Giving a starting date, I'm adding four times seven days to get 5 different dates separated exactly a week each one.
//$date = '28-10-2010';
$timestamp = mktime( 0, 0, 0, 10, 01, 2010 );
echo "Date=".date( 'd-m-Y', $timestamp )."<br>";
$timestamp += (60*60*24*7);
echo "Date=".date( 'd-m-Y', $timestamp )."<br>";
$timestamp += (60*60*24*7);
echo "Date=".date( 'd-m-Y', $timestamp )."<br>";
$timestamp += (60*60*24*7);
echo "Date=".date( 'd-m-Y', $timestamp )."<br>";
$timestamp += (60*60*24*7);
echo "Date=".date( 'd-m-Y', $timestamp )."<br>";
The code outputs this:
Date=01-10-2010 Friday
Date=08-10-2010 Friday
Date=15-10-2010 Friday
Date=22-10-2010 Friday
Date=29-10-2010 Friday
Which as long as I know it's correct. But, see what happens when going through the 2010-10-31 and 2010-11-01
$timestamp = mktime( 0, 0, 0, 10, 28, 2010 ); [...]
Curiously it outputs this:
Date=28-10-2010 Thursday
Date=03-11-2010 Wednesday
Date=10-11-2010 Wednesday
Date=17-11-2010 Wednesday
Date=24-11-2010 Wednesday
What's happening? Second date should be 04-11-2010! Also, I saw that this "fail" happens every ten years! Is this something related with the daylight savings time? If so, how do I solve it? Is there anything that i am overlooking?
Edit: Ok, I outputed the time, just to see what happens and this is what I got now:
Date=28-10-2010 Thursday :: 00:00:00
Date=03-11-2010 Wednesday :: 23:00:00
Date=10-11-2010 Wednesday :: 23:00:00
Date=17-11-2010 Wednesday :: 23:00:00
Date=24-11-2010 Wednesday :: 23:00:00
Seems something related with the time, something happens at 2010-11-31...