Java example source code file (DateUtils.java)
The DateUtils.java Java example source code
/*
* 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.Iterator;
import java.util.Locale;
import java.util.NoSuchElementException;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
/**
* <p>A suite of utilities surrounding the use of the
* {@link java.util.Calendar} and {@link java.util.Date} object.</p>
*
* <p>DateUtils contains a lot of common methods considering manipulations
* of Dates or Calendars. Some methods require some extra explanation.
* The truncate, ceiling and round methods could be considered the Math.floor(),
* Math.ceil() or Math.round versions for dates
* This way date-fields will be ignored in bottom-up order.
* As a complement to these methods we've introduced some fragment-methods.
* With these methods the Date-fields will be ignored in top-down order.
* Since a date without a year is not a valid date, you have to decide in what
* kind of date-field you want your result, for instance milliseconds or days.
* </p>
* <p>
* Several methods are provided for adding to {@code Date} objects, of the form
* {@code addXXX(Date date, int amount)}. It is important to note these methods
* use a {@code Calendar} internally (with default timezone and locale) and may
* be affected by changes to daylight saving time (DST).
* </p>
*
* @since 2.0
*/
public class DateUtils {
/**
* Number of milliseconds in a standard second.
* @since 2.1
*/
public static final long MILLIS_PER_SECOND = 1000;
/**
* Number of milliseconds in a standard minute.
* @since 2.1
*/
public static final long MILLIS_PER_MINUTE = 60 * MILLIS_PER_SECOND;
/**
* Number of milliseconds in a standard hour.
* @since 2.1
*/
public static final long MILLIS_PER_HOUR = 60 * MILLIS_PER_MINUTE;
/**
* Number of milliseconds in a standard day.
* @since 2.1
*/
public static final long MILLIS_PER_DAY = 24 * MILLIS_PER_HOUR;
/**
* This is half a month, so this represents whether a date is in the top
* or bottom half of the month.
*/
public static final int SEMI_MONTH = 1001;
private static final int[][] fields = {
{Calendar.MILLISECOND},
{Calendar.SECOND},
{Calendar.MINUTE},
{Calendar.HOUR_OF_DAY, Calendar.HOUR},
{Calendar.DATE, Calendar.DAY_OF_MONTH, Calendar.AM_PM
/* Calendar.DAY_OF_YEAR, Calendar.DAY_OF_WEEK, Calendar.DAY_OF_WEEK_IN_MONTH */
},
{Calendar.MONTH, DateUtils.SEMI_MONTH},
{Calendar.YEAR},
{Calendar.ERA}};
/**
* A week range, starting on Sunday.
*/
public static final int RANGE_WEEK_SUNDAY = 1;
/**
* A week range, starting on Monday.
*/
public static final int RANGE_WEEK_MONDAY = 2;
/**
* A week range, starting on the day focused.
*/
public static final int RANGE_WEEK_RELATIVE = 3;
/**
* A week range, centered around the day focused.
*/
public static final int RANGE_WEEK_CENTER = 4;
/**
* A month range, the week starting on Sunday.
*/
public static final int RANGE_MONTH_SUNDAY = 5;
/**
* A month range, the week starting on Monday.
*/
public static final int RANGE_MONTH_MONDAY = 6;
/**
* Calendar modification types.
*/
private enum ModifyType {
/**
* Truncation.
*/
TRUNCATE,
/**
* Rounding.
*/
ROUND,
/**
* Ceiling.
*/
CEILING
}
/**
* <p>{@code DateUtils} instances should NOT be constructed in
* standard programming. Instead, the static methods on the class should
* be used, such as {@code DateUtils.parseDate(str);}.</p>
*
* <p>This constructor is public to permit tools that require a JavaBean
* instance to operate.</p>
*/
public DateUtils() {
super();
}
//-----------------------------------------------------------------------
/**
* <p>Checks if two date objects are on the same day ignoring time.
