Related
I've been using the following function fine until the other day when the clocks went forward:
function months($month_format="F") {
$array = array();
for ($i = 1; $i <=12; $i++) {
$array[$i]['string'] = date($month_format, mktime(0,0,0,$i));
$array[$i]['int'] = date('m', mktime(0,0,0,$i));
}
return $array;
}
It outputs an array with:
string[]
int[]
Since the other day (like 2 days ago, when the clocks went forward in the UK), the function seems to be showing me 2 march months and 0 Februarys....
Very very strange...
I'm using rethinkdb with their eachPosTime function... not sure if this is causing it.
I tried using a different function, but still using mktime:
function months(){
$start_month = 1;
$end_month = 12;
$start_year = date("Y");
$array = array();
for($m=$start_month; $m<=12; ++$m){
echo $m.'<br>';
$array[$m]['string'] = date('F', mktime(0,0,0,$m));
$array[$m]['int'] = date('m', mktime(0,0,0,$m));
if($start_month == 12 && $m==12 && $end_month < 12)
{
$m = 0;
$start_year = $start_year+1;
}
//echo date('F Y', mktime(0, 0, 0, $m, 1, $start_year)).'<br>';
if($m == $end_month) break;
}
return $array;
}
Still, I am having no luck.
Check the image here, which shows the output of the months() function:
Output of the months() function
This is not to do with the clocks changing, but the time of the month, and the entirely unhelpful signature of the mktime function.
When you leave out parameters from a "mktime" call, they are filled in with today's date. In your case, you specified month without day or year, so when you ask for mktime(0, 0, 0, 2); it will fill in today's day and year, and look for the 29th February 2021 - a day that doesn't exist. Since the time library "overflows" dates, this becomes the 1st March.
The solution is to pass an explicit day to "mktime", as in mktime(0,0,0,$m,1) or to use a less confusing function.
I'm trying to find a solution to a conditional based on the day of the week and a time range within that day. I've managed to hunt down the code for the day of the week but I can't find how to incorporate a time frame within the day?
For example:
IF today is Monday AND between 2pm and 4pm THEN do THIS
This is what I have...
<?php
date_default_timezone_set('Australia/Perth'); // PHP supported timezone
$script_tz = date_default_timezone_get();
// get current day:
$currentday = date('l'); ?>
<?php if ($currentday == Monday){ ?>
Monday
<?php } elseif ($currentday == Tuesday){ ?>
Tuesday
<?php } elseif ($currentday == Wednesday){ ?>
Wednesday
<?php } elseif ($currentday == Thursday){ ?>
Thursday
<?php } elseif ($currentday == Friday){ ?>
Friday
<?php } elseif ($currentday == Saturday){ ?>
Saturday
<?php } elseif ($currentday == Sunday){ ?>
Sunday
<?php } else { ?>
<?php } ?>
I'm not sure if this may help for the time frame?
Check day of week and time
Basically this:
<?php
if (date('l') === 'Monday' && date('G') >= 2 && date('G') < 4) {
// do something
}
You were missing quotes around the day names.
The condition I wrote will evaluate to true on Monday between 2 PM and 4 PM (while 4 PM itself will not, e.g. the last allowed values is 3:59 PM).
you could use different date/time components to streamline the code:
function between($value, $start, $end)
{
return $value > $start && $value <= $end;
}
$hours = date("G");
switch( date("N"))
{
case 1: //monday
if (between($hours,12 + 2,12 + 4 )) //using 24h format to avoid checking am/pm
{
// IF today is Monday AND between 2pm and 4pm THEN do THIS
}
break;
case 2: //tuesday
break;
//....
}
You'd better user date('N') as it is not language dependant and date('H') to take advantage of the 24h format that is better fit for time comparison.
function date_in_frame($test_date, $day, $start, $end){
$d = new Datetime($test_date);
return $d->format("N") == $day && $d->format("H") >= $start && $d->format("H") < $end;
}
//test if "now" is Monday between 2pm (14:00) and 4pm (15:59)
var_dump(date_in_frame("now", 0, 14, 16));
This code here checks a DateTime is between a start and end time.
<?php
$date = new DateTime('2019-11-18 12:49');
$start = new DateTime('2019-11-18 09:00');
$end = new DateTime('2019-11-18 17:00');
if ($date > $start && $date < $end) {
echo 'In the zone!';
}
Note.
