{"id":27401,"date":"2021-01-07T21:02:40","date_gmt":"2021-01-07T21:02:40","guid":{"rendered":"https:\/\/www.horbiter.com\/time-zones-what-they-are-and-how-to-calculate-them\/"},"modified":"2021-11-26T15:16:39","modified_gmt":"2021-11-26T15:16:39","slug":"time-zones-what-they-are-and-how-calculate-them","status":"publish","type":"post","link":"https:\/\/www.horbiter.com\/en\/time-zones-what-they-are-and-how-calculate-them\/","title":{"rendered":"Time zones, what they are and how to calculate them"},"content":{"rendered":"<p style=\"text-align:justify\">Time zones are the result of the Earth's almost spherical shape and its rotation around the Sun. Simply put, when the Earth is exposing its surface to the Sun, it captures light. With the face mentioned above, receiving sunlight, the opposite side is dark instead.<\/p>\n<p style=\"text-align:justify\">How the sunlight is hitting the Earth's surface can be easily reproduced by placing a tennis ball in front of a lamp: the side close to the lamp is perfectly illuminated, the opposite is in darkness, and those in-between turn from light to shadow, and the other way round. However, <em>\"day\"<\/em> and <em>\"night\"<\/em> are generic definitions.<\/p>\n<p style=\"text-align:justify\">According to conventional rules, time is split into <strong>24 hours<\/strong>. Here is the next question: what time is it when standing in an area located in front of the lamp, compared to the same place on the dark side instead? That's where time zones come into play.<\/p>\n<h2 style=\"text-align:justify\" id=\"time-zone-calculation-how-do-i-know-what-time-it-is\">Time zone calculation: how do I know what time it is?<\/h2>\n<p style=\"text-align:justify\">Time zones determine the time across the segment hit or not by sunlight. Take an orange, for example. Each slice of that orange has a different time compared to the other ones.<\/p>\n<p style=\"text-align:justify\">Moving from <strong>Italy<\/strong> to the <strong>United States<\/strong> is like choosing another <em>\"slice.\"<\/em> How can we define what time they are? Generally, you can apply a rule as useful as easy to remember when moving from the home time:<\/p>\n<ul>\n<li style=\"text-align:justify\">\n<p>if you're traveling West, please move the hour hand back;<\/p>\n<\/li>\n<li style=\"text-align:justify\">\n<p>if you're traveling East, please move the hour hand forward.<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align:justify\">Just take a map; in those countries placed on your right (east), it is later in the day. Viceversa, in those set on the left (West), it is earlier instead.<\/p>\n<p style=\"text-align:justify\">It means in most countries, depending on your home time, you can even jump forward to the following day or back to the previous one. For example, if it's <strong>11 pm<\/strong> in <strong>Italy<\/strong> on a Saturday evening, it is <strong>7 am<\/strong> in <strong>Japan<\/strong> on a Sunday, since they are <strong>8 hours<\/strong> back.<\/p>\n<h2 style=\"text-align:justify\" id=\"time-zones-around-the-world-same-time-different-hours\">Time zones around the world. Same time, different hours<\/h2>\n<p style=\"text-align:justify\">If there were any doubts about the time difference between one place and another on the planet, it would be enough to do the following experiment. At <strong>9<\/strong> in the morning, in <strong>Rome<\/strong>, you might call a friend living in <strong>New York<\/strong>. He most probably won't answer you; if he or she does, be sure he won't be happy to get that call.<\/p>\n<p style=\"text-align:justify\">When it is <strong>9 am<\/strong> in <strong>Rome<\/strong>, it is <strong>3 am<\/strong> on the <strong>US<\/strong>'s East Coast instead. Taking <strong>Rome<\/strong> time as a reference, let's now list the timetables across some of the world's leading cities.<\/p>\n<h2 style=\"text-align:justify\" id=\"time-zone-in-europe\">Time zone in Europe<\/h2>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>Paris<\/strong>: same time as Rome<\/p>\n<\/li>\n<li style=\"text-align:justify\">\n<p><strong>Madrid<\/strong>: same time as Rome<\/p>\n<\/li>\n<li style=\"text-align:justify\">\n<p><strong>Berlin<\/strong>: same time as Rome<\/p>\n<\/li>\n<li style=\"text-align:justify\">\n<p><strong>London<\/strong>: one hour back<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align:justify\"><img decoding=\"async\" alt=\"time-zone-london\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-london.81814ead9f39.jpg\" style=\"width:100%\" title=\"time-zone-london\"><\/p>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>Lisbon<\/strong>: one hour back<\/p>\n<\/li>\n<\/ul>\n<h2 style=\"text-align:justify\" id=\"time-zone-in-the-united-states\">Time zone in the United States<\/h2>\n<p style=\"text-align:justify\">The <strong>United States<\/strong> is multiple hours forward. Also, given the territory's extension from the West to the East coast, the <strong>US<\/strong> include various timezones:<\/p>\n<ul>\n<li>\n<p><strong>New York<\/strong>: 6 hours