diff --git a/phpBB/adm/style/acp_users_prefs.html b/phpBB/adm/style/acp_users_prefs.html
index 14715f59e4..61904adc23 100644
--- a/phpBB/adm/style/acp_users_prefs.html
+++ b/phpBB/adm/style/acp_users_prefs.html
@@ -52,7 +52,7 @@
 	<dl> 
 		<dt><label for="dateoptions">{L_BOARD_DATE_FORMAT}{L_COLON}</label><br /><span>{L_BOARD_DATE_FORMAT_EXPLAIN}</span></dt>
 		<dd><select name="dateoptions" id="dateoptions" onchange="if(this.value=='custom'){phpbb.toggleDisplay('custom_date',1);}else{phpbb.toggleDisplay('custom_date',-1);} if (this.value == 'custom') { document.getElementById('dateformat').value = default_dateformat; } else { document.getElementById('dateformat').value = this.value; }">{S_DATEFORMAT_OPTIONS}</select></dd>
-		<dd><div id="custom_date"<!-- IF not S_CUSTOM_DATEFORMAT --> style="display:none;"<!-- ENDIF -->><input type="text" name="dateformat" id="dateformat" value="{DATE_FORMAT}" maxlength="30" /></div></dd>
+		<dd><div id="custom_date"<!-- IF not S_CUSTOM_DATEFORMAT --> style="display:none;"<!-- ENDIF -->><input type="text" name="dateformat" id="dateformat" value="{DATE_FORMAT}" maxlength="64" /></div></dd>
 	</dl>
 	<!-- EVENT acp_users_prefs_personal_append -->
 	</fieldset>
diff --git a/phpBB/includes/acp/acp_users.php b/phpBB/includes/acp/acp_users.php
index 32f5ffdc44..204c838c0f 100644
--- a/phpBB/includes/acp/acp_users.php
+++ b/phpBB/includes/acp/acp_users.php
@@ -1627,7 +1627,7 @@ class acp_users
 				if ($submit)
 				{
 					$error = validate_data($data, array(
-						'dateformat'	=> array('string', false, 1, 30),
+						'dateformat'	=> array('string', false, 1, 64),
 						'lang'			=> array('match', false, '#^[a-z_\-]{2,}$#i'),
 						'tz'			=> array('timezone'),
 
diff --git a/phpBB/includes/ucp/ucp_prefs.php b/phpBB/includes/ucp/ucp_prefs.php
index 4017caa0ca..bf4b5ad2f2 100644
--- a/phpBB/includes/ucp/ucp_prefs.php
+++ b/phpBB/includes/ucp/ucp_prefs.php
@@ -86,7 +86,7 @@ class ucp_prefs
 					}
 
 					$error = array_merge(validate_data($data, array(
-						'dateformat'	=> array('string', false, 1, 30),
+						'dateformat'	=> array('string', false, 1, 64),
 						'lang'			=> array('language_iso_name'),
 						'tz'			=> array('timezone'),
 					)), $error);
diff --git a/phpBB/phpbb/db/migration/data/v31x/increase_size_of_dateformat.php b/phpBB/phpbb/db/migration/data/v31x/increase_size_of_dateformat.php
new file mode 100644
index 0000000000..634e50ff19
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v31x/increase_size_of_dateformat.php
@@ -0,0 +1,35 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\db\migration\data\v31x;
+
+class increase_size_of_dateformat  extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array(
+			'\phpbb\db\migration\data\v31x\v316',
+		);
+	}
+
+	public function update_schema()
+	{
+		return array(
+			'change_columns' => array(
+				$this->table_prefix . 'users' => array(
+					'user_dateformat' => array('VCHAR:64', 'd M Y H:i'),
+				),
+			),
+		);
+	}
+}
diff --git a/phpBB/styles/prosilver/template/ucp_prefs_personal.html b/phpBB/styles/prosilver/template/ucp_prefs_personal.html
index c8b028f83a..4cd9f6655b 100644
--- a/phpBB/styles/prosilver/template/ucp_prefs_personal.html
+++ b/phpBB/styles/prosilver/template/ucp_prefs_personal.html
@@ -70,7 +70,7 @@
 				{S_DATEFORMAT_OPTIONS}
 			</select>
 		</dd>
-		<dd id="custom_date" style="display:none;"><input type="text" name="dateformat" id="dateformat" value="{DATE_FORMAT}" maxlength="30" class="inputbox narrow" style="margin-top: 3px;" /></dd>
+		<dd id="custom_date" style="display:none;"><input type="text" name="dateformat" id="dateformat" value="{DATE_FORMAT}" maxlength="64" class="inputbox narrow" style="margin-top: 3px;" /></dd>
 	</dl>
 	<!-- EVENT ucp_prefs_personal_append -->
 	</fieldset>