$date->format('l'); will return Monday or whatever day it is.
$date->format('H:i'); will return 13:15 or whatever time it is.
Have a play! https://3v4l.org/XK5KR
All the conditions packed into an array is easier for maintenance.
A simplified example:
$ranges = [
['Monday',12,14, function(){echo "do something";}],
['Tuesday',12,14, function(){echo "do something on Tue";}],
//: more
];
$curWeekDay = date('l');
$hours = date("G");
foreach($ranges as $range){
if($curWeekDay == $range[0] AND $hours >= $range[1] AND $hours < $range[2]){
$range[3]();
}
}
Output on Tue 13:25:
do something on Tue
I'm trying to calculate National Sovereignty Day of Argentina which is celebrated on the Monday closest to 20 November.
I tried to find PHP solutions here but just found a Ruby solution: Get the closest date of a specific week day
How can I implement this for PHP?
Using $date->format("N") you will get a numeric representation of the weekday (1-7 for Monday-Sunday). If its greater than 4, which is greater than Thursday, select the next Monday. If not, it's the previous Monday.
If $date->format("N") === 1, it's the date provided, and we don't need any modifications.
$date = new DateTime("November 20th");
$dayOfWeek = $date->format("N");
if ($dayOfWeek > 1) {
$date->modify($dayOfWeek > 4 ? 'next monday' : 'previous monday');
}
echo $date->format("Y-m-d");
Live demo
Could try something like this:
<?php
function getSovDay($year)
{
$date = new \DateTime($year."-11-20");
$weekDay = $date->format("N");
if ($weekDay == 1)
{
return $date;
} elseif ($weekDay <= 4) {
return $date->modify("previous monday");
} else {
return $date->modify("next monday");
}
}
for($i = 2000; $i <= 2200; $i++)
{
echo getSovDay($i)->format("Y-m-d")."\n";
}
I want to take a date and work out its week number.
So far, I have the following. It is returning 24 when it should be 42.
<?php
$ddate = "2012-10-18";
$duedt = explode("-",$ddate);
$date = mktime(0, 0, 0, $duedt[2], $duedt[1],$duedt[0]);
$week = (int)date('W', $date);
echo "Weeknummer: ".$week;
?>
Is it wrong and a coincidence that the digits are reversed? Or am I nearly there?
Today, using PHP's DateTime objects is better:
<?php
$ddate = "2012-10-18";
$date = new DateTime($ddate);
$week = $date->format("W");
echo "Weeknummer: $week";
It's because in mktime(), it goes like this:
mktime(hour, minute, second, month, day, year);
Hence, your order is wrong.
<?php
$ddate = "2012-10-18";
$duedt = explode("-", $ddate);
$date = mktime(0, 0, 0, $duedt[1], $duedt[2], $duedt[0]);
$week = (int)date('W', $date);
echo "Weeknummer: " . $week;
?>
$date_string = "2012-10-18";
echo "Weeknummer: " . date("W", strtotime($date_string));
Use PHP's date function
http://php.net/manual/en/function.date.php
date("W", $yourdate)
This get today date then tell the week number for the week
<?php
$date=date("W");
echo $date." Week Number";
?>
Just as a suggestion:
<?php echo date("W", strtotime("2012-10-18")); ?>
Might be a little simpler than all that lot.
Other things you could do:
<?php echo date("Weeknumber: W", strtotime("2012-10-18 01:00:00")); ?>
<?php echo date("Weeknumber: W", strtotime($MY_DATE)); ?>
Becomes more difficult when you need year and week.
Try to find out which week is 01.01.2017.
(It is the 52nd week of 2016, which is from Mon 26.12.2016 - Sun 01.01.2017).
After a longer search I found
strftime('%G-%V',strtotime("2017-01-01"))
Result: 2016-52
https://www.php.net/manual/de/function.strftime.php
ISO-8601:1988 week number of the given year, starting with the first week of the year with at least 4 weekdays, with Monday being the start of the week. (01 through 53)
The equivalent in mysql is DATE_FORMAT(date, '%x-%v')
https://www.w3schools.com/sql/func_mysql_date_format.asp
Week where Monday is the first day of the week (01 to 53).
