Daylight saving time: why it exists and why it’s dying

First, the myth that refuses to die: daylight saving time was not made for farmers. Farmers hated it — cows don't read clocks — and farm lobbies fought it for decades. DST was a wartime fuel-saving measure, first adopted by Germany in 1916, copied by everyone else, and then kept because evening daylight turned out to be popular and commercially useful.

Does it actually save energy?

Barely, if at all. The original logic — less evening lighting — made sense in 1916. Modern studies keep finding effects near zero: whatever you save on lighting, you spend on air conditioning and heating at different hours. Meanwhile the clock changes themselves carry measurable costs — sleep researchers have documented upticks in heart attacks and car accidents in the days after the spring shift.

That's why the medical consensus that has emerged favors permanent STANDARD time (aligned with the sun), while politicians and retail lobbies tend to push permanent daylight time (more evening light for shopping). The US actually tried year-round DST in 1974 — dark winter school mornings made it deeply unpopular within months.

The scheduling trap DST creates

For anyone working across borders, the dangerous weeks are the mismatched ones. The US springs forward in early March; Europe waits until late March. For those weeks, New York-London shrinks from 5 hours to 4, and every recurring meeting silently shifts for one side. The southern hemisphere flips the whole dance — Sydney's DST runs October to April.

Defensive habits: schedule international meetings in the receiver's local time, sanity-check differences during March, April, October, and November (the converter above always reflects the current rules), and never hardcode an offset like 'UTC-5' for a place that observes DST — that number is wrong half the year.