// int idate(string $format [, int $timestamp]);
$timestamp = strtotime('23st March 2016');
echo 'y - ' . idate('y', $timestamp) . "<br />"; // Year (1 or 2 digits)
echo 'Y - ' . idate('Y', $timestamp) . "<br />"; // Year (4 digits)
echo 'd - ' . idate('d', $timestamp) . "<br />"; // Day of the month
echo 'h - ' . idate('h', $timestamp) . "<br />"; // Hour (12 hour format)
echo 'i - ' . idate('i', $timestamp) . "<br />"; // Minutes
echo 't - ' . idate('t', $timestamp) . "<br />"; // Days in current month
echo 'w - ' . idate('w', $timestamp) . "<br />"; // Day of the week (Sunday = 0)
echo 'z - ' . idate('z', $timestamp) . "<br />"; // Day of the year
/*
run:
y - 16
Y - 2016
d - 23
h - 12
i - 0
t - 31
w - 3
z - 82
*/