Could not find a corresponding solution with DateTime.
At least not without solutions like "+1day, last monday".
Edit: since strftime is now deprecated, maybe you can also use date.
Didn't verify it though.
date('o-W',strtotime("2017-01-01"));
I have tried to solve this question for years now, I thought I found a shorter solution but had to come back again to the long story. This function gives back the right ISO week notation:
/**
* calcweek("2018-12-31") => 1901
* This function calculates the production weeknumber according to the start on
* monday and with at least 4 days in the new year. Given that the $date has
* the following format Y-m-d then the outcome is and integer.
*
* #author M.S.B. Bachus
*
* #param date-notation PHP "Y-m-d" showing the data as yyyy-mm-dd
* #return integer
**/
function calcweek($date) {
// 1. Convert input to $year, $month, $day
$dateset = strtotime($date);
$year = date("Y", $dateset);
$month = date("m", $dateset);
$day = date("d", $dateset);
$referenceday = getdate(mktime(0,0,0, $month, $day, $year));
$jan1day = getdate(mktime(0,0,0,1,1,$referenceday[year]));
// 2. check if $year is a leapyear
if ( ($year%4==0 && $year%100!=0) || $year%400==0) {
$leapyear = true;
} else {
$leapyear = false;
}
// 3. check if $year-1 is a leapyear
if ( (($year-1)%4==0 && ($year-1)%100!=0) || ($year-1)%400==0 ) {
$leapyearprev = true;
} else {
$leapyearprev = false;
}
// 4. find the dayofyearnumber for y m d
$mnth = array(0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334);
$dayofyearnumber = $day + $mnth[$month-1];
if ( $leapyear && $month > 2 ) { $dayofyearnumber++; }
// 5. find the jan1weekday for y (monday=1, sunday=7)
$yy = ($year-1)%100;
$c = ($year-1) - $yy;
$g = $yy + intval($yy/4);
$jan1weekday = 1+((((intval($c/100)%4)*5)+$g)%7);
// 6. find the weekday for y m d
$h = $dayofyearnumber + ($jan1weekday-1);
$weekday = 1+(($h-1)%7);
// 7. find if y m d falls in yearnumber y-1, weeknumber 52 or 53
$foundweeknum = false;
if ( $dayofyearnumber <= (8-$jan1weekday) && $jan1weekday > 4 ) {
$yearnumber = $year - 1;
if ( $jan1weekday = 5 || ( $jan1weekday = 6 && $leapyearprev )) {
$weeknumber = 53;
} else {
$weeknumber = 52;
}
$foundweeknum = true;
} else {
$yearnumber = $year;
}
// 8. find if y m d falls in yearnumber y+1, weeknumber 1
if ( $yearnumber == $year && !$foundweeknum) {
if ( $leapyear ) {
$i = 366;
} else {
$i = 365;
}
if ( ($i - $dayofyearnumber) < (4 - $weekday) ) {
$yearnumber = $year + 1;
$weeknumber = 1;
$foundweeknum = true;
}
}
// 9. find if y m d falls in yearnumber y, weeknumber 1 through 53
if ( $yearnumber == $year && !$foundweeknum ) {
$j = $dayofyearnumber + (7 - $weekday) + ($jan1weekday - 1);
$weeknumber = intval( $j/7 );
if ( $jan1weekday > 4 ) { $weeknumber--; }
}
// 10. output iso week number (YYWW)
return ($yearnumber-2000)*100+$weeknumber;
}
I found out that my short solution missed the 2018-12-31 as it gave back 1801 instead of 1901. So I had to put in this long version which is correct.
How about using the IntlGregorianCalendar class?
Requirements: Before you start to use IntlGregorianCalendar make sure that libicu or pecl/intl is installed on the Server.
So run on the CLI:
php -m
If you see intl in the [PHP Modules] list, then you can use IntlGregorianCalendar.
DateTime vs IntlGregorianCalendar:
IntlGregorianCalendar is not better then DateTime. But the good thing about IntlGregorianCalendar is that it will give you the week number as an int.
