check date in php not working with different month - php

Question

here i am checking the date with current date to previous date it show the proper message when the subtracted date's result is current date .but when the subtracted result is previous date like 02-12-2014 - 4 days it gives 28-11-2014 .and condition of (02-12-2014>=28-11-2014) it gives false.why it cant check the diff of diff month's date. even it true the condition when date like (04-12-2014>=06-12-2014).
<div class="box-content">
<div class="maq_cont">
<marquee direction="up" scrollamount="3" onMouseOut="this.setAttribute('scrollamount',3,0)" onMouseOver="this.setAttribute('scrollamount', 0, 0)" style="height:200px; margin-top:-10px; margin-bottom:-10px;">
<ul class="maq_li">
<?php
echo $work_date = "03-12-2014";
echo "<br>";
echo $day = "3";
echo "<br>";
echo $show_date = date( "d-m-Y", strtotime( "$work_date -$day day" ));
echo "<br>";
echo $cur_date= date( "d-m-Y" );
if ($cur_date >= $show_date) {
echo '<li>done</li>';
} else {
echo '<li>not done</li>';
}
?>
</ul>
</marquee>
</div>
</div>

Answer 1

Try with -
if(strtotime($cur_date)>=strtotime($show_date)){
It is happening because they are strings.

Answer 2

You have to put the year at the beginning of your date string, then month and then the day. The reason is: You aren't comparing dates, you compare string. And they will be compared alphabetically.
e.g. the string date '01.01.2015' is alphabetically smaller than '02.01.2013', but this format ('Ymd') does the trick in this special order: '20150101' is alphabetically and also numerically greater than '20130102'.
// this formatting will work
$show_date = date('Ymd', strtotime("$work_date -$day day"));
$cur_date = date('Ymd');
I would prefer to do this comparison with date and the awesome DateTime object. Do it like this:
if (new DateTime('NOW')
>= DateTime::createFromFormat('d-m-Y', $show_date))
{
echo '<li>done</li>';
} else {
echo '<li>not done</li>';
}
The DateTime::createFromFormat() call returns a DateTime object. The first parameter $format has the same syntax like your format string you are using with date(). The second parameter is the so formatted date string to parse. Read more:
http://php.net/manual/en/datetime.createfromformat.php
After getting this DateTime object you can do some magic like
$date = DateTime::createFromFormat('d-m-Y', $show_date);
$date->modify('+1 days'); // one day later
And to output the date as string use the format()function:
$date->format('Y'); // the year
$date->format('m'); // the month
$date->format('d'); // the day
$date->format('Y-m-d H:i:s'); // e.g. 2014-12-05 23:11:00
$date->format('U'); // as timestamp: 1417817460
// [...]
More Information:
http://php.net/manual/en/datetime.format.php
http://php.net/manual/en/datetime.modify.php
http://php.net/manual/en/function.date.php