Start with a confession that still embarrasses me.
For six months, my British IPTV customers thought I was incompetent. They were right. I just didn't know why.
The problem was subtle. A customer would look at the EPG and see that "Match of the Day" was scheduled for 10:30 PM. They would tune in at 10:30 PM. A completely different show would be playing. They would assume my guide data was wrong. They would stop trusting my service.
I checked my IPTV Reseller Panel settings. The EPG source was correct. The channel mapping was correct. Everything looked fine. I couldn't find the problem.
Here's the thing — the problem wasn't my settings. It was timezone. My panel's server was set to UTC. My EPG source was sending data in UTC. My British IPTV customers were in GMT/BST. But the panel wasn't converting. A show scheduled for 10:30 PM UTC appeared as 10:30 PM in the guide. But it actually aired at 9:30 PM UK time. Every listing was off by one hour.
In most cases, resellers never notice this because they don't watch their own service at different times of day. I watched at 8 PM. Everything seemed fine. I never checked the 10 PM listings.
What actually works is testing your EPG at multiple times of day. Check the guide at 6 AM, 12 PM, 6 PM, and 10 PM. Compare what the guide says to what's actually playing on a legitimate source (Freeview, Sky, or even a free streaming trial).
One real-world scenario: after I discovered the timezone bug, I spent 4 hours manually offsetting every UK channel in my IPTV Reseller Panel. Each channel needed a specific offset — some were off by an hour, some by 30 minutes, some were correct.
I fixed them one by one. Then I emailed my customers: "We've upgraded our guide data. Everything should be accurate now." I didn't admit the bug. I should have. But at least the problem was gone.
The pattern that keeps showing up is that timezone handling is broken in most panels by default. They assume the server, the source, and the customer are all in the same timezone. In British IPTV, they're almost never aligned.
Check your EPG at 10 PM tonight. Compare it to what's actually on BBC One. If there's a mismatch, you have a timezone bug. Fix it. Your customers will notice. Not because they'll thank you. Because they'll stop being confused.