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<?php
/**
* Base date object. Stores date information only (without a time). Internally the date is stored as a
* unix timestamp, but the time portion of it is not used. If you need a date with a time, use qCal_DateTime
* @package qCal
* @subpackage qCal_Date
* @copyright Luke Visinoni (luke.visinoni@gmail.com)
* @author Luke Visinoni (luke.visinoni@gmail.com)
* @license GNU Lesser General Public License
*/
class qCal_Date {
/**
* @var unix timestamp
*/
protected $date;
/**
* @var int The start day of the week (defaults to Monday)
*/
protected $wkst = 1;
/**
* @var array The results of a getdate() call
*/
protected $dateArray = array();
/**
* @var string The date format that is used when outputting via __toString()
*/
protected $format = "m/d/Y";
/**
* @var array This is just a mapping of weekdays to 0 (for Sunday) through 6 (for Saturday)
* which is a direct correlation with PHP's date function's "w" metacharacter
*/
protected $weekdays = array(
"sunday",
"monday",
"tuesday",
"wednesday",
"thursday",
"friday",
"saturday",
);
/**
* @var array This is an array of months starting at 1 and ending on 12
*/
protected $months = array(
1 => "january",
2 => "february",
3 => "march",
4 => "april",
5 => "may",
6 => "june",
7 => "july",
8 => "august",
9 => "september",
10 => "october",
11 => "november",
12 => "december",
);
/**
* @var array The month in a two-dimensional array (picture a calendar)
*/
protected $monthMap = array();
/**
* Class constructor
* @param int The year of this date
* @param int The month of this date
* @param int The day of this date
*/
public function __construct($year = null, $month = null, $day = null, $rollover = false) {
$this->setDate($year, $month, $day, $rollover);
}
/**
* Set the date of this class
* The date defaults to now. If any part of the date is missing, it will default to whatever "now"'s
* date portion is. For instance, if the year provided is 2006 and no other portion is given, it will
* default to today's month and day, but in the year 2006. If, for any reason the date defaults to a
* nonsensical date, an exception will be thrown. For instance, if you specify the year as 2006, and
* the current date is february 29th, an exception will be thrown because the 29th of February does not
* exist in 2006.
* @param int The year of this date
* @param int The month of this date
* @param int The day of this date
* @throws qCal_Date_Exception_InvalidDate
*/
protected function setDate($year = null, $month = null, $day = null, $rollover = false) {
$now = getdate();
if (is_null($year)) {
$year = $now['year'];
}
if (is_null($month)) {
$month = $now['mon'];
}
if (is_null($day)) {
$day = $now['mday'];
}
$this->date = gmmktime(0, 0, 0, $month, $day, $year);
$this->dateArray = self::gmgetdate($this->date);
if (!$rollover) {
if ($this->dateArray["mday"] != $day || $this->dateArray["mon"] != $month || $this->dateArray["year"] != $year) {
throw new qCal_DateTime_Exception_InvalidDate("Invalid date specified for qCal_Date: \"{$month}/{$day}/{$year}\"");
}
}
// @todo Look into how much more efficient it might be to call date() only once and then break apart the result...
$formatString = "d|D|j|l|N|S|w|z|W|F|m|M|n|t|L|o|y|Y|c|r|U";
$keys = explode("|", $formatString);
$vals = explode("|", gmdate($formatString, $this->date));
$this->dateArray = array_merge($this->dateArray, array_combine($keys, $vals));
return $this;
}
/**
* This is a factory method. It allows you to create a date by string or by another date object (to make a copy)
*/
public static function factory($date) {
if (is_integer($date)) {
// @todo Handle timestamps
}
if (is_string($date)) {
if (!$timestamp = strtotime($date)) {
// if unix timestamp can't be created throw an exception
throw new qCal_Date_Exception_InvalidDate("Invalid or ambiguous date string passed to qCal_Date::factory()");
}
}
$date = self::gmgetdate($timestamp);
$newdate = gmmktime(0, 0, 0, $date['mon'], $date['mday'], $date['year']);
$newdate = self::gmgetdate($newdate);
return new qCal_Date($newdate['year'], $newdate['mon'], $newdate['mday']);
}
/**
* Set the format that should be used when calling either __toString() or format() without an argument.
