Ends Sunday at midnight GMT+1
Actually, this leave a potential issue to be settled.
"Sunday at midnight", technically speaking, refers to "Saturday night." The very next minute after Saturday 23:59 is Sunday 00:00. Is this what you meant, or did you mean Sunday night, which technically would be Monday at midnight.
For those who are time-zone challenged in the US and Canada, GMT +1 in France (where the sale originates) is five hours ahead of Eastern Daylight Time, six hours ahead of Central Daylight Time, seven hours ahead of Mountain Daylight Time and eight hours ahead of Pacific Daylight Time (and Mountain Standard Time, for all you goofy daylight wasters in Arizona).
12 AM "the next day" in France (GMT +1) =
7 PM today in New York, Washington, Miami, Toronto, etc. =
6 PM today in Chicago, New Orleans, Houston, Milwalkee, etc. =
5 PM today in Denver, Salt Lake City, Albuquerque, etc. =
4 PM today in Los Angeles, San Francisco, Seattle, Vancouver, etc. (and Flagstaff)