diff --git a/core/database.class.php b/core/database.class.php
index 3b7b3ed1..2880684b 100644
--- a/core/database.class.php
+++ b/core/database.class.php
@@ -72,6 +72,7 @@ class MySQL extends DBEngine {
 		$data = str_replace("SCORE_BOOL_Y", "'Y'", $data);
 		$data = str_replace("SCORE_BOOL_N", "'N'", $data);
 		$data = str_replace("SCORE_BOOL", "ENUM('Y', 'N')", $data);
+		$data = str_replace("SCORE_DATETIME", "DATETIME", $data);
 		$data = str_replace("SCORE_NOW", "\"1970-01-01\"", $data);
 		$ctes = "TYPE=InnoDB DEFAULT CHARSET='utf8'";
 		return "CREATE TABLE $name ($data) $ctes";
@@ -86,6 +87,7 @@ class PostgreSQL extends DBEngine {
 		$data = str_replace("SCORE_BOOL_Y", "'t'", $data);
 		$data = str_replace("SCORE_BOOL_N", "'f'", $data);
 		$data = str_replace("SCORE_BOOL", "BOOL", $data);
+		$data = str_replace("SCORE_DATETIME", "TIMESTAMP", $data);
 		$data = str_replace("SCORE_NOW", "current_time", $data);
 		return "CREATE TABLE $name ($data)";
 	}
diff --git a/install.php b/install.php
index d87d8a1b..bb869e5a 100644
--- a/install.php
+++ b/install.php
@@ -197,7 +197,7 @@ function create_tables($dsn) { // {{{
 			id SCORE_AIPK,
 			name VARCHAR(32) UNIQUE NOT NULL,
 			pass CHAR(32),
-			joindate DATETIME NOT NULL DEFAULT SCORE_NOW,
+			joindate SCORE_DATETIME NOT NULL DEFAULT SCORE_NOW,
 			admin SCORE_BOOL NOT NULL DEFAULT SCORE_BOOL_N,
 			email VARCHAR(128)
 		"));
@@ -212,7 +212,7 @@ function create_tables($dsn) { // {{{
 			source VARCHAR(255),
 			width INTEGER NOT NULL,
 			height INTEGER NOT NULL,
-			posted TIMESTAMP NOT NULL DEFAULT SCORE_NOW,
+			posted SCORE_DATETIME NOT NULL DEFAULT SCORE_NOW,
 			locked SCORE_BOOL NOT NULL DEFAULT SCORE_BOOL_N,
 			INDEX(owner_id),
 			INDEX(width),