* @param string $format
*/
public function setFormat($format) {
$this->format = (string) $format;
return $this;
}
/**
* Formats the date according to either the existing $this->format, or if the $format arg is passed
* in, it uses that.
* @param string The format that is to be used (according to php's date function). Only date-related metacharacters work.
*/
public function format($format) {
$escape = false;
$meta = str_split($format);
$output = array();
foreach($meta as $char) {
if ($char == '\\') {
$escape = true;
continue;
}
if (!$escape && array_key_exists($char, $this->dateArray)) {
$output[] = $this->dateArray[$char];
} else {
$output[] = $char;
}
// reset this to false after every iteration that wasn't "continued"
$escape = false;
}
return implode($output);
}
/**
* Getters
* The next dozen or so methods are just your standard getters for things such as month, day, year, week day, etc.
*/
/**
* Get the month (number) of this date
* @return integer A number between 1 and 12 inclusively
*/
public function getMonth() {
return $this->dateArray["mon"];
}
/**
* Get the month of this date
* @return string The actual name of the month, capitalized
*/
public function getMonthName() {
return $this->dateArray["month"];
}
/**
* Get the day of the month
* @return integer A number between 1 and 31 inclusively
*/
public function getDay() {
return $this->dateArray["mday"];
}
/**
* Get the day of the year
* @return integer A number between 0 and 365 inclusively
*/
public function getYearDay($startFromOne = false) {
$yearDay = $this->dateArray["yday"] + (integer) $startFromOne;
return $yearDay;
}
/**
* Find how many days until the end of the year.
* For instance, if the date is December 25th, there are 6 days until the end of the year
*/
public function getNumDaysUntilEndOfYear() {
$yearday = $this->getYearDay(true);
return $this->getNumDaysInYear() - $yearday;
}
/**
* Get how many months until the end of the year
* @todo This is really rudimentary. There is more to this, but this works for now...
*/
public function getNumMonthsUntilEndOfYear() {
return 12 - $this->getMonth();
}
/**
* Get the amount of days in the year (365 unless it is a leap-year, then it's 366)
*/
public function getNumDaysInYear() {
return ($this->isLeapYear()) ? 366 : 365;
}
/**
* Return the first day of the month as a qCal_Date object
* @return qCal_Date The first day of the month
*/
public function getFirstDayOfMonth() {
return new qCal_Date($this->getYear(), $this->getMonth(), 1);
}
/**
* Return the last day of the month as a qCal_Date object
* @return qCal_Date The last day of the month
*/
public function getLastDayOfMonth() {
$lastday = $this->format("t");
return new qCal_Date($this->getYear(), $this->getMonth(), $lastday);
}
/**
* Get the number of days until the end of the month
*/
public function getNumDaysUntilEndOfMonth() {
return $this->getNumDaysInMonth() - $this->getDay();
}
/**
* Get the year
* @return integer The year of this date, for example 1999
*/
public function getYear() {
return $this->dateArray["year"];
}
/**
* Get the day of the week
* @return integer A number between 0 (for Sunday) and 6 (for Saturday).
*/
public function getWeekDay() {
return $this->dateArray["wday"];
}
/**
* Get the day of the week
* @return string The actual name of the day of the week, capitalized
*/
public function getWeekDayName() {
return $this->dateArray["weekday"];
}
/**
* Get the amount of days in the current month of this year
* @return integer The number of days in the month
*/
public function getNumDaysInMonth() {
return $this->dateArray["t"];
}
/**
* Get the week of the year
* @return integer The week of the year (0-51 I think)
* @todo This is not accurate if the week start isn't monday. I need to adjust for that
*/
public function getWeekOfYear() {
return $this->dateArray["W"];
}
/**
* Get how many weeks until the end of the year
* @todo This is really rudimentary. There is more to this, but this works for now...