back<\/p>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" alt=\"time-zone-new-york\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-new-york.bce0d08f8f6e.jpg\" style=\"width:100%\" title=\"time-zone-new-york\"><\/p>\n<ul>\n<li>\n<p><strong>Los Angeles<\/strong>: 9 hours back<\/p>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" alt=\"time-zone-los-angeles\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-los-angeles.dd0db4e4f9d9.jpg\" style=\"width:100%\" title=\"time-zone-los-angeles\"><\/p>\n<ul>\n<li>\n<p><strong>Austin<\/strong>: 7 hours back<\/p>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" alt=\"time-zone-austin\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-austin.a4e446b14553.jpg\" style=\"width:100%\" title=\"time-zone-austin\"><\/p>\n<ul>\n<li>\n<p><strong>Chicago<\/strong>: 7 hours back<\/p>\n<\/li>\n<li>\n<p><strong>Denver<\/strong>: 8 hours back<\/p>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" alt=\"time-zone-denver\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-denver.01440be03396.jpg\" style=\"width:100%\" title=\"time-zone-denver\"><\/p>\n<ul>\n<li>\n<p><strong>Las Vegas<\/strong>: 9 hours back<\/p>\n<\/li>\n<\/ul>\n<h2 id=\"time-zones-in-asia\">Time zones in Asia<\/h2>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>Tokyo<\/strong>: 8 hours forward<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align:justify\"><img decoding=\"async\" alt=\"time-zone-tokyo\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-tokyo.4aada57cd44b.jpg\" style=\"width:100%\" title=\"time-zone-tokyo\"><\/p>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>Beijing<\/strong>: 7 hours forward<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align:justify\"><img decoding=\"async\" alt=\"time-zone-peking\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-peking.171139092ec8.jpg\" style=\"width:100%\" title=\"time-zone-peking\"><\/p>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>Moscow<\/strong>: 2 hours forward<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align:justify\"><img decoding=\"async\" alt=\"time-zone-moscow\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-moscow.2ac95bea1864.jpg\" style=\"width:100%\" title=\"time-zone-moscow\"><\/p>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>New Delhi<\/strong>: 4 hours and 30 minutes forward<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align:justify\"><img decoding=\"async\" alt=\"time-zone-new-delhi\" src=\"\/media\/CACHE\/images\/uploads\/time-zone-new-delhi.fe1a79aaa8f8.jpg\" style=\"width:100%\" title=\"time-zone-new-delhi\"><\/p>\n<h2 id=\"time-zones-in-australia\">Time zones in Australia<\/h2>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>Sidney<\/strong>: 10 hours forward<\/p>\n<\/li>\n<li style=\"text-align:justify\">\n<p><strong>Melbourne<\/strong>: 10 hours aforward<\/p>\n<\/li>\n<\/ul>\n<h2 id=\"time-zones-in-south-america\">Time zones in South America<\/h2>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>Rio de Janeiro<\/strong>: 4 hours back<\/p>\n<\/li>\n<li style=\"text-align:justify\">\n<p><strong>Buenos Aires<\/strong>: 4 hours back<\/p>\n<\/li>\n<li style=\"text-align:justify\">\n<p><strong>Bogota<\/strong>: 6 hours back<\/p>\n<\/li>\n<\/ul>\n<h2 id=\"time-zones-in-africa\">Time zones in Africa<\/h2>\n<ul>\n<li>\n<p><strong>Cairo<\/strong>: one hour forward<\/p>\n<\/li>\n<li>\n<p><strong>Algiers<\/strong>: same time as Rome<\/p>\n<\/li>\n<li>\n<p><strong>Nairobi<\/strong>: 2 hours forward<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align:justify\">These are the time zones of some of the most relevant cities in the world. You can find a comprehensive overview of the world's timezones here\u00a0<a href=\"https:\/\/time.is\/Italy\" target=\"_blank\" rel=\"noopener\"><span style=\"color:#0000ff\"><strong>https:\/\/time.is\/it<\/strong><\/span><\/a>.<\/p>\n<h2 id=\"time-zones-map\">Time zones map<\/h2>\n<p style=\"text-align:justify\">If you're looking for a map including all the universally listed timezones so far, you might find the full chart below pretty useful. You can quickly get how time is changing, from east to West, given the distance traveled from a chosen city or timezone.<\/p>\n<p style=\"text-align:justify\"><img decoding=\"async\" alt=\"world-time-zones-map\" src=\"\/media\/CACHE\/images\/uploads\/world-time-zones-map.4146578b6ff4.jpg\" style=\"width:100%\" title=\"world-time-zones-map\"><\/p>\n<h2 id=\"time-zones-of-the-world-who-decided-where-to-start-to-define-them\">Time zones of the world: who decided where to start to define them?<\/h2>\n<p style=\"text-align:justify\">We have seen the map, including time zones from all over the world, using <strong>Rome<\/strong> as a common reference point. Each person is free to adopt whatever reference town and own timetable; nonetheless, a reference standard is needed, and here it comes.<\/p>\n<p style=\"text-align:justify\">Hour zero, else said the starting point, is defined by the meridian passing through the <strong>Greenwich Observatory<\/strong> in <strong>London<\/strong>. The meridians are imaginary vertical lines representing the so-called \"segments\" into which planet earth is divided. Initially, this point was called <strong>GMT<\/strong>, or <em>\"Greenwich Mean Time.