EXTENDED_DATETIME_TIME_ZONE_FORMAT;
/**
* ISO 8601 formatter for date without time zone.
*
*
* The format used is {@code yyyy-MM-dd}. This format uses the
* default TimeZone in effect at the time of loading DateFormatUtils class.
*
*
* @since 3.5
*/
public static final FastDateFormat ISO_8601_EXTENDED_DATE_FORMAT
= FastDateFormat.getInstance("yyyy-MM-dd");
/**
* @deprecated - as of 4.0, ISO_DATE_FORMAT will be replaced by ISO_8601_EXTENDED_DATE_FORMAT.
*/
@Deprecated
public static final FastDateFormat ISO_DATE_FORMAT = ISO_8601_EXTENDED_DATE_FORMAT;
/**
* 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. This format uses the default TimeZone in
* effect at the time of loading DateFormatUtils class.
*
*
* @deprecated - as of 4.0, ISO_DATE_TIME_ZONE_FORMAT will be removed.
*/
@Deprecated
public static final FastDateFormat ISO_DATE_TIME_ZONE_FORMAT
= FastDateFormat.getInstance("yyyy-MM-ddZZ");
/**
* Non-compliant formatter for time without time zone (ISO 8601 does not
* prefix 'T' for standalone time value).
*
*
* The format used is {@code 'T'HH:mm:ss}. This format uses the default
* TimeZone in effect at the time of loading DateFormatUtils class.
*
*
* @deprecated - as of 4.0, ISO_TIME_FORMAT will be removed.
*/
@Deprecated
public static final FastDateFormat ISO_TIME_FORMAT
= FastDateFormat.getInstance("'T'HH:mm:ss");
/**
* Non-compliant formatter for time with time zone (ISO 8601 does not
* prefix 'T' for standalone time value).
*
*
* The format used is {@code 'T'HH:mm:ssZZ}. This format uses the default
* TimeZone in effect at the time of loading DateFormatUtils class.
*
*
* @deprecated - as of 4.0, ISO_TIME_TIME_ZONE_FORMAT will be removed.
*/
@Deprecated
public static final FastDateFormat ISO_TIME_TIME_ZONE_FORMAT
= FastDateFormat.getInstance("'T'HH:mm:ssZZ");
/**
* ISO 8601 formatter for time without time zone.
*
*
* The format used is {@code HH:mm:ss}. This format uses the default
* TimeZone in effect at the time of loading DateFormatUtils class.
*
*
* @since 3.5
*/
public static final FastDateFormat ISO_8601_EXTENDED_TIME_FORMAT
= FastDateFormat.getInstance("HH:mm:ss");
/**
* @deprecated - as of 4.0, ISO_TIME_NO_T_FORMAT will be replaced by ISO_8601_EXTENDED_TIME_FORMAT.
*/
@Deprecated
public static final FastDateFormat ISO_TIME_NO_T_FORMAT = ISO_8601_EXTENDED_TIME_FORMAT;
/**
* ISO 8601 formatter for time with time zone.
*
*
* The format used is {@code HH:mm:ssZZ}. This format uses the default
* TimeZone in effect at the time of loading DateFormatUtils class.
*
*
* @since 3.5
*/
public static final FastDateFormat ISO_8601_EXTENDED_TIME_TIME_ZONE_FORMAT
= FastDateFormat.getInstance("HH:mm:ssZZ");
/**
* @deprecated - as of 4.0, ISO_TIME_NO_T_TIME_ZONE_FORMAT will be replaced by ISO_8601_EXTENDED_TIME_TIME_ZONE_FORMAT.
*/
@Deprecated
public static final FastDateFormat ISO_TIME_NO_T_TIME_ZONE_FORMAT = ISO_8601_EXTENDED_TIME_TIME_ZONE_FORMAT;
/**
* SMTP (and probably other) date headers.
*
*
* The format used is {@code EEE, dd MMM yyyy HH:mm:ss Z} in US locale.
* This format uses the default TimeZone in effect at the time of loading
* DateFormatUtils class.
*
*/
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() {
}
/**
* Formats a calendar into a specific pattern. The TimeZone from the calendar
* will be used for formatting.
*
* @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(final Calendar calendar, final String pattern) {
return format(calendar, pattern, getTimeZone(calendar), null);
}
/**
* Formats a calendar into a specific pattern in a locale. The TimeZone from the calendar
* will be used for formatting.
*
* @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 {@code null}
* @return the formatted calendar
* @see FastDateFormat#format(Calendar)
* @since 2.4
*/
public static String format(final Calendar calendar, final String pattern, final Locale locale) {
return format(calendar, pattern, getTimeZone(calendar), locale);
}
/**
* 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 {@code null}
* @return the formatted calendar
* @see FastDateFormat#format(Calendar)
* @since 2.4
*/
public static String format(final Calendar calendar, final String pattern, final TimeZone timeZone) {
return format(calendar, pattern, timeZone, null);
}
/**
* 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 {@code null}
* @param locale the locale to use, may be {@code null}
* @return the formatted calendar
* @see FastDateFormat#format(Calendar)
* @since 2.4
*/
public static String format(final Calendar calendar, final String pattern, final TimeZone timeZone, final Locale locale) {
final FastDateFormat df = FastDateFormat.getInstance(pattern, timeZone, locale);
return df.format(calendar);
}
/**
* 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(final Date date, final String pattern) {
return format(date, pattern, null, null);
}
/**
* 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 {@code null}
* @return the formatted date
*/
public static String format(final Date date, final String pattern, final Locale locale) {
return format(date, pattern, null, locale);
}
/**
* 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 {@code null}
* @return the formatted date
*/
public static String format(final Date date, final String pattern, final TimeZone timeZone) {
return format(date, pattern, timeZone, null);
}
/**
* 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 {@code null}
* @param locale the locale to use, may be {@code null}
* @return the formatted date
*/
public static String format(final Date date, final String pattern, final TimeZone timeZone, final Locale locale) {
final FastDateFormat df = FastDateFormat.getInstance(pattern, timeZone, locale);
return df.format(date);
}
/**
* 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(final long millis, final String pattern) {
return format(new Date(millis), pattern, null, 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 {@code null}
* @return the formatted date
*/
public static String format(final long millis, final String pattern, final Locale locale) {
return format(new Date(millis), pattern, null, locale);
}
/**
* 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 {@code null}
* @return the formatted date
*/
public static String format(final long millis, final String pattern, final TimeZone timeZone) {
return format(new Date(millis), pattern, timeZone, null);
}
/**
* 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 {@code null}
* @param locale the locale to use, may be {@code null}
* @return the formatted date
*/
public static String format(final long millis, final String pattern, final TimeZone timeZone, final Locale locale) {
return format(new Date(millis), pattern, timeZone, 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
* @return the formatted date
*/
public static String formatUTC(final Date date, final String pattern) {
return format(date, 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
* @param locale the locale to use, may be {@code null}
* @return the formatted date
*/
public static String formatUTC(final Date date, final String pattern, final Locale locale) {
return format(date, pattern, UTC_TIME_ZONE, locale);
}
/**
* 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(final long millis, final 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 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 {@code null}
* @return the formatted date
*/
public static String formatUTC(final long millis, final String pattern, final Locale locale) {
return format(new Date(millis), pattern, UTC_TIME_ZONE, locale);
}
private static TimeZone getTimeZone(final Calendar calendar) {
return calendar == null ? null : calendar.getTimeZone();
}
}