*
* <p>28 Mar 2002 13:45 and 28 Mar 2002 06:01 would return true.
* 28 Mar 2002 13:45 and 12 Mar 2002 13:45 would return false.
* </p>
*
* @param date1 the first date, not altered, not null
* @param date2 the second date, not altered, not null
* @return true if they represent the same day
* @throws IllegalArgumentException if either date is <code>null
* @since 2.1
*/
public static boolean isSameDay(final Date date1, final Date date2) {
if (date1 == null || date2 == null) {
throw new IllegalArgumentException("The date must not be null");
}
final Calendar cal1 = Calendar.getInstance();
cal1.setTime(date1);
final Calendar cal2 = Calendar.getInstance();
cal2.setTime(date2);
return isSameDay(cal1, cal2);
}
/**
* <p>Checks if two calendar objects are on the same day ignoring time.
*
* <p>28 Mar 2002 13:45 and 28 Mar 2002 06:01 would return true.
* 28 Mar 2002 13:45 and 12 Mar 2002 13:45 would return false.
* </p>
*
* @param cal1 the first calendar, not altered, not null
* @param cal2 the second calendar, not altered, not null
* @return true if they represent the same day
* @throws IllegalArgumentException if either calendar is <code>null
* @since 2.1
*/
public static boolean isSameDay(final Calendar cal1, final Calendar cal2) {
if (cal1 == null || cal2 == null) {
throw new IllegalArgumentException("The date must not be null");
}
return cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA) &&
cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) &&
cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR);
}
//-----------------------------------------------------------------------
/**
* <p>Checks if two date objects represent the same instant in time.
*
* <p>This method compares the long millisecond time of the two objects.
*
* @param date1 the first date, not altered, not null
* @param date2 the second date, not altered, not null
* @return true if they represent the same millisecond instant
* @throws IllegalArgumentException if either date is <code>null
* @since 2.1
*/
public static boolean isSameInstant(final Date date1, final Date date2) {
if (date1 == null || date2 == null) {
throw new IllegalArgumentException("The date must not be null");
}
return date1.getTime() == date2.getTime();
}
/**
* <p>Checks if two calendar objects represent the same instant in time.
*
* <p>This method compares the long millisecond time of the two objects.
*
* @param cal1 the first calendar, not altered, not null
* @param cal2 the second calendar, not altered, not null
* @return true if they represent the same millisecond instant
* @throws IllegalArgumentException if either date is <code>null
* @since 2.1
*/
public static boolean isSameInstant(final Calendar cal1, final Calendar cal2) {
if (cal1 == null || cal2 == null) {
throw new IllegalArgumentException("The date must not be null");
}
return cal1.getTime().getTime() == cal2.getTime().getTime();
}
//-----------------------------------------------------------------------
/**
* <p>Checks if two calendar objects represent the same local time.
*
* <p>This method compares the values of the fields of the two objects.
* In addition, both calendars must be the same of the same type.</p>
*
* @param cal1 the first calendar, not altered, not null
* @param cal2 the second calendar, not altered, not null
* @return true if they represent the same millisecond instant
* @throws IllegalArgumentException if either date is <code>null
* @since 2.1
*/
public static boolean isSameLocalTime(final Calendar cal1, final Calendar cal2) {
if (cal1 == null || cal2 == null) {
throw new IllegalArgumentException("The date must not be null");
}
return cal1.get(Calendar.MILLISECOND) == cal2.get(Calendar.MILLISECOND) &&
cal1.get(Calendar.SECOND) == cal2.get(Calendar.SECOND) &&
cal1.get(Calendar.MINUTE) == cal2.get(Calendar.MINUTE) &&
cal1.get(Calendar.HOUR_OF_DAY) == cal2.get(Calendar.HOUR_OF_DAY) &&
cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR) &&
cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) &&
cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA) &&
cal1.getClass() == cal2.getClass();
}
//-----------------------------------------------------------------------
/**
* <p>Parses a string representing a date by trying a variety of different parsers.
