I gave up telling that to people I know. They just answer that their only clock is their phone and it changes automatically.
I recently tried to warn some friends about a possible power outage and I told them to make sure that their flashlights all had fresh batteries. There response was that the only flashlights they own (in a house with 5 people) was on their cell phones and they had extra power packs for those.
They also don't listen to tornado warnings, have smoke detectors/carbon monoxide detectors, or keep their vehicles gassed up.
I give up .