ROSH HASHANAH 2014
2014: September 24 (at sundown) - 26
2015: September 13 (at sundown) - 15
2016: October 2 (at sundown) - 4
2017: September 20 (at sundown) - 22
Note: The Jewish calendar date begins at sundown of the night beforehand. Thus all holiday observances begin at sundown on the secular dates listed, with the following day being the first full day of the holiday. Jewish calendar dates conclude at nightfall.
Source: chabad.org, aish.com