An anonymous reader writes "The 15000th day of Unix epoch time starts tonight at midnight GMT. More information about parties including a countdown clock are available at the official website for the event here and includes a countdown clock. A large main party is happening tonight at 7pm EST in Bloomington, Indiana to mark the occasion. The last 5000 day mark of epoch days happened a few months before Slashdot existed, so this will be the first time Slashdotters will be able to celebrate such an occasion. The next time won't be until 2024. And also unlike the last time, this time Mac users can join in the fun. Its also a great day to change your password."