Definition: It's a year, 2009, July 29th, 10:09 AM, 29 minutes. Detailed definitions: Year in which: 2009 was a common era, started from the Roman calendar to the Gregorian calendar; 2009 is a leap-year if it's divisible by 400; July 29th was a day of the week for the Julian calendar and August 28th was a day of the week for the Gregorian calendar.