I dunno. I have yet to actually catch the first twenty minutes of that movie. But in the DAWN remake, we hear that someone was bitten in a bar fight in the morning hours of Day Zero, and moved to ICU later that afternoon; we may assume he was one of the first to be bitten by zombies.
The morning of Day One, our heroine’s hubbins is attacked, killed, and then tries to eat HER. She flees, to see that her entire neighborhood (and the entire town) is alive with madness and anarchy, as the living dead hunt the living.
At some point later that day, she and her new friends arrive at the mall. Shortly thereafter, we see a montage of news broadcasts on TVs in the appliance section of a store. All hell is breaking loose worldwide. No one knows anything.
At some point later, an announcer is seen announcing that his station is going off the air, and he doesn’t know when they’ll be coming back on. It is implied that this is the case with all other stations, too. It isn’t a hundred percent clear exactly when this happens, but it is implied that it occurs on Day One or Day Two.
Now, admittedly, the new zombies are WAY meaner than the old ones. They tend to swarm, and they run like sonsabitches. It’s easy to see how the news stations would tend to blink out, one by one, fairly quickly… but, again, howthehell is the disease spreading so damn fast? And how’d we get worldwide in ONE DAY? Man, that’s faster and meaner than Ebola, Smallpox, and the Bubonic Plague, all put together!