Example:
$dateTime = new DateTime('21-09-2020 09:00:00');
echo $dateTime->format("W"); // string '39'
$intlCalendar = IntlCalendar::fromDateTime ('21-09-2020 09:00:00');
echo $intlCalendar->get(IntlCalendar::FIELD_WEEK_OF_YEAR); // integer 39
<?php
$ddate = "2012-10-18";
$duedt = explode("-",$ddate);
$date = mktime(0, 0, 0, $duedt[1], $duedt[2],$duedt[0]);
$week = (int)date('W', $date);
echo "Weeknummer: ".$week;
?>
You had the params to mktime wrong - needs to be Month/Day/Year, not Day/Month/Year
To get the week number for a date in North America I do like this:
function week_number($n)
{
$w = date('w', $n);
return 1 + date('z', $n + (6 - $w) * 24 * 3600) / 7;
}
$n = strtotime('2022-12-27');
printf("%s: %d\n", date('D Y-m-d', $n), week_number($n));
and get:
Tue 2022-12-27: 53
for get week number in jalai calendar you can use this:
$weeknumber = date("W"); //number week in year
$dayweek = date("w"); //number day in week
if ($dayweek == "6")
{
$weeknumberint = (int)$weeknumber;
$date2int++;
$weeknumber = (string)$date2int;
}
echo $date2;
result:
15
week number change in saturday
The most of the above given examples create a problem when a year has 53 weeks (like 2020). So every fourth year you will experience a week difference. This code does not:
$thisYear = "2020";
$thisDate = "2020-04-24"; //or any other custom date
$weeknr = date("W", strtotime($thisDate)); //when you want the weeknumber of a specific week, or just enter the weeknumber yourself
$tempDatum = new DateTime();
$tempDatum->setISODate($thisYear, $weeknr);
$tempDatum_start = $tempDatum->format('Y-m-d');
$tempDatum->setISODate($thisYear, $weeknr, 7);
$tempDatum_end = $tempDatum->format('Y-m-d');
echo $tempDatum_start //will output the date of monday
echo $tempDatum_end // will output the date of sunday
Very simple
Just one line:
<?php $date=date("W"); echo "Week " . $date; ?>"
You can also, for example like I needed for a graph, subtract to get the previous week like:
<?php $date=date("W"); echo "Week " . ($date - 1); ?>
Your code will work but you need to flip the 4th and the 5th argument.
I would do it this way
$date_string = "2012-10-18";
$date_int = strtotime($date_string);
$date_date = date($date_int);
$week_number = date('W', $date_date);
echo "Weeknumber: {$week_number}.";
Also, your variable names will be confusing to you after a week of not looking at that code, you should consider reading http://net.tutsplus.com/tutorials/php/why-youre-a-bad-php-programmer/
The rule is that the first week of a year is the week that contains the first Thursday of the year.
I personally use Zend_Date for this kind of calculation and to get the week for today is this simple. They have a lot of other useful functions if you work with dates.
$now = Zend_Date::now();
$week = $now->get(Zend_Date::WEEK);
// 10
To get Correct Week Count for Date 2018-12-31 Please use below Code
$day_count = date('N',strtotime('2018-12-31'));
$week_count = date('W',strtotime('2018-12-31'));
if($week_count=='01' && date('m',strtotime('2018-12-31'))==12){
$yr_count = date('y',strtotime('2018-12-31')) + 1;
}else{
$yr_count = date('y',strtotime('2018-12-31'));
}
function last_monday($date)
{
if (!is_numeric($date))
$date = strtotime($date);
if (date('w', $date) == 1)
return $date;
else
return date('Y-m-d',strtotime('last monday',$date));
}
$date = '2021-01-04'; //Enter custom date
$year = date('Y',strtotime($date));
$date1 = new DateTime($date);
$ldate = last_monday($year."-01-01");
$date2 = new DateTime($ldate);
$diff = $date2->diff($date1)->format("%a");
$diff = $diff/7;
$week = intval($diff) + 1;
echo $week;
//Returns 2.
try this solution
date( 'W', strtotime( "2017-01-01 + 1 day" ) );
I know about the unwanted behaviour of PHP's function
strtotime
For example, when adding a month (+1 month) to dates like: 31.01.2011 -> 03.03.2011
I know it's not officially a PHP bug, and that this solution has some arguments behind it, but at least for me, this behavior has caused a lot waste of time (in the past and present) and I personally hate it.
