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Same here, and I've also thought about writing the same app. I've always wondered why our system of time is built around the point of "midnight", when what we really care about is "sunrise". DST is an ugly hack that we use on top of our midnight-based time system to roughly approximate a constant sunrise time. Imagine if 00:00 was defined as the time that the sun rises. You could set your alarm to 00:00 and start wor…
Our system was originally based on noon, not midnight. I don't think most people really care about sunrise. Humans don't seem to naturally rise with the sun. I don't know anyone who plans their day based on when the sun rose. You'd have 3+ hour swings in what time meant from December to June. Seems worse than even daylight savings time.
I do regular trips in the back of beyond. The first day everyone is up until 10-11 O'Clock in front of the camp fire hanging around with a beer. By the third day, everyone is up at dawn and asleep at 8 O'Clock.
Humans absolutely rise with the sun naturally. We've just isolated ourselves from the natural environment and forced ourselves onto arbitrary schedules most of us have a completely screwed sense of time.
If you flex your day based on sunrise, you get more useful sunlight hours... which means more time for being outside enjoying the day instead of stuck indoors. It's also a lot easier to get moving based on natural light, our bodies are programmed for it much like they are programmed for a 24 hour day.
The big issue with daylight savings time is the loss of sleep due to it all happening at once. You don't have that issue if you just have an alarm that wakes you at sunrise.