php date iso

$today = date("F j, Y, g:i a"); // March 10, 2001, 5:16 pm $today = date("m.d.y"); // 03.10.01 $today = date("j, n, Y"); // 10, 3, 2001 $today = date("Ymd"); // 20010310 $today = date('h-i-s, j-m-y, it is w Day'); // 05-16-18, 10-03-01, 1631 1618 6 Satpm01 $today = date('\i\t \i\s \t\h\e jS \d\a\y.'); // It is the 10th day (10ème jour du mois). $today = date("D M j G:i:s T Y"); // Sat Mar 10 17:16:18 MST 2001 $today = date('H:m:s \m \e\s\t\ \l\e\ \m\o\i\s'); // 17:03:18 m est le mois $today = date("H:i:s"); // 17:16:18 $today = date("Y-m-d H:i:s"); // 2001-03-10 17:16:18 (le format DATETIME de MySQL)

php week of a date

Things to be aware of when using week numbers with years.

<?php
echo date("YW", strtotime("2011-01-07")); // gives 201101
echo date("YW", strtotime("2011-12-31")); // gives 201152
echo date("YW", strtotime("2011-01-01")); // gives 201152 too
?>

BUT

<?php
echo date("oW", strtotime("2011-01-07")); // gives 201101
echo date("oW", strtotime("2011-12-31")); // gives 201152
echo date("oW", strtotime("2011-01-01")); // gives 201052 (Year is different than previous example)
?>

Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year

Conclusion:
if using 'W' for the week number use 'o' for the year.

Posted by: Guest on March-28-2020

Source

FYI: there's a list of constants with predefined formats on the DateTime object, for example instead of outputting ISO 8601 dates with: <?php echo date('c'); ?> or <?php echo date('Y-m-d\TH:i:sO'); ?> You can use <?php echo date(DateTime::ISO8601); ?> instead, which is much easier to read.

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