The time zones in the contiguous United States are often referred to by their generic name, without making a difference between standard time and DST designations. For example, Mountain Time (MT) refers to Mountain Standard Time (MST) or Mountain Daylight Time (MDT), depending on which is currently in use.

The plan looked like this: The world would be divided into 24 time zones based on the 24 hours in each day. Each of the time zones would be defined by a meridian, or a north-south line.

A biogeographic zone is a geographical region with a shared biotic composition that differs, on average, from other biogeographic zones. India has been classified into 10 biogeographic zones (Figure 1) and further sub-divided into 27 biogeographic provinces (Rodgers and Panwar 1988, Singh and Kushwaha, 2008): Figure 1.

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The 24 time zones, created according to each hour of the day, are drawn vertically like longitudes over the globe. UTC or the Coordinated Universal Time is used to regulate dates and times worldwide. Here are the highlights about the UTC:

Why do you think Australia has different time zones? Australia’s external territories observe different time zones. Standard time was introduced in the 1890s when all of the Australian colonies adopted it. Before the switch to standard time zones, each local city or town was free to determine its local time, called local mean time.