Time is something that nobody seems to have these days, but everybody wants.
Back in the days it was a lot more difficult to know the exact time, but today, there are countless options.
Some are more precise than others.
For those that never want to be late, a Swiss watch is the way to go, but even so, it's precision means that it will always count one second as just only one perfect second, no more or less.
However, this doesn't mean that you set it perfectly, for this you need to find out the time from a reliable source.
Now, if even Swiss watches aren't 100% precise, then what is? The answer is simple: an atomic clock.
Atomic clock might sound a bit Sci-Fi at first, but just at first, since it's actually a really simple and useful thing to have, especially if you never want to be late and you always want to know the exact time.
Basically, an atomic clock is the most accurate time keeping clock ever known to man.
It uses atomic resonance frequency for timekeeping: this is the thing that makes it so accurate.
Due to that, atomic clocks are used to control the GPS satellite signals and also control the frequency of television broadcasts.
Even if they are called atomic there isn't any radiation involved, the signals being transmitted by microwaves, which makes them safe to use.
Atomic Alarm Clock Radios adjust themselves automatically during night-time, by receiving a signal from the nearest atomic clock.
There are several atomic clocks in the world that can transmit longwave radio: HBG (Switzerland), MSF (United Kingdom),JJY (Japan), DCF77 (Germany), WWVB (United States) and TDF (France), so no matter where you are, an atomic clock will give you the precise time.
Depending on the zone you're in there might be a delay in receiving the signal, about 1ms for every 186 miles, but even in this case your clock will be precise almost to the second.
Depending on the model you will choose, your atomic alarm clock radio will also adjust the date correctly each month and also it will adjust itself for daylight savings time.
Also, any atomic clock will be precise within 1 second every million years, which isn't that bad after all.
Overall, when buying an alarm clock, you should consider buying an atomic alarm clock radio, since the price difference isn't that high and you can be sure that no matter where you will go, you'll always know the exact time, in any moment of the day.
For the first million years, at least.