*/
public function getWeeksUntilEndOfYear() {
return 52 - $this->getWeekOfYear();
}
/**
* Determine if this is a leap year
*/
public function isLeapYear() {
return (boolean) $this->dateArray["L"];
}
/**
* Get a unix timestamp for the date
* @return integer The amount of seconds since unix epoch (January 1, 1970 UTC)
*/
public function getUnixTimestamp() {
return $this->dateArray[0];
}
/**
* Date magic
* This component is capable of doing some really convenient things with dates.
* It is capable of determining things such as how many days until the end of the year,
* which monday of the month it is (ie: third monday in february), etc.
*/
/**
* Determine the number or Tuesdays (or whatever day of the week this date is) since the
* beginning or end of the month.
* @param integer $xth A positive or negative number that determines which weekday of the month we want
* @param string|integer $weekday Either Sunday-Saturday or 0-6 to specify the weekday we want
* @param string|integer $month Either January-December or 1-12 to specify the month we want
* @param integer $year A valid year to specify which year we want
*/
public function getXthWeekdayOfMonth($xth, $weekday = null, $month = null, $year = null) {
$negpos = substr($xth, 0, 1);
if ($negpos == "+" || $negpos == "-") {
$xth = (integer) substr($xth, 1);
} else {
$negpos = "+";
}
if (is_null($weekday)) {
$weekday = $this->getWeekday();
}
if (ctype_digit((string) $weekday)) {
if (!array_key_exists($weekday, $this->weekdays)) {
throw new qCal_Date_Exception_InvalidWeekday("\"$weekday\" is not a valid weekday.");
}
} else {
$weekday = strtolower($weekday);
if (!in_array($weekday, $this->weekdays)) {
throw new qCal_Date_Exception_InvalidWeekday("\"$weekday\" is not a valid weekday.");
}
$wdays = array_flip($this->weekdays);
$weekday = $wdays[$weekday];
}
if (is_null($month)) {
$month = $this->getMonth();
}
if (ctype_digit((string) $month)) {
if (!array_key_exists($month, $this->months)) {
throw new qCal_Date_Exception_InvalidMonth("\"$month\" is not a valid month.");
}
} else {
$month = strtolower($month);
if (!in_array($month, $this->months)) {
throw new qCal_Date_Exception_InvalidMonth("\"$month\" is not a valid month.");
}
$mons = array_flip($this->months);
$month = $mons[$month];
}
if (is_null($year)) {
$year = $this->getYear();
}
if (!ctype_digit((string) $year) || strlen($year) != 4) {
throw new qCal_Date_Exception_InvalidYear("\"$year\" is not a valid year.");
}
// now, using the year, month and numbered weekday, we need to find the actual day of the month...
$firstofmonth = new qCal_Date($year, $month, 1);
$numdaysinmonth = $firstofmonth->getNumDaysInMonth();
$numweekdays = 0; // the number of weekdays that have occurred (in the loop)
$foundday = false;
if ($negpos == "+") {
$day = 1;
$wday = $firstofmonth->getWeekday();
// while we are in the current month, loop
while ($day <= $numdaysinmonth) {
// if the specified weekday == the current week day in the loop
if ($weekday == $wday) {
$numweekdays++;
if ($numweekdays == $xth) {
// break out of the loop, we've found the right day! yay!
$foundday = $day;
break;
}
}
if ($wday == 6) $wday = 0; // reset to Sunday after Saturday
else $wday++;
$day++;
}
} else {
$day = $numdaysinmonth;
$lastofmonth = $firstofmonth->getLastDayOfMonth();
$wday = $lastofmonth->getWeekday();
while ($day >= 1) {
if ($weekday == $wday) {
$numweekdays++;
if ($numweekdays == $xth) {
// break out of the loop, we've found the right day! yay!
