diff --git a/inc/defines.php b/inc/defines.php
index ee8a04c..8b9a9a9 100644
--- a/inc/defines.php
+++ b/inc/defines.php
@@ -52,6 +52,9 @@ if (!defined('TINYIB_CATALOG')) {
 if (!defined('TINYIB_JSON')) {
 	define('TINYIB_JSON', true);
 }
+if (!defined('TINYIB_DATEFMT')) {
+	define('TINYIB_DATEFMT', 'y/m/d(D)H:i:s');
+}
 if (!defined('TINYIB_DBMIGRATE')) {
 	define('TINYIB_DBMIGRATE', false);
 }
diff --git a/inc/functions.php b/inc/functions.php
index 86f6d5a..6844a23 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -223,7 +223,7 @@ function nameBlock($name, $tripcode, $email, $timestamp, $rawposttext) {
 		$output = '<a href="mailto:' . $email . '">' . $output . '</a>';
 	}
 
-	return $output . $rawposttext . ' ' . date('y/m/d(D)H:i:s', $timestamp);
+	return $output . $rawposttext . ' ' . date(TINYIB_DATEFMT, $timestamp);
 }
 
 function writePage($filename, $contents) {
@@ -331,7 +331,7 @@ function checkBanned() {
 	$ban = banByIP($_SERVER['REMOTE_ADDR']);
 	if ($ban) {
 		if ($ban['expire'] == 0 || $ban['expire'] > time()) {
-			$expire = ($ban['expire'] > 0) ? ('<br>This ban will expire ' . date('y/m/d(D)H:i:s', $ban['expire'])) : '<br>This ban is permanent and will not expire.';
+			$expire = ($ban['expire'] > 0) ? ('<br>This ban will expire ' . date(TINYIB_DATEFMT, $ban['expire'])) : '<br>This ban is permanent and will not expire.';
 			$reason = ($ban['reason'] == '') ? '' : ('<br>Reason: ' . $ban['reason']);
 			fancyDie('Your IP address ' . $ban['ip'] . ' has been banned from posting on this image board.  ' . $expire . $reason);
 		} else {
diff --git a/inc/html.php b/inc/html.php
index 0e5bb3a..2f509ef 100644
--- a/inc/html.php
+++ b/inc/html.php
@@ -791,9 +791,9 @@ function manageBansTable() {
 	if (count($allbans) > 0) {
 		$text .= '<table border="1"><tr><th>' . __('IP Address') . '</th><th>' . __('Set At') . '</th><th>' . __('Expires') . '</th><th>' . __('Reason') . '</th><th>&nbsp;</th></tr>';
 		foreach ($allbans as $ban) {
-			$expire = ($ban['expire'] > 0) ? date('y/m/d(D)H:i:s', $ban['expire']) : __('Does not expire');
+			$expire = ($ban['expire'] > 0) ? date(TINYIB_DATEFMT, $ban['expire']) : __('Does not expire');
 			$reason = ($ban['reason'] == '') ? '&nbsp;' : htmlentities($ban['reason']);
-			$text .= '<tr><td>' . $ban['ip'] . '</td><td>' . date('y/m/d(D)H:i:s', $ban['timestamp']) . '</td><td>' . $expire . '</td><td>' . $reason . '</td><td><a href="?manage&bans&lift=' . $ban['id'] . '">' . __('lift') . '</a></td></tr>';
+			$text .= '<tr><td>' . $ban['ip'] . '</td><td>' . date(TINYIB_DATEFMT, $ban['timestamp']) . '</td><td>' . $expire . '</td><td>' . $reason . '</td><td><a href="?manage&bans&lift=' . $ban['id'] . '">' . __('lift') . '</a></td></tr>';
 		}
 		$text .= '</table>';
 	}
diff --git a/settings.default.php b/settings.default.php
index ed31869..0d4d582 100644
--- a/settings.default.php
+++ b/settings.default.php
@@ -35,6 +35,7 @@ define('TINYIB_WORDBREAK', 80);       // Words longer than this many characters
 define('TINYIB_TIMEZONE', 'UTC');     // See https://secure.php.net/manual/en/timezones.php - e.g. America/Los_Angeles
 define('TINYIB_CATALOG', true);       // Generate catalog page
 define('TINYIB_JSON', true);          // Generate JSON files
+define('TINYIB_DATEFMT', 'y/m/d(D)H:i:s'); // Date format  (see php.net/date)
 $tinyib_hidefieldsop = array();       // Fields to hide when creating a new thread - e.g. array('name', 'email', 'subject', 'message', 'file', 'embed', 'password')
 $tinyib_hidefields = array();         // Fields to hide when replying
 $tinyib_capcodes = array(array('Admin', 'red'), array('Mod', 'purple')); // Administrator and moderator capcode label and color