刚刚申请了15晚挑战，回复的邮件如下，其中没有涉及任何expire date for Platinum，但是以前的帖子上附录的回复邮件是明确写道2013年的，难道SPG的政策不一致吗？|
Thank you for your interest in our Starwood Preferred Guest (SPG) Platinum membership level. We are pleased to offer you an opportunity to reach that level sooner through our Platinum level challenge.
We will upgrade you to our Platinum level if you stay 15 eligible nights between July 4, 2011 and October 4, 2011. This offer is not retroactive.
An eligible night is defined as one or more nights paying a qualifying rate at a participating hotel that posts to a member's Starwood Preferred Guest® account. A description of qualifying rates can be found at SPG.com/t&c under section 4B.4.
If you have 15 eligible nights posted to your account prior end of your stay challenge, please email us at firstname.lastname@example.org, and we will be more than happy to review your account at that time. If you do not contact us, you will be contacted by a member of our liaison team at the end of the status challenge.
All promotions are subject to the Starwood Preferred Guest program terms and conditions, which are subject to change without notice and can be found at SPG.com. Offer is applicable to an individual member only and is not available to groups or Starwood employees. Not responsible for omissions or typographical errors. Starwood reserves the right to discontinue this offer at any time. To update your communication preferences or learn about our privacy practices, view our Privacy Statement on SPG, Preferred Guest, Sheraton, Four Points, W, Aloft, The Luxury Collection, Le Méridien, Element, Westin, St. Regis and their respective logos are the trademarks of Starwood Hotels & Resorts Worldwide, Inc., or its affiliates. Void where prohibited by law. © 2011 Starwood Hotels & Resorts Worldwide, Inc. All rights reserved.