About World Clock & Map

Global Timezone Map displays current time and daylight in any place around the world right now.

WorldTime Clock & Map is an indispensable utility for everyone who deals with people abroad or anybody who is keen on knowing what time is it further than locally.

This advanced application is very helpful for travelers who need to know time difference around the world and want to be aware of world timezones they are traveling to, as well as for businesses which are located in international timezones and want to connect with their partners and customers.

Map also gives answer to questions: where is it daylight, night or midnight right now?

Just click on “Settings” button on the top-right of the map and discover how you can customize the map yourself! New features like the ability to add more clocks and set alarms were added recently and general usability was improved. Furthermore, we have developed brand-new HTML Clocks for Europe, Australia, Canada and United States, making usage even more easy!

More About World Time

Coordinated Universal Time (UTC) and Greenwich Mean Time (GMT)

Coordinated Universal Time (UTC) is the basis for modern civil time. Since January 1, 1972, it has been defined to follow International Atomic Time (TAI) with an exact offset of an integer number of seconds, changing only when a leap second is added to keep clocks synchronized with the rotation of the Earth.

Greenwich Mean Time (GMT) is an older standard, adopted starting with British railroads in 1847. Using telescopes instead of atomic clocks, GMT was calibrated to the mean solar time at the Royal Observatory, Greenwich in the UK. Universal Time (UT) is the modern term for the international telescope-based system, adopted to replace “Greenwich Mean Time” in 1928 by the International Astronomical Union. Observations at the Greenwich Observatory itself ceased in 1954, though the location is still used as the basis for the coordinate system. Because the rotational period of Earth is not perfectly constant, the duration of a second would vary if calibrated to a telescope-based standard like GMT or UT – in which a second was defined as a fraction of a day or year. The terms “GMT” and “Greenwich Mean Time” are sometimes used informally to refer to UTC.

World Timezones

Earth is split up into a number of timezones. Most timezones are exactly one hour apart, and by convention compute their localtime as an offset from UTC or GMT. In many locations these offsets vary twice yearly due to DST transitions.

A timezone is a region on Earth, more or less bounded by lines of longitude, that has a uniform, legally mandated standard time, usually referred to as the localtime. By convention, the 24 main timezones on Earth compute their localtime as an offset from UTC, each timezone boundary being ostensibly 15 degrees east or west of the preceding one. The reference point for UTC is the Greenwich Meridian (the Prime Meridian), which has a longitude of 0°. Localtime is UTC plus the current timezone offset for the location in question. A corresponding one hour decrease relative to UTC occurs every 15° heading westward from the western boundary of the UTC timezone, up to the International Date Line.

Daylight Saving Time

DST also known as “summer time” is the practice of temporarily advancing clocks so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn.

In a typical case where a one-hour shift occurs at 02:00 localtime, in spring the clock jumps forward from 02:00 standard time to 03:00 DST and that day has 23 hours, whereas in autumn the clock jumps backward from 02:00 DST to 01:00 standard time, repeating that hour, and that day has 25 hours. A digital display of local time does not read 02:00 exactly at the shift, but instead jumps from 01:59:59.9 either forward to 03:00:00.0 or backward to 01:00:00.0. In this example, a location observing UTC+2 during standard time is at UTC+3 during DST; conversely, a location at UTC−5 during standard time is at UTC−4 during DST. Clock shifts are usually scheduled near a weekend midnight to lessen disruption to weekday schedules.