*
* <p>The parse will try each parse pattern in turn.
* A parse is only deemed successful if it parses the whole of the input string.
* If no parse patterns match, a ParseException is thrown.</p>
* The parser will be lenient toward the parsed date.
*
* @param str the date to parse, not null
* @param parsePatterns the date format patterns to use, see SimpleDateFormat, not null
* @return the parsed date
* @throws IllegalArgumentException if the date string or pattern array is null
* @throws ParseException if none of the date patterns were suitable (or there were none)
*/
public static Date parseDate(final String str, final String... parsePatterns) throws ParseException {
return parseDate(str, null, parsePatterns);
}
//-----------------------------------------------------------------------
/**
* <p>Parses a string representing a date by trying a variety of different parsers,
* using the default date format symbols for the given locale.</p>
*
* <p>The parse will try each parse pattern in turn.
* A parse is only deemed successful if it parses the whole of the input string.
* If no parse patterns match, a ParseException is thrown.</p>
* The parser will be lenient toward the parsed date.
*
* @param str the date to parse, not null
* @param locale the locale whose date format symbols should be used. If <code>null,
* the system locale is used (as per {@link #parseDate(String, String...)}).
* @param parsePatterns the date format patterns to use, see SimpleDateFormat, not null
* @return the parsed date
* @throws IllegalArgumentException if the date string or pattern array is null
* @throws ParseException if none of the date patterns were suitable (or there were none)
* @since 3.2
*/
public static Date parseDate(final String str, final Locale locale, final String... parsePatterns) throws ParseException {
return parseDateWithLeniency(str, locale, parsePatterns, true);
}
//-----------------------------------------------------------------------
/**
* <p>Parses a string representing a date by trying a variety of different parsers.
*
* <p>The parse will try each parse pattern in turn.
* A parse is only deemed successful if it parses the whole of the input string.
* If no parse patterns match, a ParseException is thrown.</p>
* The parser parses strictly - it does not allow for dates such as "February 942, 1996".
*
* @param str the date to parse, not null
* @param parsePatterns the date format patterns to use, see SimpleDateFormat, not null
* @return the parsed date
* @throws IllegalArgumentException if the date string or pattern array is null
* @throws ParseException if none of the date patterns were suitable
* @since 2.5
*/
public static Date parseDateStrictly(final String str, final String... parsePatterns) throws ParseException {
return parseDateStrictly(str, null, parsePatterns);
}
/**
* <p>Parses a string representing a date by trying a variety of different parsers,
* using the default date format symbols for the given locale..</p>
*
* <p>The parse will try each parse pattern in turn.
* A parse is only deemed successful if it parses the whole of the input string.
* If no parse patterns match, a ParseException is thrown.</p>
* The parser parses strictly - it does not allow for dates such as "February 942, 1996".
*
* @param str the date to parse, not null
* @param locale the locale whose date format symbols should be used. If <code>null,
* the system locale is used (as per {@link #parseDateStrictly(String, String...)}).
* @param parsePatterns the date format patterns to use, see SimpleDateFormat, not null
* @return the parsed date
* @throws IllegalArgumentException if the date string or pattern array is null
* @throws ParseException if none of the date patterns were suitable
* @since 3.2
*/
public static Date parseDateStrictly(final String str, final Locale locale, final String... parsePatterns) throws ParseException {
return parseDateWithLeniency(str, locale, parsePatterns, false);
}
/**
* <p>Parses a string representing a date by trying a variety of different parsers.
*
* <p>The parse will try each parse pattern in turn.
* A parse is only deemed successful if it parses the whole of the input string.
* If no parse patterns match, a ParseException is thrown.</p>
*
* @param str the date to parse, not null
* @param locale the locale to use when interpretting the pattern, can be null in which
* case the default system locale is used
* @param parsePatterns the date format patterns to use, see SimpleDateFormat, not null
* @param lenient Specify whether or not date/time parsing is to be lenient.
