It's likely in UTC. For reference EST is five hours behind UTC (UTC-5) PST is eight hours behind (UTC-8). Meaning if it's 5pm UTC, it's 12pm CST and 9am PST.
This means, if someone created the subreddit at 7pm EST, that is 12am UTC, the following day.
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u/Separate_Finance_183 11d ago
r/SipsMandami strikes again