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The world is divided into a number of standard time zones.
Roughly speaking, there are 24 time zones spaced at intervals of 15° in longitude.
Practically, due to geographic and political factors, the boundaries of time zones are more circuitous.
In addition, a few time zones are offset by an odd number of half hours from the Greenwich and U.S. time zones.
Within the confines of each time zone, the hour and minute of the day is defined to be the same.
Time zones eliminate the problem that local noon (defined according to the elevation of the Sun) actually occurs at a different time for nearby towns at slightly different longitudes, so that each town's clocks differ by a few minutes from those of neighboring clocks.
This problem was already encountered in making up timetables for long distance train travel, but became completely unmanageable with the advent of modern air travel.
Defining time zones means than watches need only be adjusted in one hour steps upon crossing of a time zone boundary, as opposed to continuously along any east-west journey. Time zones are usually specified by the number of hours they differ from Greenwich mean time.
Greenwich, England is defined as the 0 of longitude, and is the center of the Greenwich time zone, relative to which other time zones are usually referenced.
For example, U.S. Eastern Standard Time (EST) is UT - 5 hours, U.S. Central Time (CST) is UT - 6 hours, U.S. Mountain Time (MST) is UT - 7 hours, and U.S. Pacific Time (PST) is UT - 8 hours. Almost all time zones differ an integral number of hours from GMT, but there are a number, the most famous of which in North America is Newfoundland, which differ by an odd number of half-hours.
Other examples are Iran, Afghanistan, India, Nepal, Myanmar, and central Australia. A construct related to time zones is the international date line at the 180° meridian, which occurs (mostly) in the middle of the time zone offset 12 hours from Greenwich.
Download trial Buy now ($60.00) Vendor: BlackBytes Software & Consultancy, Ltd. Keywords:
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1. NetworkTime for .NET Plus Edition
The NetworkTime for.NET Plus Edition has extended functionality and provides you in addition to series of RFC-compliant time clients that can be used to synchronize computer(s) with a remote reference systems, also classes which enable you to convert time from any time zone to other time zone and track the local time. Details Download trial Buy now ($127.00) Find similar Vendor: BlackBytes Software & Consultancy, Ltd.
2. Atomic Time Zone Server.NET (250 Client License)
Atomic Time Zone Server.NET expands on our product experience in building world class network time servers. Shipping with a total of 5 time protocols, ATZ Server.NET is the only time server in the world to offer all the worlds major time protocols in one tight package. Details Download trial (Demo: 2.2 MB) Buy now ($399.95) Find similar Platform: Windows NT, Windows 2000, Windows XP, Windows 98, Windows ME, Windows Server 2003 Vendor: Americas Multimedia Online
3. ZoneTick World Time Zone Clock - Unlimited Site License
Details Download trial (Full version: 303.3 KB) Buy now ($995.00) Find similar Platform: Windows 95, Windows NT, Windows 2000, Windows XP, Windows 98, Windows ME, Windows Server 2003 Vendor: WR Consulting
4. Atomic Time Zone
Details Download trial (Demo: 2.2 MB) Buy now ($19.95) Find similar Platform: Windows 95, Windows NT, Windows 2000, Windows XP, Windows 98, Windows ME Vendor: Americas Multimedia Online
5. Ace Clock Pro (Single license)
Ace Clock Pro is a skinable speaking desktop clock with fully customizable transparent clock display, analog and digital modes, powerful alarms system with templates, atomic time synchronization, time zones, calendar with dates calculator, quick reminders, tooltip and much more. Details Download trial Buy now ($24.95) Find similar Platform: Windows 95, Windows NT, Windows 2000, Windows XP, Windows 98, Windows ME Vendor: ECREW Developers, Inc. |
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