* @return the parsed date
* @throws IllegalArgumentException if the date string or pattern array is null
* @throws ParseException if none of the date patterns were suitable
* @see java.util.Calendar#isLenient()
*/
private static Date parseDateWithLeniency(
final String str, final Locale locale, final String[] parsePatterns, final boolean lenient) throws ParseException {
if (str == null || parsePatterns == null) {
throw new IllegalArgumentException("Date and Patterns must not be null");
}
final TimeZone tz = TimeZone.getDefault();
final Locale lcl = locale==null ?Locale.getDefault() : locale;
final ParsePosition pos = new ParsePosition(0);
final Calendar calendar = Calendar.getInstance(tz, lcl);
calendar.setLenient(lenient);
for (final String parsePattern : parsePatterns) {
FastDateParser fdp = new FastDateParser(parsePattern, tz, lcl);
calendar.clear();
try {
if (fdp.parse(str, pos, calendar) && pos.getIndex()==str.length()) {
return calendar.getTime();
}
}
catch(IllegalArgumentException ignore) {
// leniency is preventing calendar from being set
}
pos.setIndex(0);
}
throw new ParseException("Unable to parse the date: " + str, -1);
}
//-----------------------------------------------------------------------
/**
* Adds a number of years to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addYears(final Date date, final int amount) {
return add(date, Calendar.YEAR, amount);
}
//-----------------------------------------------------------------------
/**
* Adds a number of months to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addMonths(final Date date, final int amount) {
return add(date, Calendar.MONTH, amount);
}
//-----------------------------------------------------------------------
/**
* Adds a number of weeks to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addWeeks(final Date date, final int amount) {
return add(date, Calendar.WEEK_OF_YEAR, amount);
}
//-----------------------------------------------------------------------
/**
* Adds a number of days to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addDays(final Date date, final int amount) {
return add(date, Calendar.DAY_OF_MONTH, amount);
}
//-----------------------------------------------------------------------
/**
* Adds a number of hours to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addHours(final Date date, final int amount) {
return add(date, Calendar.HOUR_OF_DAY, amount);
}
//-----------------------------------------------------------------------
/**
* Adds a number of minutes to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addMinutes(final Date date, final int amount) {
return add(date, Calendar.MINUTE, amount);
}
//-----------------------------------------------------------------------
/**
* Adds a number of seconds to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addSeconds(final Date date, final int amount) {
return add(date, Calendar.SECOND, amount);
}
//-----------------------------------------------------------------------
/**
* Adds a number of milliseconds to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addMilliseconds(final Date date, final int amount) {
return add(date, Calendar.MILLISECOND, amount);
}
//-----------------------------------------------------------------------
/**
* Adds to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param calendarField the calendar field to add to
* @param amount the amount to add, may be negative
* @return the new {@code Date} with the amount added
* @throws IllegalArgumentException if the date is null
*/
private static Date add(final Date date, final int calendarField, final int amount) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
final Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(calendarField, amount);
return c.getTime();
}
//-----------------------------------------------------------------------
/**
* Sets the years field to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to set
* @return a new {@code Date} set with the specified value
* @throws IllegalArgumentException if the date is null
* @since 2.4
*/
public static Date setYears(final Date date, final int amount) {
return set(date, Calendar.YEAR, amount);
}
//-----------------------------------------------------------------------
/**
* Sets the months field to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to set
* @return a new {@code Date} set with the specified value
* @throws IllegalArgumentException if the date is null
* @since 2.4
*/
public static Date setMonths(final Date date, final int amount) {
return set(date, Calendar.MONTH, amount);
}
//-----------------------------------------------------------------------
/**
* Sets the day of month field to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to set
* @return a new {@code Date} set with the specified value
