![]() ![]() Changes in "clock-time" are done abruptly in 1h steps around the globe according to the position of the country, avoiding having millions of time zones with very small differences between them. The world time zones try to group areas with the same solar time and give them a common date and time. In an attempt to organize this difference while still keeping a certain relation between the date and time with the position of the sun in the sky, the time zones were born. In reality, the Earth is round, which means that the position of the sun at a given time depends on our position on the Earth. From this, one could tell the time by just looking at the sun and its position in the sky. ![]() The movement of the sun in the sky is periodic, so a complete rotation of the sun (in reality, this movement is due to the Earth spinning and not the sun moving) takes what we call a day by dividing that period of time by 24, we get hours. The date was more or less given by the apparent movement of the stars in the sky, whilst the time was taken by looking at the sun. Historically, the way we humans have kept track of the date and time has been by looking at the sky. However, that leads to the question of how do you define a day. Another way of timekeeping could be counting days instead of seconds, like what you can do with the day counter. Computers deal with time using what is called Unix time or epoch time, which basically means counting seconds from a fixed date and time, as we have explained in depth in the Unix time converter. There are many ways in which we can keep track of time. Many might be asking this question, and we think it's important to answer it to at least make a point for the use of the time zones converter.
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