You will want to get approval before you do this, but if you can, June 2 is National Leave the Office Early Day.
While it's not an official national holiday, the idea is to bring attention a growing national trend to work longer hours.
Laura Stack, who coined the day, is a corporate consultant who cites a growing pile of evidence and statistics that show Americans are working longer, but not harder.
She says that if everyone worked more efficiently -- like most do leading up to a vacation -- they would be able to leave work on time and have more free time every week.
National Leave the Office Early Day is meant to promote the 40-hour work week, which is becoming more rare.
The Bureau of Labor Statistics reports the average American works 49 hours.
Just check with your boss before you head home, or you might have more free time than you need.