As a reminder, Monday, September 4 is a Federal holiday here in the U.S., so expect market interruption. Labor Day is always observed the first Monday in September.
Here’s the CME (Chicago Mercantile Exchange) schedule for equity products, which includes the E-mini S&P:
• On Friday, Sep. 1, markets will close at the regular time
• On Sunday, Sep. 3, markets will open at the regular time
• On Monday, Sep. 4 (Labor Day), markets will halt (close early) at 1:00 p.m. US/Eastern (New York time, UTC-4)
• On Monday, Sep. 4 (Labor Day), markets will resume at 6:00 p.m. US/Eastern (New York time, UTC-4)
These times also apply to the CME’s interest rate, FX, energy, metal, and DME products. Click here for the official page with trading hours.
According to the U.S. Department of Labor, the purpose of Labor Day is to recognize “…the contributions workers have made to the strength, prosperity, and well-being of our country.”
Here is a full list of 2017 trading holidays.