forked from GNUsocial/gnu-social
243 lines
8.1 KiB
PHP
243 lines
8.1 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker: */
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// {{{ Header
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/**
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* Class to convert date strings between Gregorian and Human calendar formats
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*
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* The Human Calendar format has been proposed by Scott Flansburg and can be
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* explained as follows:
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* The year is made up of 13 months
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* Each month has 28 days
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* Counting of months starts from 0 (zero) so the months will run from 0 to 12
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* New Years day (00) is a monthless day
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* Note: Leap Years are not yet accounted for in the Human Calendar system
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*
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* PHP versions 4 and 5
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*
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* LICENSE:
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*
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* Copyright (c) 1997-2006 Allan Kent
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted under the terms of the BSD License.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @category Date and Time
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* @package Date
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* @author Allan Kent <allan@lodestone.co.za>
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* @copyright 1997-2006 Allan Kent
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* @license http://www.opensource.org/licenses/bsd-license.php
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* BSD License
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* @version CVS: $Id$
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* @link http://pear.php.net/package/Date
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* @since File available since Release 1.3
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*/
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// }}}
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// {{{ Class: Date_Human
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/**
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* Class to convert date strings between Gregorian and Human calendar formats
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*
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* The Human Calendar format has been proposed by Scott Flansburg and can be
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* explained as follows:
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* The year is made up of 13 months
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* Each month has 28 days
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* Counting of months starts from 0 (zero) so the months will run from 0 to 12
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* New Years day (00) is a monthless day
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* Note: Leap Years are not yet accounted for in the Human Calendar system
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*
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* @category Date and Time
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* @package Date
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* @author Allan Kent <allan@lodestone.co.za>
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* @copyright 1997-2005 Allan Kent
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* @license http://www.opensource.org/licenses/bsd-license.php
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* BSD License
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* @version Release: 1.5.0a4
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* @link http://pear.php.net/package/Date
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* @since Class available since Release 1.3
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*/
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class Date_Human
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{
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// {{{ gregorianToHuman()
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/**
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* Returns an associative array containing the converted date information
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* in 'Human Calendar' format.
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*
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* If the day is New Years Day, the function will return
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* "hdom" => 0
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* "hdow" => 0
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* "hwom" => 0
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* "hwoy" => 0
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* "hmoy" => -1
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* Since 0 is a valid month number under the Human Calendar, I have left
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* the month as -1 for New Years Day.
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*
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* @param int $day in DD format, default current local day
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* @param int $month in MM format, default current local month
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* @param int $year in CCYY format, default to current local year
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*
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* @return associative array(
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* hdom, // Human Day Of Month, starting at 1
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* hdow, // Human Day Of Week, starting at 1
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* hwom, // Human Week of Month, starting at 1
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* hwoy, // Human Week of Year, starting at 1
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* hmoy, // Human Month of Year, starting at 0
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* )
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* @access public
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* @static
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*/
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public function gregorianToHuman($day = 0, $month = 0, $year = 0)
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{
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/*
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* Check to see if any of the arguments are empty
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* If they are then populate the $dateinfo array
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* Then check to see which arguments are empty and fill
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* those with the current date info
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*/
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if ((empty($day) || (empty($month)) || empty($year))) {
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$dateinfo = getdate(time());
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}
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if (empty($day)) {
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$day = $dateinfo["mday"];
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}
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if (empty($month)) {
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$month = $dateinfo["mon"];
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}
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if (empty($year)) {
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$year = $dateinfo["year"];
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}
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/*
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* We need to know how many days into the year we are
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*/
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$dateinfo = getdate(mktime(0, 0, 0, $month, $day, $year));
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$dayofyear = $dateinfo["yday"];
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/*
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* Human Calendar starts at 0 for months and the first day of the year
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* is designated 00, so we need to start our day of the year at 0 for
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* these calculations.
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* Also, the day of the month is calculated with a modulus of 28.
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* Because a day is 28 days, the last day of the month would have a
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* remainder of 0 and not 28 as it should be. Decrementing $dayofyear
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* gets around this.
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*/
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$dayofyear--;
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/*
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* 28 days in a month...
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*/
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$humanMonthOfYear = floor($dayofyear / 28);
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/*
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* If we are in the first month then the day of the month is $dayofyear
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* else we need to find the modulus of 28.
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*/
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if ($humanMonthOfYear == 0) {
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$humanDayOfMonth = $dayofyear;
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} else {
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$humanDayOfMonth = ($dayofyear) % 28;
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}
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/*
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* Day of the week is modulus 7
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*/
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$humanDayOfWeek = $dayofyear % 7;
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/*
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* We can now increment $dayofyear back to it's correct value for
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* the remainder of the calculations
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*/
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$dayofyear++;
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/*
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* $humanDayOfMonth needs to be incremented now - recall that we fudged
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* it a bit by decrementing $dayofyear earlier
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* Same goes for $humanDayOfWeek
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*/
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$humanDayOfMonth++;
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$humanDayOfWeek++;
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/*
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* Week of the month is day of the month divided by 7, rounded up
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* Same for week of the year, but use $dayofyear instead $humanDayOfMonth
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*/
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$humanWeekOfMonth = ceil($humanDayOfMonth / 7);
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$humanWeekOfYear = ceil($dayofyear / 7);
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/*
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* Return an associative array of the values
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*/
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return array("hdom" => $humanDayOfMonth,
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"hdow" => $humanDayOfWeek,
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"hwom" => $humanWeekOfMonth,
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"hwoy" => $humanWeekOfYear,
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"hmoy" => $humanMonthOfYear);
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}
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// }}}
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// {{{ humanToGregorian()
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/**
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* Returns unix timestamp for a given Human Calendar date
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*
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* @param int $day in DD format
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* @param int $month in MM format
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* @param int $year in CCYY format, default to current local year
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*
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* @return int unix timestamp of date
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* @access public
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* @static
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*/
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public function humanToGregorian($day, $month, $year = 0)
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{
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/*
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* Check to see if the year has been passed through.
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* If not get current year
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*/
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if (empty($year)) {
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$dateinfo = getdate(time());
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$year = $dateinfo["year"];
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}
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/*
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* We need to get the day of the year that we are currently at so that
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* we can work out the Gregorian Month and day
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*/
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$DayOfYear = $month * 28;
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$DayOfYear += $day;
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/*
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* Human Calendar starts at 0, so we need to increment $DayOfYear
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* to take into account the day 00
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*/
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$DayOfYear++;
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/*
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* the mktime() function will correctly calculate the date for out of
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* range values, so putting $DayOfYear instead of the day of the month
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* will work fine.
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*/
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$GregorianTimeStamp = mktime(0, 0, 0, 1, $DayOfYear, $year);
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return $GregorianTimeStamp;
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}
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// }}}
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}
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// }}}
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/*
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* Local variables:
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* mode: php
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* tab-width: 4
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* c-basic-offset: 4
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* c-hanging-comment-ender-p: nil
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* End:
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*/
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