* @throws IllegalArgumentException if the date is null
* @since 2.4
*/
public static Date setDays(final Date date, final int amount) {
return set(date, Calendar.DAY_OF_MONTH, amount);
}
//-----------------------------------------------------------------------
/**
* Sets the hours field to a date returning a new object. Hours range
* from 0-23.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to set
* @return a new {@code Date} set with the specified value
* @throws IllegalArgumentException if the date is null
* @since 2.4
*/
public static Date setHours(final Date date, final int amount) {
return set(date, Calendar.HOUR_OF_DAY, amount);
}
//-----------------------------------------------------------------------
/**
* Sets the minute field to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to set
* @return a new {@code Date} set with the specified value
* @throws IllegalArgumentException if the date is null
* @since 2.4
*/
public static Date setMinutes(final Date date, final int amount) {
return set(date, Calendar.MINUTE, amount);
}
//-----------------------------------------------------------------------
/**
* Sets the seconds field to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to set
* @return a new {@code Date} set with the specified value
* @throws IllegalArgumentException if the date is null
* @since 2.4
*/
public static Date setSeconds(final Date date, final int amount) {
return set(date, Calendar.SECOND, amount);
}
//-----------------------------------------------------------------------
/**
* Sets the milliseconds field to a date returning a new object.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param amount the amount to set
* @return a new {@code Date} set with the specified value
* @throws IllegalArgumentException if the date is null
* @since 2.4
*/
public static Date setMilliseconds(final Date date, final int amount) {
return set(date, Calendar.MILLISECOND, amount);
}
//-----------------------------------------------------------------------
/**
* Sets the specified field to a date returning a new object.
* This does not use a lenient calendar.
* The original {@code Date} is unchanged.
*
* @param date the date, not null
* @param calendarField the {@code Calendar} field to set the amount to
* @param amount the amount to set
* @return a new {@code Date} set with the specified value
* @throws IllegalArgumentException if the date is null
* @since 2.4
*/
private static Date set(final Date date, final int calendarField, final int amount) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
// getInstance() returns a new object, so this method is thread safe.
final Calendar c = Calendar.getInstance();
c.setLenient(false);
c.setTime(date);
c.set(calendarField, amount);
return c.getTime();
}
//-----------------------------------------------------------------------
/**
* Converts a {@code Date} into a {@code Calendar}.
*
* @param date the date to convert to a Calendar
* @return the created Calendar
* @throws NullPointerException if null is passed in
* @since 3.0
*/
public static Calendar toCalendar(final Date date) {
final Calendar c = Calendar.getInstance();
c.setTime(date);
return c;
}
//-----------------------------------------------------------------------
/**
* <p>Rounds a date, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if this was passed with HOUR, it would return
* 28 Mar 2002 14:00:00.000. If this was passed with MONTH, it
* would return 1 April 2002 0:00:00.000.</p>
*
* <p>For a date in a timezone that handles the change to daylight
* saving time, rounding to Calendar.HOUR_OF_DAY will behave as follows.
* Suppose daylight saving time begins at 02:00 on March 30. Rounding a
* date that crosses this time would produce the following values:
* </p>
* <ul>
* <li>March 30, 2003 01:10 rounds to March 30, 2003 01:00
* <li>March 30, 2003 01:40 rounds to March 30, 2003 03:00
* <li>March 30, 2003 02:10 rounds to March 30, 2003 03:00
* <li>March 30, 2003 02:40 rounds to March 30, 2003 04:00
* </ul>
*
* @param date the date to work with, not null
* @param field the field from {@code Calendar} or {@code SEMI_MONTH}
* @return the different rounded date, not null
* @throws ArithmeticException if the year is over 280 million
*/
public static Date round(final Date date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
final Calendar gval = Calendar.getInstance();
gval.setTime(date);
modify(gval, field, ModifyType.ROUND);
return gval.getTime();
}
/**
* <p>Rounds a date, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if this was passed with HOUR, it would return
* 28 Mar 2002 14:00:00.000. If this was passed with MONTH, it
* would return 1 April 2002 0:00:00.000.</p>
*
* <p>For a date in a timezone that handles the change to daylight
* saving time, rounding to Calendar.HOUR_OF_DAY will behave as follows.
