It's 8:30pm EST for the NA time slot tonight. It factors in the timechange for the next "clan battle week" which starts on this coming Wednesday.
In effect, the 4 clan battle days of this week (Wed -> Sun) are staying "the same" in terms of UTC time for consistency across all countries, since not all countries use Daylight Savings.
The time is listed in the infographic you posted.
It'll move back an hour UTC, which would return it to its previous time of 7:30pm EST (6:30pm CST).
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Note: I corrected the previous posts to say 8:30pm EST for tonight. I've lived most of my life in the EST timezone, so moving to the CST timezone me hits harder some days than others.
As stated on the infographic, the time moves to 2330 UTC. You can translate that to other timezones via Google.
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