date.php

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<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [e-mail] so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Date
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @version    $Id: Date.php 4192 2007-03-22 22:19:37Z thomas $
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */


/**
 * Include needed Date classes
 */
require_once 'Zend/Date/DateObject.php';
require_once 'Zend/Date/Exception.php';
require_once 'Zend/Locale.php';
require_once 'Zend/Locale/Math.php';


/**
 * @category   Zend
 * @package    Zend_Date
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Date extends Zend_Date_DateObject {

    private $_Locale  = null;

    // Fractional second variables
    private $_Fractional = 0;
    private $_Precision  = 3;

    private static $_Options = array('format_type' => 'iso');

    // Class wide Date Constants
    // day formats
    const DAY            = 'DAY';            // d - 2 digit day of month, 01-31
    const DAY_SHORT      = 'DAY_SHORT';      // j - 1,2 digit day of month, 1-31

    const DAY_SUFFIX     = 'DAY_SUFFIX';     // S - english suffix day of month, st-th
    const DAY_OF_YEAR    = 'DAY_OF_YEAR';    // z - Number of day of year

    const WEEKDAY        = 'WEEKDAY';        // l - full day name - locale aware, Monday - Sunday
    const WEEKDAY_SHORT  = 'WEEKDAY_SHORT';  // D - 3 letter day of week - locale aware, Mon-Sun
    const WEEKDAY_NARROW = 'WEEKDAY_NARROW'; // --- 1 letter day name - locale aware, M-S
    const WEEKDAY_NAME   = 'WEEKDAY_NAME';   // --- 2 letter day name - locale aware,Mo-Su

    const WEEKDAY_8601   = 'WEEKDAY_8601';   // N - digit weekday ISO 8601, 1-7 1 = monday, 7=sunday
    const WEEKDAY_DIGIT  = 'WEEKDAY_DIGIT';  // w - weekday, 0-6 0=sunday, 6=saturday

    // week formats
    const WEEK           = 'WEEK';           // W - number of week ISO8601, 1-53

    // month formats
    const MONTH          = 'MONTH';          // m - 2 digit month, 01-12
    const MONTH_SHORT    = 'MONTH_SHORT';    // n - 1 digit month, no leading zeros, 1-12

    const MONTH_DAYS     = 'MONTH_DAYS';     // t - Number of days this month

    const MONTH_NAME        = 'MONTH_NAME';         // F - full month name - locale aware, January-December
    const MONTH_NAME_SHORT  = 'MONTH_NAME_SHORT';  // M - 3 letter monthname - locale aware, Jan-Dec
    const MONTH_NAME_NARROW = 'MONTH_NAME_NARROW'; // --- 1 letter month name - locale aware, J-D

    // year formats
    const YEAR           = 'YEAR';           // Y - 4 digit year
    const YEAR_SHORT     = 'YEAR_SHORT';     // y - 2 digit year, leading zeros 00-99

    const YEAR_8601      = 'YEAR_8601';      // o - number of year ISO8601
    const YEAR_SHORT_8601= 'YEAR_SHORT_8601';// --- 2 digit number of year ISO8601

    const LEAPYEAR       = 'LEAPYEAR';       // L - is leapyear ?, 0-1

    // time formats
    const MERIDIEM       = 'MERIDIEM';       // A,a - AM/PM - locale aware, AM/PM
    const SWATCH         = 'SWATCH';         // B - Swatch Internet Time

    const HOUR           = 'HOUR';           // H - 2 digit hour, leading zeros, 00-23
    const HOUR_SHORT     = 'HOUR_SHORT';     // G - 1 digit hour, no leading zero, 0-23

    const HOUR_AM        = 'HOUR_AM';        // h - 2 digit hour, leading zeros, 01-12 am/pm
    const HOUR_SHORT_AM  = 'HOUR_SHORT_AM';  // g - 1 digit hour, no leading zero, 1-12 am/pm

    const MINUTE         = 'MINUTE';         // i - 2 digit minute, leading zeros, 00-59
    const MINUTE_SHORT   = 'MINUTE_SHORT';   // --- 1 digit minute, no leading zero, 0-59