\"<\/em><\/p>\n<p style=\"text-align:justify\">This acronym was later changed to <strong>UTC<\/strong>, meaning <em>\"Universal Time Coordinated.\"<\/em> Every time in the world is, therefore, calculated as a multiple of the <strong>UTC<\/strong>. As an example, <strong>Rome<\/strong> time is <strong>UTC + 1<\/strong>. It means we are one hour later than <strong>Greenwich Mean Time<\/strong>.<\/p>\n<h2 id=\"time-zones-how-many-are-they\">Time zones: how many are they?<\/h2>\n<p style=\"text-align:justify\">As a result, we might end up thinking planet earth is split into <strong>24<\/strong>. It is not; they are <strong>39<\/strong> indeed. Across the globe, there are countries whose timezone adds <strong>30<\/strong> or <strong>45 minutes<\/strong> on top of the reference time we mentioned above (UTC).<\/p>\n<p style=\"text-align:justify\">It is why, for instance, <strong>Nepal<\/strong>'s home time is <strong>4 hours and 45 minutes<\/strong> forward than <strong>Rome<\/strong> time (i.e., 5 hours and 45 minutes compared to UTC). In <strong>Afghanistan<\/strong>, home time is <strong>3 hours and 30<\/strong> forward than <strong>Rome<\/strong> (4 hours and 30 minutes compared to UTC).<\/p>\n<p style=\"text-align:justify\">If you have read this article carefully, you should have noticed such an off-standard behavior when listing time zones in <strong>Asia<\/strong>.<\/p>\n<h2 id=\"are-there-any-wristwatches-capable-of-measuring-such-off-the-standard-time-zones\">Are there any wristwatches capable of measuring such off-the-standard time zones?<\/h2>\n<p style=\"text-align:justify\">Yes, there are, and they belong to the premium luxury class of products.<\/p>\n<p style=\"text-align:justify\">The <a href=\"https:\/\/www.horbiter.com\/en\/glashuette-original-senator-cosmopolite-hands-on-review\/\" target=\"_self\" rel=\"noopener\"><span style=\"color:#0000ff\"><strong>Glash\u00fctte Original Senator Cosmopolite<\/strong><\/span><\/a> is up to the task, for example. It is an extremely refined timepiece offering stand-out engineering that we have extensively described <strong>in-depth<\/strong>.<\/p>\n<p style=\"text-align:justify\">It is extraordinary either from an engineering point of view and for its style, geared towards the most demanding watch connoisseur.<\/p>\n<h2 id=\"time-zones-one-last-point\">Time zones: one last point<\/h2>\n<p style=\"text-align:justify\">Despite the scientific explanations about time zones, let's always bear in mind that time is a human convention. It is a standard to manage our lives, standardize light to shadow change, and vice versa.<\/p>\n<p style=\"text-align:justify\">According to economic, political, environmental agreements, the hour standard is subject to change as a social convention. For example, <strong>France<\/strong> and <strong>Spain<\/strong> share the same time zone as <strong>Italy<\/strong>, although not belonging to the same <em>\"segment.\" <\/em>This standard helps to foster business relationships.<\/p>\n<p style=\"text-align:justify\">As proof of this concept, let's finally introduce:<\/p>\n<ul>\n<li style=\"text-align:justify\">\n<p><strong>Solar time<\/strong>: it is naturally marked by the Sun's light, which hits different Earth portions according to Earth's rotation.\u00a0<\/p>\n<\/li>\n<li style=\"text-align:justify\">\n<p><strong>Daylight Saving Time<\/strong>:\u00a0It is, again, a convention where we advance our clocks by one hour to save energy. In <strong>2021<\/strong>, daylight saving time will come effective in October, during the night between 27 and 28. At 2.00 in the morning, we should move our timepiece's hands one hour move forward.<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align:justify\">(Photo credit: Marco Antinori for Horbiter\u00ae)<\/p>\n<p style=\"text-align:right\">Tommaso Sabia @Horbiter\u00ae<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Time zones are the result of the Earth&#8217;s almost spherical shape and its rotation around the Sun. Simply put, when the Earth is exposing its surface to the Sun, it captures light. With the face mentioned above, receiving sunlight, the opposite side is dark instead. How the sunlight is hitting the Earth&#8217;s surface can be [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.horbiter.com\/en\/time-zones-what-they-are-and-how-calculate-them\/\">Read More&#8230;<span class=\"screen-reader-text\"> from Time zones, what they are and how to calculate them<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15552,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[584],"tags":[],"class_list":["post-27401","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-passion-for-watches"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>time zones<\/title>\n<meta name=\"description\" content=\"Are you interested in calculating time zones around the world? 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