Whenever I'm asked if the Jewish holidays are coming early or late this year, I promptly answer that they'll be coming on time. And that's partially true. Rosh Hashanah will always arrive on the first day of the Jewish month of Tishrei just as Hanukkah will always begin on the 25th of Kislev.
I was proud to have been at a Rosh Chodesh service yesterday morning in Chicago, IL. I was proud to have been asked to help lead the service, proud to don my tallit and stand before a congregation of people who had come together to pray, celebrate, and sing.
Given that Yom Kippur is the holiest day on the Jewish calendar, it makes sense that it can, and should, be joyful.