    const SECOND         = 'SECOND';         // s - 2 digit second, leading zeros, 00-59
    const SECOND_SHORT   = 'SECOND_SHORT';   // --- 1 digit second, no leading zero, 0-59

    const MILLISECOND    = 'MILLISECOND';    // --- milliseconds

    // timezone formats
    const TIMEZONE_NAME  = 'TIMEZONE_NAME';  // e - timezone string
    const DAYLIGHT       = 'DAYLIGHT';       // I - is Daylight saving time ?, 0-1
    const GMT_DIFF       = 'GMT_DIFF';       // O - GMT difference, -1200 +1200
    const GMT_DIFF_SEP   = 'GMT_DIFF_SEP';   // P - seperated GMT diff, -12:00 +12:00
    const TIMEZONE       = 'TIMEZONE';       // T - timezone, EST, GMT, MDT
    const TIMEZONE_SECS  = 'TIMEZONE_SECS';  // Z - timezone offset in seconds, -43200 +43200

    // date strings
    const ISO_8601       = 'ISO_8601';       // c - ISO 8601 date string
    const RFC_2822       = 'RFC_2822';       // r - RFC 2822 date string
    const TIMESTAMP      = 'TIMESTAMP';      // U - unix timestamp

    // additional formats
    const ERA            = 'ERA';            // --- short name of era, locale aware,
    const ERA_NAME       = 'ERA_NAME';       // --- full name of era, locale aware,
    const DATES          = 'DATES';          // --- standard date, locale aware
    const DATE_FULL      = 'DATE_FULL';      // --- full date, locale aware
    const DATE_LONG      = 'DATE_LONG';      // --- long date, locale aware
    const DATE_MEDIUM    = 'DATE_MEDIUM';    // --- medium date, locale aware
    const DATE_SHORT     = 'DATE_SHORT';     // --- short date, locale aware
    const TIMES          = 'TIMES';          // --- standard time, locale aware
    const TIME_FULL      = 'TIME_FULL';      // --- full time, locale aware
    const TIME_LONG      = 'TIME_LONG';      // --- long time, locale aware
    const TIME_MEDIUM    = 'TIME_MEDIUM';    // --- medium time, locale aware
    const TIME_SHORT     = 'TIME_SHORT';     // --- short time, locale aware
    const ATOM           = 'ATOM';           // --- DATE_ATOM
    const COOKIE         = 'COOKIE';         // --- DATE_COOKIE
    const RFC_822        = 'RFC_822';        // --- DATE_RFC822
    const RFC_850        = 'RFC_850';        // --- DATE_RFC850
    const RFC_1036       = 'RFC_1036';       // --- DATE_RFC1036
    const RFC_1123       = 'RFC_1123';       // --- DATE_RFC1123
    const RFC_3339       = 'RFC_3339';       // --- DATE_RFC3339
    const RSS            = 'RSS';            // --- DATE_RSS
    const W3C            = 'W3C';            // --- DATE_W3C


    /**
     * Generates the standard date object, could be a unix timestamp, localized date,
     * string, integer and so on. Also parts of dates or time are supported
     * Always set the default timezone: http://php.net/date_default_timezone_set
     * For example, in your bootstrap: date_default_timezone_set('America/Los_Angeles');
     * For detailed instructions please look in the docu.
     *
     * @param  string|integer|Zend_Date  $date    OPTIONAL Date value or value of date part to set
                                                           ,depending on $part. If null the actual time is set
     * @param  string                    $part    OPTIONAL Defines the input format of $date
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function __construct($date = null, $part = null, $locale = null)
    {
        if (Zend_Locale::isLocale($date)) {
            $locale = $date;
            $date = null;
            $part = null;
        } else if (Zend_Locale::isLocale($part)) {
            $locale = $part;
            $part = null;
        }

        $this->setLocale($locale);

