Miles & More status miles are earned on calendar year basis — from January 1 to December 31 of each year. (meinemeilen.com)
To achieve or retain Hilton Honors Diamond status, you need to earn either: (1) 30 stays in a calendar year, or (2) 60 nights in a calendar year, or (3) 120,000 Hilton Honors Base Points in a calendar year (hiltonhonors3.hilton.com)
The deadline for calendar year based C - Corporations will be pushed from March 15 to April 15. (entrepreneur.com)