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Basically my night light feature is activated before the time set begins. An image is worth 1000 words in this case:
As you can see the time is 17:43 and night light should start at 18:00 but night light is already on at 17:43. Very very weird.
The proof that night light is on.
The night light starts to take effect earlier than the time set so that the user becomes accustomed to the change before it takes full effect.
It is a gradual process rather than an instant change.
There's a useful reference here
