Now all modules are in core modules folder

modules/password_policy/constraints/constraint_delay.inc

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * @file
+ * Password policy constraint callback to set a minimum delay between password
+ * changes.
+ *
+ * @link http://drupal.org/node/316765
+ * @author David Kent Norman (http://deekayen.net/)
+ */
+
+/****************************************************************************/
+/* Constraint API                                                           */
+/****************************************************************************/
+
+/**
+ * Description of the constraint.
+ */
+function password_policy_constraint_delay_description() {
+  return array('name' => t('Delay'), 'description' => t('Minimum number of hours between password changes.'));
+}
+
+/**
+ * Error message of the constraint.
+ */
+function password_policy_constraint_delay_error($constraint) {
+  return format_plural($constraint, 'Password may only be changed in an hour from the last change.', 'Password may only be changed in @count hours from the last change.');
+}
+
+/**
+ * Password validation.
+ */
+function password_policy_constraint_delay_validate($password, $constraint, $uid) {
+  $account = user_load($uid);
+  // bypass delay constraint, if account is marked "Force password change on
+  // next login."
+  if ($account->force_password_change) {
+    return TRUE;
+  }
+
+  $last_change = db_result(db_query_range("SELECT MAX(created) FROM {password_policy_history} WHERE uid = %d", $uid, 0, 1));
+  if (!empty($last_change)) {
+    // Constraint is set in hours, so it gets converted to seconds with *60*60.
+    return time() - ($constraint*60*60) > $last_change;
+  }
+  return TRUE;
+}
+
+function password_policy_constraint_delay_js() {
+  return '';
+}