Tier Level Expiration question

I understand that the tier level (diamond, platinum) earned in one calendar year with CET is good until March of the following year, but does it expire March 1st or March 31st?

Thanks, cannot find a definitive answer on TR site but perhaps I'm not looking hard enough!

31st

I made a quick trip to LV at the end of February this year so I could have one more time as a Diamond. Once there, I found out it ends the 31st of March, not the 1st.

Thanks so much for the responses. Have a trip booked for the first week in March and it doesn't appear I will retain my current level with the changes coming....it was fun while it lasted!

I've gotten different answers to the following:

If I earn DIAD in December 2012 (this month) , will it be good until March 2013, or March 2014?

Which is the correct answer?

2014

tier levels are based on the "calender year" points earned?

Agree with Vetsen, your diamond status would expire 2014

Anybody else missing their tier points today? Always sad when it goes back to zero! Happy New Year everybody!!

Agree with eholmes. I checked my tier level today and it was back to "0".
Starting all over again. Still haven't seen anything about the tier level increases.