$foundday = $day;
break;
}
}
if ($wday == 0) $wday = 6; // reset to Saturday after Sunday
else $wday--;
$day--;
}
}
if ($foundday && checkdate($month, $day, $year)) {
$date = new qCal_Date($year, $month, $day);
} else {
if ($day == 32) {
throw new qCal_DateTime_Exception_InvalidDate("You have specified an incorrect number of days for qCal_Date::getXthWeekdayOfMonth()");
} else {
throw new qCal_DateTime_Exception_InvalidDate("You have entered an invalid date.");
}
}
return $date;
}
/**
* Determine the number or Tuesdays (or whatever day of the week this date is) since the
* beginning or end of the year.
*/
public function getXthWeekdayOfYear($xth, $weekday = null, $year = null) {
$negpos = substr($xth, 0, 1);
if ($negpos == "+" || $negpos == "-") {
$xth = (integer) substr($xth, 1);
} else {
$negpos = "+";
}
if (is_null($weekday)) {
$weekday = $this->getWeekday();
}
if (ctype_digit((string) $weekday)) {
if (!array_key_exists($weekday, $this->weekdays)) {
throw new qCal_Date_Exception_InvalidWeekday("\"$weekday\" is not a valid weekday.");
}
} else {
$weekday = strtolower($weekday);
if (!in_array($weekday, $this->weekdays)) {
throw new qCal_Date_Exception_InvalidWeekday("\"$weekday\" is not a valid weekday.");
}
$wdays = array_flip($this->weekdays);
$weekday = $wdays[$weekday];
}
if (is_null($year)) {
$year = $this->getYear();
}
if (!ctype_digit((string) $year) || strlen($year) != 4) {
throw new qCal_Date_Exception_InvalidYear("\"$year\" is not a valid year.");
}
// now find the specified day by counting either forwards or backwards to the day in question
$firstofyear = new qCal_Date($year, 1, 1);
$numdaysinyear = ($firstofyear->isLeapYear()) ? 366 : 365;
$numweekdays = 0; // the number of weekdays that have occurred within the loop
$found = false; // whether or not the specified day has been found
if ($negpos == "+") {
// count forward
// loop over every day of every month looking for the right one
$day = 1;
$wday = $firstofyear->getWeekDay();
while ($day <= $numdaysinyear) {
// if the specified weekday == the current week day in the loop
if ($weekday == $wday) {
$numweekdays++;
if ($numweekdays == $xth) {
// break out of the loop, we've found the right day! yay!
$found = $day;
break;
}
}
if ($wday == 6) $wday = 0; // reset to Sunday after Saturday
else $wday++;
$day++;
}
} else {
// count backward
$lastofyear = new qCal_Date($year, 12, 31);
// count forward
// loop over every day of every month looking for the right one
$day = $numdaysinyear;
$wday = $lastofyear->getWeekDay();
while ($day >= 1) {
// if the specified weekday == the current week day in the loop
if ($weekday == $wday) {
$numweekdays++;
if ($numweekdays == $xth) {
// break out of the loop, we've found the right day! yay!
$found = $day;
break;
}
}
if ($wday == 0) $wday = 6; // reset to Saturday after Sunday
else $wday--;
$day--;
}
}
// @todo: Can't use checkdate here, so find another validation method...
if ($found) {
$date = new qCal_Date($year, 1, $found, true); // takes advantage of the rollover feature :)
} else {
throw new qCal_DateTime_Exception_InvalidDate("You have specified an incorrect number of days for qCal_Date::getXthWeekdayOfYear()");
}
return $date;
}
/**
* Magic methods
*/
/**
* Output the date as a string. Options are as follows:
* @return string The formatted date
*/
public function __toString() {
return $this->format($this->format);
}
/**
* Static methods
*/
/**
* Because PHP does not provide a gmgetdate() function, I borrowed this one from the
* comments on the getdate() function page on php.net
* @param integer The timestamp to use to create the date
*/
public static function gmgetdate($timestamp = null) {
$k = array('seconds','minutes','hours','mday','wday','mon','year','yday','weekday','month',0);
return(array_combine($k, split(":", gmdate('s:i:G:j:w:n:Y:z:l:F:U', is_null($timestamp) ? time() : $timestamp))));
}
}