What I found even stranger is that for example in:
MySQL: DATE_ADD('2011-01-31', INTERVAL 1 MONTH) returns 2011-02-28
or
C# where new DateTime(2011, 01, 31).AddMonths(1); will return 28.02.2011
wolframalpha.com giving 31.01.2013 + 1 month as input; will return Thursday, February 28, 2013
It sees to me that others have found a more decent solution to the stupid question that I saw alot in PHP bug reports "what day will it be, if I say we meet in a month from now" or something like that. The answer is: if 31 does not exists in next month, get me the last day of that month, but please stick to next month.
So MY QUESTION IS: is there a PHP function (written by somebody) that resolves this not officially recognized bug? As I don't think I am the only one who wants another behavior when adding / subtracting months.
I am particulary interested in solutions what also work not just for the end of the month, but a complete replacement of strtotime. Also the case strotime +n months should be also dealt with.
Happy coding!
what you need is to tell PHP to be smarter
$the_date = strtotime('31.01.2011');
echo date('r', strtotime('last day of next month', $the_date));
$the_date = strtotime('31.03.2011');
echo date('r', strtotime('last day of next month', $the_date));
assuming you are only interesting on the last day of next month
reference - http://www.php.net/manual/en/datetime.formats.relative.php
PHP devs surely don't consider this as bug. But in strtotime's docs there are few comments with solutions for your problem (look for 28th Feb examples ;)), i.e. this one extending DateTime class:
<?php
// this will give us 2010-02-28 ()
echo PHPDateTime::DateNextMonth(strftime('%F', strtotime("2010-01-31 00:00:00")), 31);
?>
Class PHPDateTime:
<?php
/**
* IA FrameWork
* #package: Classes & Object Oriented Programming
* #subpackage: Date & Time Manipulation
* #author: ItsAsh <ash at itsash dot co dot uk>
*/
final class PHPDateTime extends DateTime {
// Public Methods
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Calculate time difference between two dates
* ...
*/
public static function TimeDifference($date1, $date2)
$date1 = is_int($date1) ? $date1 : strtotime($date1);
$date2 = is_int($date2) ? $date2 : strtotime($date2);
if (($date1 !== false) && ($date2 !== false)) {
if ($date2 >= $date1) {
$diff = ($date2 - $date1);
if ($days = intval((floor($diff / 86400))))
$diff %= 86400;
if ($hours = intval((floor($diff / 3600))))
$diff %= 3600;
if ($minutes = intval((floor($diff / 60))))
$diff %= 60;
return array($days, $hours, $minutes, intval($diff));
}
}
return false;
}
/**
* Formatted time difference between two dates
*
* ...
*/
public static function StringTimeDifference($date1, $date2) {
$i = array();
list($d, $h, $m, $s) = (array) self::TimeDifference($date1, $date2);
if ($d > 0)
$i[] = sprintf('%d Days', $d);
if ($h > 0)
$i[] = sprintf('%d Hours', $h);
if (($d == 0) && ($m > 0))
$i[] = sprintf('%d Minutes', $m);
if (($h == 0) && ($s > 0))
$i[] = sprintf('%d Seconds', $s);
return count($i) ? implode(' ', $i) : 'Just Now';
}
/**
* Calculate the date next month
*
* ...
*/
public static function DateNextMonth($now, $date = 0) {
$mdate = array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
list($y, $m, $d) = explode('-', (is_int($now) ? strftime('%F', $now) : $now));
if ($date)
$d = $date;
if (++$m == 2)
$d = (($y % 4) === 0) ? (($d <= 29) ? $d : 29) : (($d <= 28) ? $d : 28);
else
$d = ($d <= $mdate[$m]) ? $d : $mdate[$m];
return strftime('%F', mktime(0, 0, 0, $m, $d, $y));
}
}
?>
Here's the algorithm you can use. It should be simple enough to implement yourself.
Have the original date and the +1 month date in variables
Extract the month part of both variables
If the difference is greater than 1 month (or if the original is December and the other is not January) change the latter variable to the last day of the next month. You can use for example t in date() to get the last day: date( 't.m.Y' )
Had the same issue recently and ended up writing a class that handles adding/subtracting various time intervals to DateTime objects.
