Well, I just saw it... I didn't notice that any dialog suggested that the sun was in fact shining during the night. It was light on this last night, but the brightness may not have been coming directly from the sun. The cause of the world ending was never mentioned but as it had been known for months and it could be predicted to the minute, it seems to be some astronomical phenomenon.
In the real world, I doubt anything could be timed so accurately, but in the film we are to assume it is true. So... Maybe it's something like our sun going supernova. In this case the brightly glowing body in the night sky could be the moon, reflecting the, suddenly vastly brighter, sun and the timed event could be the arrival of the shockwave in the atmosphere at the peak of the event as the earth begins to boil away on the opposite side, facing the sun. The effect wouldn't be simultaneous worldwide, nor instantaneous... but pretty close.
Of course, this supernova-like effect may have caused the sun to "flicker" or brighten previously, but I don't recall anybody mentioning that it had been shining brightly enough to put an end to night for the whole period during which the end of the world was anticipated.
I'm not saying that a scientific(ish) explanation is required to enjoy the movie, but maybe it will fix the problem for anyone who actually is concerned that the title is somehow inaccurate.
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