World Clock

A time zone is a zone or region of the globe that contains a uniform standard time for business, social and legal purposes. Time zones also follows the boundaries of the countries and their subdivisions. A country may have single or multiple timezones. Almost all of the time zones are offset from Coordinated Universal Time (UTC) by a whole number of hours i.e. UTC−12 to UTC+14.

If we share same time all over the world then morning will be midday or evening or even midnight in other places of the world. Since different parts of the world have different day and night time current timezone system seems more scientific.

There is no time difference between Greenwich Mean Time (GMT) and Coordinated Universal Time (UTC). However there exist differences between them. GMT is a time zone whereas UTC is a time standard.

Daylight saving time (DST) is the part of the year when we advance our clocks by one hour, shifting the time of day in relation to where the Sun is above Earth. In other words, during DST the "daylight" begins an hour later in the morning and lasts an hour longer in the evening. This change helps keep the hours of daylight coordinated with the time that most people are active.