        // set the timezone and offset for $this
        $zone = @date_default_timezone_get();
        if ($zone !== 'UTC') {
            $this->setTimezone($zone);
        }

        if (is_string($date) && defined("self::".$date)) {
            $part = $date;
            $date = null;
        }

        if (is_null($date)) {
            $date = Zend_Date::now();
            if (($part !== null) && ($part !== Zend_Date::TIMESTAMP)) {
                $date = $date->get($part);
            }
        }

        if (($date instanceof Zend_TimeSync_Ntp) or 
            ($date instanceof Zend_TimeSync_Sntp)) {
            $date = $date->getInfo();
            $date = $this->_getTime($date['offset']);
            $part = null;
        }

        // set datepart
        if (($part !== null && $part !== Zend_Date::TIMESTAMP) or (!is_numeric($date))) {
            $this->setUnixTimestamp(0);
            $this->set($date, $part, $this->_Locale);
        } else {
            $this->setUnixTimestamp($date);
        }
    }


    /**
     * Sets class wide options, if no option was given, the actual set options will be returned
     *
     * @param  array  $options  Options to set
     * @throws Zend_Date_Exception
     * @return Options array if no option was given 
     */
    public static function setOptions(array $options = array())
    {
        if (empty($options)) {
            return self::$_Options;
        }
        foreach ($options as $name => $value) {
            $name  = strtolower($name);
            $value = strtolower($value);

            if (isset(self::$_Options[$name])) {
                switch($name) {
                    case 'format_type' :
                        if (($value != 'php') && ($value != 'iso')) {
                            throw new Zend_Date_Exception("Unknown format type ($value) for dates, only 'iso' and 'php' supported", $value);
                        }
                }
                self::$_Options[$name] = $value;
            }
            else {
                throw new Zend_Date_Exception("Unknown option: $name = $value");
            }
        }
    }


    /**
     * Returns this object's internal UNIX timestamp (equivalent to Zend_Date::TIMESTAMP).
     * If the timestamp is too large for integers, then the return value will be a string.
     * This function does not return the timestamp as an object.
     * Use clone() or copyPart() instead.
     *
     * @return integer|string  UNIX timestamp
     */
    public function getTimestamp()
    {
        return $this->getUnixTimestamp();
    }


    /**
     * Returns the calculated timestamp
     * HINT: timestamps are always GMT
     *
     * @param  string                    $calc    Type of calculation to make
     * @param  string|integer|Zend_Date  $stamp   Timestamp to calculate, when null the actual timestamp is calculated
     * @return Zend_Date|integer
     * @throws Zend_Date_Exception
     */
    private function _timestamp($calc, $stamp)
    {
        if ($stamp instanceof Zend_Date) {
            // extract timestamp from object
            $stamp = $stamp->get(Zend_Date::TIMESTAMP, true);
        }

        if ($calc === 'set') {
            $return = $this->setUnixTimestamp($stamp);
        } else {
            $return = $this->_calcdetail($calc, $stamp, Zend_Date::TIMESTAMP, null);
        }
        if ($calc != 'cmp') {
            return $this;
        }
        return $return;
    }


    /**
     * Sets a new timestamp
     *
     * @param  integer|string|Zend_Date  $timestamp  Timestamp to set
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function setTimestamp($timestamp)
    {
        return $this->_timestamp('set', $timestamp);
    }


    /**
     * Adds a timestamp
     *
     * @param  integer|string      $timestamp  Timestamp to add
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function addTimestamp($timestamp)
    {
        return $this->_timestamp('add', $timestamp);
    }


    /**
     * Subtracts a timestamp
     *
     * @param  integer|string      $timestamp  Timestamp to sub
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function subTimestamp($timestamp)
    {
        return $this->_timestamp('sub', $timestamp);
    }


    /**
     * Compares two timestamps, returning the difference as integer
     *
     * @param  integer|string      $timestamp  Timestamp to compare
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareTimestamp($timestamp)
    {
        return $this->_timestamp('cmp', $timestamp);
    }


    /**
     * Returns a string representation of the object
     * Supported format tokens are:
     * G - era, y - year, Y - ISO year, M - month, w - week of year, D - day of year, d - day of month