* Suppose daylight saving time begins at 02:00 on March 30. Rounding a
* date that crosses this time would produce the following values:
* </p>
* <ul>
* <li>March 30, 2003 01:10 rounds to March 30, 2003 01:00
* <li>March 30, 2003 01:40 rounds to March 30, 2003 03:00
* <li>March 30, 2003 02:10 rounds to March 30, 2003 03:00
* <li>March 30, 2003 02:40 rounds to March 30, 2003 04:00
* </ul>
*
* @param date the date to work with, not null
* @param field the field from {@code Calendar} or <code>SEMI_MONTH
* @return the different rounded date, not null
* @throws IllegalArgumentException if the date is <code>null
* @throws ArithmeticException if the year is over 280 million
*/
public static Calendar round(final Calendar date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
final Calendar rounded = (Calendar) date.clone();
modify(rounded, field, ModifyType.ROUND);
return rounded;
}
/**
* <p>Rounds a date, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if this was passed with HOUR, it would return
* 28 Mar 2002 14:00:00.000. If this was passed with MONTH, it
* would return 1 April 2002 0:00:00.000.</p>
*
* <p>For a date in a timezone that handles the change to daylight
* saving time, rounding to Calendar.HOUR_OF_DAY will behave as follows.
* Suppose daylight saving time begins at 02:00 on March 30. Rounding a
* date that crosses this time would produce the following values:
* </p>
* <ul>
* <li>March 30, 2003 01:10 rounds to March 30, 2003 01:00
* <li>March 30, 2003 01:40 rounds to March 30, 2003 03:00
* <li>March 30, 2003 02:10 rounds to March 30, 2003 03:00
* <li>March 30, 2003 02:40 rounds to March 30, 2003 04:00
* </ul>
*
* @param date the date to work with, either {@code Date} or {@code Calendar}, not null
* @param field the field from {@code Calendar} or <code>SEMI_MONTH
* @return the different rounded date, not null
* @throws IllegalArgumentException if the date is <code>null
* @throws ClassCastException if the object type is not a {@code Date} or {@code Calendar}
* @throws ArithmeticException if the year is over 280 million
*/
public static Date round(final Object date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
if (date instanceof Date) {
return round((Date) date, field);
} else if (date instanceof Calendar) {
return round((Calendar) date, field).getTime();
} else {
throw new ClassCastException("Could not round " + date);
}
}
//-----------------------------------------------------------------------
/**
* <p>Truncates a date, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if you passed with HOUR, it would return 28 Mar
* 2002 13:00:00.000. If this was passed with MONTH, it would
* return 1 Mar 2002 0:00:00.000.</p>
*
* @param date the date to work with, not null
* @param field the field from {@code Calendar} or <code>SEMI_MONTH
* @return the different truncated date, not null
* @throws IllegalArgumentException if the date is <code>null
* @throws ArithmeticException if the year is over 280 million
*/
public static Date truncate(final Date date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
final Calendar gval = Calendar.getInstance();
gval.setTime(date);
modify(gval, field, ModifyType.TRUNCATE);
return gval.getTime();
}
/**
* <p>Truncates a date, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if you passed with HOUR, it would return 28 Mar
* 2002 13:00:00.000. If this was passed with MONTH, it would
* return 1 Mar 2002 0:00:00.000.</p>
*
* @param date the date to work with, not null
* @param field the field from {@code Calendar} or <code>SEMI_MONTH
* @return the different truncated date, not null
* @throws IllegalArgumentException if the date is <code>null
* @throws ArithmeticException if the year is over 280 million
*/
public static Calendar truncate(final Calendar date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
final Calendar truncated = (Calendar) date.clone();
modify(truncated, field, ModifyType.TRUNCATE);
return truncated;
}
/**
* <p>Truncates a date, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if you passed with HOUR, it would return 28 Mar
* 2002 13:00:00.000. If this was passed with MONTH, it would
* return 1 Mar 2002 0:00:00.000.</p>
*