Here's the code:
https://gist.github.com/pavlepredic/6220041#file-gistfile1-php
I've been using this class for a while and it seems to work fine, but I'm really interested in some peer review. What you do is create a TimeInterval object (in your case, you would specify 1 month as the interval) and then call addToDate() method, making sure you set $preventMonthOverflow argument to true. The code will make sure that the resulting date does not overflow into next month.
Sample usage:
$int = new TimeInterval(1, TimeInterval::MONTH);
$date = date_create('2013-01-31');
$future = $int->addToDate($date, true);
echo $future->format('Y-m-d');
Resulting date is:
2013-02-28
Here is an implementation of an improved version of Juhana's answer above:
<?php
function sameDateNextMonth(DateTime $createdDate, DateTime $currentDate) {
$addMon = clone $currentDate;
$addMon->add(new DateInterval("P1M"));
$nextMon = clone $currentDate;
$nextMon->modify("last day of next month");
if ($addMon->format("n") == $nextMon->format("n")) {
$recurDay = $createdDate->format("j");
$daysInMon = $addMon->format("t");
$currentDay = $currentDate->format("j");
if ($recurDay > $currentDay && $recurDay <= $daysInMon) {
$addMon->setDate($addMon->format("Y"), $addMon->format("n"), $recurDay);
}
return $addMon;
} else {
return $nextMon;
}
}
This version takes $createdDate under the presumption that you are dealing with a recurring monthly period, such as a subscription, that started on a specific date, such as the 31st. It always takes $createdDate so late "recurs on" dates won't shift to lower values as they are pushed forward thru lesser-valued months (e.g., so all 29th, 30th or 31st recur dates won't eventually get stuck on the 28th after passing thru a non-leap-year February).
Here is some driver code to test the algorithm:
$createdDate = new DateTime("2015-03-31");
echo "created date = " . $createdDate->format("Y-m-d") . PHP_EOL;
$next = sameDateNextMonth($createdDate, $createdDate);
echo " next date = " . $next->format("Y-m-d") . PHP_EOL;
foreach(range(1, 12) as $i) {
$next = sameDateNextMonth($createdDate, $next);
echo " next date = " . $next->format("Y-m-d") . PHP_EOL;
}
Which outputs:
created date = 2015-03-31
next date = 2015-04-30
next date = 2015-05-31
next date = 2015-06-30
next date = 2015-07-31
next date = 2015-08-31
next date = 2015-09-30
next date = 2015-10-31
next date = 2015-11-30
next date = 2015-12-31
next date = 2016-01-31
next date = 2016-02-29
next date = 2016-03-31
next date = 2016-04-30
I have solved it by this way:
$startDate = date("Y-m-d");
$month = date("m",strtotime($startDate));
$nextmonth = date("m",strtotime("$startDate +1 month"));
if((($nextmonth-$month) > 1) || ($month == 12 && $nextmonth != 1))
{
$nextDate = date( 't.m.Y',strtotime("$initialDate +1 week"));
}else
{
$nextDate = date("Y-m-d",strtotime("$initialDate +1 month"));
}
echo $nextDate;
Somewhat similar to the Juhana's answer but more intuitive and less complications expected. Idea is like this:
Store original date and the +n month(s) date in variables
Extract the day part of both variables
If days do not match, subtract number of days from the future date
Plus side of this solution is that works for any date (not just the border dates) and it also works for subtracting months (by putting - instead of +).
Here is an example implementation:
$start = mktime(0,0,0,1,31,2015);
for ($contract = 0; $contract < 12; $contract++) {
$end = strtotime('+ ' . $contract . ' months', $start);
if (date('d', $start) != date('d', $end)) {
$end = strtotime('- ' . date('d', $end) . ' days', $end);
}
echo date('d-m-Y', $end) . '|';
}
And the output is following:
31-01-2015|28-02-2015|31-03-2015|30-04-2015|31-05-2015|30-06-2015|31-07-2015|31-08-2015|30-09-2015|31-10-2015|30-11-2015|31-12-2015|
function ldom($m,$y){
//return tha last date of a given month based on the month and the year
//(factors in leap years)
$first_day= strtotime (date($m.'/1/'.$y));
$next_month = date('m',strtotime ( '+32 day' , $first_day)) ;
$last_day= strtotime ( '-1 day' , strtotime (date($next_month.'/1/'.$y)) ) ;
return $last_day;
}