PHP: Unix Time Methods

time.php

<?php
 print time();
//1324402770
 $unixTime = time();
 print_r(getdate($unixTime));
// Array
// (
//    [seconds] => 48
//    [minutes] => 54
//    [hours] => 12
//    [mday] => 20
//    [wday] => 2
//    [mon] => 12
//    [year] => 2011
//    [yday] => 353
//    [weekday] => Tuesday
//    [month] => December
//    [0] => 1324403688
// )

//Formatting a Unix Time

 print date("r", $unixTime);
//Tue, 20 Dec 2011 12:54:48 -0500
 print date("m/d/y h:i:s a", $unixTime);
//12/20/11 12:54:48 pm
 print date("m/d/y h:i:s a");
//12/20/11 01:12:11 pm
 print date("jS \of F Y", $unixTime);
//20th of December 2011
 print date("r", mktime(12, 0, 0, 1, 20, 1987));
//Tue, 20 Jan 1987 12:00:00 -0500
 print date("r", mktime(0, 0, 0, date("n"), date("j"), date("Y")));
//Tue, 20 Dec 2011 00:00:00 -0500
 print date("r", mktime(23, 59, 59, date("n"), date("j"), date("Y")));
//Tue, 20 Dec 2011 23:59:59 -0500
 print strtotime("now");
//1324407707

//Parsing an English Date to Unix Time

 print date("r", strtotime("now"));
//Tue, 20 Dec 2011 14:01:51 -0500
 print strtotime("+1 week");
//1325012569
 print date("r", strtotime("+1 week"));
//Tue, 27 Dec 2011 14:03:03 -0500
 print date("r", strtotime("next month"));
//Fri, 20 Jan 2012 14:04:20 -0500
 print date("r", strtotime("next month", mktime(0, 0, 0)));
//Fri, 20 Jan 2012 00:00:00 -0500
 print date("r", strtotime("next month", mktime(0, 0, 0, 1, 31)));
//Thu, 03 Mar 2011 00:00:00 -0500

//PHP’s DateTime and DateTimeZone Objects

 $dt = new DateTime("now"); 
 print $dt->format("r");
//Tue, 20 Dec 2011 16:28:32 -0500
 $dt = new DateTime("December 31 1999 12:12:12 EST");
 print $dt->format("r");
//Fri, 31 Dec 1999 12:12:12 -0500
 print $dt->format(DATE_ATOM);
//2011-12-20T15:57:45-05:00
 print $dt->format(DATE_ISO8601);
//2011-12-20T15:57:45-0500
 print $dt->format(DATE_RFC822);
//Tue, 20 Dec 11 15:57:45 -0500
 print $dt->format(DATE_RSS);
//Tue, 20 Dec 2011 15:57:45 -0500
 print date_default_timezone_get();
//America/New_York
 $dt = new DateTime();
 print $dt->getTimeZone()->getName();
//UTC
 $dt = new DateTime();
 print $dt->format("r");
//Tue, 20 Dec 2011 20:57:45 +0000
 $tz = new DateTimeZone("America/New_York");
 $dt->setTimezone($tz);
 print $dt->gt;format("r");
//Tue, 20 Dec 2011 15:57:45 -0500
 $tz = new DateTimeZone("America/New_York");
 $july = new DateTime("7/1/2011");
 $july->setTimezone($tz);
 print $july->>format("r");
//Thu, 30 Jun 2011 20:00:00 -0400

$result = $db->query("SELECT int_date FROM some_table");
while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
    $dt = new DateTime();
    $tz = new DateTimeZone($_SESSION["userTZ"]);
    $dt->setTimestamp($row["int_date"]);
    $dt->setTimezone($tz);
    print $dt->format("r");
}