* @param date the date to work with, either {@code Date} or {@code Calendar}, not null
* @param field the field from {@code Calendar} or <code>SEMI_MONTH
* @return the different truncated date, not null
* @throws IllegalArgumentException if the date is <code>null
* @throws ClassCastException if the object type is not a {@code Date} or {@code Calendar}
* @throws ArithmeticException if the year is over 280 million
*/
public static Date truncate(final Object date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
if (date instanceof Date) {
return truncate((Date) date, field);
} else if (date instanceof Calendar) {
return truncate((Calendar) date, field).getTime();
} else {
throw new ClassCastException("Could not truncate " + date);
}
}
//-----------------------------------------------------------------------
/**
* <p>Gets a date ceiling, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if you passed with HOUR, it would return 28 Mar
* 2002 14:00:00.000. If this was passed with MONTH, it would
* return 1 Apr 2002 0:00:00.000.</p>
*
* @param date the date to work with, not null
* @param field the field from {@code Calendar} or <code>SEMI_MONTH
* @return the different ceil date, not null
* @throws IllegalArgumentException if the date is <code>null
* @throws ArithmeticException if the year is over 280 million
* @since 2.5
*/
public static Date ceiling(final Date date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
final Calendar gval = Calendar.getInstance();
gval.setTime(date);
modify(gval, field, ModifyType.CEILING);
return gval.getTime();
}
/**
* <p>Gets a date ceiling, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if you passed with HOUR, it would return 28 Mar
* 2002 14:00:00.000. If this was passed with MONTH, it would
* return 1 Apr 2002 0:00:00.000.</p>
*
* @param date the date to work with, not null
* @param field the field from {@code Calendar} or <code>SEMI_MONTH
* @return the different ceil date, not null
* @throws IllegalArgumentException if the date is <code>null
* @throws ArithmeticException if the year is over 280 million
* @since 2.5
*/
public static Calendar ceiling(final Calendar date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
final Calendar ceiled = (Calendar) date.clone();
modify(ceiled, field, ModifyType.CEILING);
return ceiled;
}
/**
* <p>Gets a date ceiling, leaving the field specified as the most
* significant field.</p>
*
* <p>For example, if you had the date-time of 28 Mar 2002
* 13:45:01.231, if you passed with HOUR, it would return 28 Mar
* 2002 14:00:00.000. If this was passed with MONTH, it would
* return 1 Apr 2002 0:00:00.000.</p>
*
* @param date the date to work with, either {@code Date} or {@code Calendar}, not null
* @param field the field from {@code Calendar} or <code>SEMI_MONTH
* @return the different ceil date, not null
* @throws IllegalArgumentException if the date is <code>null
* @throws ClassCastException if the object type is not a {@code Date} or {@code Calendar}
* @throws ArithmeticException if the year is over 280 million
* @since 2.5
*/
public static Date ceiling(final Object date, final int field) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
if (date instanceof Date) {
return ceiling((Date) date, field);
} else if (date instanceof Calendar) {
return ceiling((Calendar) date, field).getTime();
} else {
throw new ClassCastException("Could not find ceiling of for type: " + date.getClass());
}
}
//-----------------------------------------------------------------------
/**
* <p>Internal calculation method.
*
* @param val the calendar, not null
* @param field the field constant
* @param modType type to truncate, round or ceiling
* @throws ArithmeticException if the year is over 280 million
*/
private static void modify(final Calendar val, final int field, final ModifyType modType) {
if (val.get(Calendar.YEAR) > 280000000) {
throw new ArithmeticException("Calendar value too large for accurate calculations");
}
if (field == Calendar.MILLISECOND) {
return;
}
// ----------------- Fix for LANG-59 ---------------------- START ---------------
// see http://issues.apache.org/jira/browse/LANG-59
//
// Manually truncate milliseconds, seconds and minutes, rather than using
// Calendar methods.
