The following are calculations from time and date.com. There are 2520 days from 10-17 (Tishri 19) in 2011 to 9-10-2018 on The Feast of Trumpets. There are 2520 days from 10-26-2011 (Tishri 26 -New Moon conjunction for Cheshvan) until 9-19-2018 on Yom Kippur. Yom Kippur in 2011 will be 10-8 to 9 and Tishri 11 will 10-9 to 10. Tabernacles days 1-7 will be 10-12 to 19, 2011. The Last Great Day, Shemini Atzeret will be 10-19 to 20, 2011. Simchat Torah (Rejoicing in the Torah) is an additional day not commanded in the Torah from 10-20 to 21, 2011.
As you can see, there are no longer 2550 days to count from now to The Feast of Trumpets or Yom Kippur in 2018, according to the Hillel Calendar. May we be WATCHING!
With Love and Shalom,