What year was 2017 on the Jewish calendar?

The year 2017 on the Gregorian calendar corresponds to the years 5777 and 5778 on the Jewish calendar. The Jewish calendar is a lunisolar calendar, meaning it is based on both the moon’s phases and the solar year. The year 5777 began at sundown on October 2, 2016, and ended on September 20, 2017. Following it, 5778 began at sundown on September 20, 2017, and continued until the Jewish New Year in 2018.