final Date date = val.getTime();
long time = date.getTime();
boolean done = false;
// truncate milliseconds
final int millisecs = val.get(Calendar.MILLISECOND);
if (ModifyType.TRUNCATE == modType || millisecs < 500) {
time = time - millisecs;
}
if (field == Calendar.SECOND) {
done = true;
}
// truncate seconds
final int seconds = val.get(Calendar.SECOND);
if (!done && (ModifyType.TRUNCATE == modType || seconds < 30)) {
time = time - (seconds * 1000L);
}
if (field == Calendar.MINUTE) {
done = true;
}
// truncate minutes
final int minutes = val.get(Calendar.MINUTE);
if (!done && (ModifyType.TRUNCATE == modType || minutes < 30)) {
time = time - (minutes * 60000L);
}
// reset time
if (date.getTime() != time) {
date.setTime(time);
val.setTime(date);
}
// ----------------- Fix for LANG-59 ----------------------- END ----------------
boolean roundUp = false;
for (final int[] aField : fields) {
for (final int element : aField) {
if (element == field) {
//This is our field... we stop looping
if (modType == ModifyType.CEILING || modType == ModifyType.ROUND && roundUp) {
if (field == DateUtils.SEMI_MONTH) {
//This is a special case that's hard to generalize
//If the date is 1, we round up to 16, otherwise
// we subtract 15 days and add 1 month
if (val.get(Calendar.DATE) == 1) {
val.add(Calendar.DATE, 15);
} else {
val.add(Calendar.DATE, -15);
val.add(Calendar.MONTH, 1);
}
// ----------------- Fix for LANG-440 ---------------------- START ---------------
} else if (field == Calendar.AM_PM) {
// This is a special case
// If the time is 0, we round up to 12, otherwise
// we subtract 12 hours and add 1 day
if (val.get(Calendar.HOUR_OF_DAY) == 0) {
val.add(Calendar.HOUR_OF_DAY, 12);
} else {
val.add(Calendar.HOUR_OF_DAY, -12);
val.add(Calendar.DATE, 1);
}
// ----------------- Fix for LANG-440 ---------------------- END ---------------
} else {
//We need at add one to this field since the
// last number causes us to round up
val.add(aField[0], 1);
}
}
return;
}
}
//We have various fields that are not easy roundings
int offset = 0;
boolean offsetSet = false;
//These are special types of fields that require different rounding rules
switch (field) {
case DateUtils.SEMI_MONTH:
if (aField[0] == Calendar.DATE) {
//If we're going to drop the DATE field's value,
// we want to do this our own way.
//We need to subtrace 1 since the date has a minimum of 1
offset = val.get(Calendar.DATE) - 1;
//If we're above 15 days adjustment, that means we're in the
// bottom half of the month and should stay accordingly.
if (offset >= 15) {
offset -= 15;
}
//Record whether we're in the top or bottom half of that range
roundUp = offset > 7;
offsetSet = true;
}
break;
case Calendar.AM_PM:
if (aField[0] == Calendar.HOUR_OF_DAY) {
//If we're going to drop the HOUR field's value,
// we want to do this our own way.
offset = val.get(Calendar.HOUR_OF_DAY);
if (offset >= 12) {
offset -= 12;
}
roundUp = offset >= 6;
offsetSet = true;
}
break;
default:
break;
}
if (!offsetSet) {
final int min = val.getActualMinimum(aField[0]);
final int max = val.getActualMaximum(aField[0]);
//Calculate the offset from the minimum allowed value
offset = val.get(aField[0]) - min;
//Set roundUp if this is more than half way between the minimum and maximum
roundUp = offset > ((max - min) / 2);
}
//We need to remove this field
if (offset != 0) {
val.set(aField[0], val.get(aField[0]) - offset);
}
}
throw new IllegalArgumentException("The field " + field + " is not supported");
}
//-----------------------------------------------------------------------
/**
* <p>Constructs an
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