Re: date weirdness
| From: | Robert Cummings | Date: | Tue, 18 Sep 2007 22:45:37 +0000 |
| Subject: | Re: date weirdness | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-262222@lists.php.net to get a copy of this message | ||
On Tue, 2007-09-18 at 15:32 -0500, Greg Donald wrote:
> I have extracted a small portion of a calendar application I developed
> recently to show some strange behavior with the date() function. When I
> run this I get duplicate dates occasionally down the list. I'm seeing
> 11/4 twice for example. Sometimes dates are missing from the list. The
> results change from day to day.
>
> #!/usr/bin/env php
> <?php
>
> error_reporting( E_ALL );
>
> define( 'SECONDS_IN_A_DAY', 60 * 60 * 24 );
> define( 'LAST_SUNDAY', strtotime( 'last Sunday' ) );
>
> echo 'SECONDS_IN_A_DAY = ' . SECONDS_IN_A_DAY . "\n";
> echo 'LAST_SUNDAY = ' . LAST_SUNDAY . "\n";
>
> for( $x = 0; $x < 365; $x++ )
> {
> $seconds = LAST_SUNDAY + ( SECONDS_IN_A_DAY * $x );
> $date = date( 'n/j', $seconds );
> echo "$seconds $date\n";
> }
> ?>
>
> I get the same results with latest PHP4 and PHP5.
Using seconds is a hack that doesn't account for DST. Use the following
instead:
<?php
error_reporting( E_ALL );
define( 'LAST_SUNDAY', strtotime( 'last Sunday' ) );
echo 'LAST_SUNDAY = ' . LAST_SUNDAY . "\n";
for( $x = 0; $x < 365; $x++ )
{
$timestamp = strtotime( "+$x days", LAST_SUNDAY );
$date = date( 'n/j', $timestamp );
echo "$timestamp $date\n";
}
?>
Cheers,
Rob.
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