Office Hours & Holiday Schedule Monday - Friday; 8:00 am (0800) - 5:00 pm (1700) EST/EDT (1300-2200 GMT/UTC)   OGT is closed for business on the following days in 2010:   Date Holiday Day       January 1st New Year's Day Friday       April 2nd Good Friday Friday       May 31st Memorial Day (Observed) Monday       July 5th Independence Day (Observed) Monday       September 6th Labor Day Monday       November 25th Thanksgiving Day Thursday       November 26th Second Day of Thanksgiving Friday       December 24th Christmas Eve Friday       December 31st New Year's Eve Friday         Please contact us on the next business day for service or support.