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Time Zone Boundaries V2015 User Guide

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Time Zone Boundaries V2015 User Guide TimeZoneInfo with DST Rules Copyright 2015 Stopwatch Data, LLC Table of Contents Introduction .................................................................................................................................................. 3 Overview ................................................................................................................................................... 3 Applications............................................................................................................................................... 4 Background and Reference Information ....................................................................................................... 5 Data Source and Methodology ................................................................................................................. 5 National Sovereign Territory ..................................................................................................................... 5 Map Depiction of Territorial Waters ......................................................................................................... 6 Frequency of Data Updates ...................................................................................................................... 7 Data Descriptions .......................................................................................................................................... 8 Time Zones Table ...................................................................................................................................... 8 Table Format ......................................................................................................................................... 8 DST Rules Table ....................................................................................................................................... 10 Table Format ....................................................................................................................................... 10 Date Rule Formats............................................................................................................................... 11 Introduction Introduction Overview Stopwatch Data’s TimeZoneInfo with DST Rules is A map of the World’s observed time zones (TimeZones file), and A collection of the rules and decrees by which Daylight Saving Time (DST) is honored (DST Rules file). Mapped Geographies Regarding landmasses, the TimeZone map depicts individual countries within their respective TimeZone. Individual countries are further subdivided, when multiple TimeZones and/or DST rules are observed. These landmass TimeZone boundaries have incorporated the territorial waters (typically twelve miles beyond each shoreline), since this area is regarded as sovereign territory of a state/country. Regarding the oceans/waters, the TimeZone map includes boundaries for each of the twenty-five nautical time zones. This completes timezone coverage over the entire globe. Rules and Decrees The attribute data for each boundary includes the offset in hours from Universal Coordinate Time (UTC) and, if DST is observed, the rules regarding the dates and times when DST starts and ends. Rules regarding DST dates are, for example, the first Sunday in November. DST rules, instead of explicit dates, make this product the natural choice for plugging into programs annually. Because, TimeZoneInfo also covers known future changes to DST rules that are scheduled to occur, by including date with year ranges along with the Rules, this again makes TimeZoneInfo perfect for applications that are restricted from updates. TimeZoneInfo with DST Rules 3 Copyright 2015 Stopwatch Data, LLC All Rights Reserved. Introduction Applications TimeZoneInfo is useful for determining the local time for any location in the World, whether on land or water. Coupled with the latitude/longitude coordinates of your geocoded business and customer information, you can use TimeZoneInfo for analysis of: marine and land-based sites emerging markets site location selection telecommunications and worldwide network development sales territory alignment worldwide shipping and distribution worldwide tracking search and rescue missions strategic military planning and command center operations homeland security initiatives communication control centers … and more TimeZoneInfo can help you make more informed business decisions, control costs, identify potential marketing opportunities, and enhance profitability. In addition, TimeZoneInfo has been developed to compliment Stopwatch Data’s WorldMap product. Coupled together, these two products provide an unparalleled resource for global analysis. TimeZoneInfo with DST Rules 4 Copyright 2015 Stopwatch Data, LLC All Rights Reserved. Background and Reference Information Background and Reference Information Data Source and Methodology The data in TimeZoneInfo is created from numerous resources researched by Stopwatch Data, LLC. Mapped Geographies The country map objects stem from Vector Map Level 0 and are constantly modified to reflect current country borders and their territorial waters. In addition, the country geographies and names have been updated to reflect the International Standards Organization (ISO) naming conventions and recognition of sovereign territories. The division of lands, islands, and waters into a timezone band have originally stemmed from the Central Intelligence Agency (CIA) publications. These allocations are updated by referencing atlases, and by contacting government agencies within individual countries. Rules and Decrees DST observed start/end times and dates, and DST rules stem from numerous sources including individual government web-sites and the examination of documented decrees set forth by each country. Not all countries observe DST, and of the countries that do, some parts might be exempt from following DST. To add to the complexity, a few countries vary the length of DST observance from year to year, making the start and end dates unpredictable. It has happened where a country decreed to remain on DST for several years. Therefore, the rules that exist for applying DST cannot always predict when DST is actually observed. National Sovereign Territory Countries bounded by water have sovereignty beyond the shore, known as territorial waters, or territorial sea. Territorial Waters is a belt of coastal waters extending twelve nautical miles (22 kilometers), (but can vary, at the coastal country's discretion) from the mean low water mark of a littoral state, or from internal waters, as per the 1982 United Nations Convention on the Law of the Sea. These territorial waters are regarded as the sovereign territory of the state (except that foreign ships, both military and civilian, are allowed innocent passage through it). Regarding lakes and bays, a sovereign state has complete jurisdiction over internal waters, where not even innocent passage is allowed. TimeZoneInfo with DST Rules 5 Copyright 2015 Stopwatch Data, LLC All Rights Reserved. Background and Reference Information Map Depiction of Territorial Waters TimeZoneInfo recognizes the need to honor time, based on the sovereign jurisdiction of nations. A 12 mile territorial boundary around coastal nations is depicted, and particularly important for marine operations upon waters. Territorial and Internal Waters are more closely and legally defined by the statements below, followed with the rules applied by Stopwatch Data, to create and depict a sovereign state’s waters. A) The mean low water mark may be an unlimited distance from permanently exposed land, provided that some portion of elevations exposed at low tide but covered at high tide (like mud flats) is within 12 nautical miles of permanently exposed land. Stopwatch Data uses the costal mean low water mark as defined by VMAP0 data from National Geospatial-Intelligence Agency (NGA). B) Completely enclosed seas, lakes, and rivers are considered internal waters. These types of water areas are depicted as the sovereign territory of the bounding country. C) Internal Waters constitute waters landward of lines connecting fringing islands along a coast or landward of lines across the mouths of rivers that flow into the sea. These types of water areas are depicted as the sovereign territory of the bounding country. D) Bays are defined as indentations between headlands having an area greater than that of a semicircle. If they do not exceed 24 nautical miles (44 km) between headlands then they are internal waters. These types of water areas are depicted as the sovereign territory of the bounding country. E) If a Bay’s entrance is wider than 24 nautical miles between the headlands, then that portion landward of a 24 nautical mile straight line that touches opposite low-water marks across the bay positioned to contain the greatest water area are internal waters. This defined boundary is depicted as the sovereign territory of the bounding country. F) All archipelagic waters within the outermost islands of an archipelagic state like Indonesia or the Philippines are also considered internal waters. These types of water areas are depicted as the sovereign territory of the bounding country. G) Other Rules The extension of the boundary at the coast, between two or more countries, is determined manually based on the following priority: i. presence of islands ii. angle of border within the landmass TimeZoneInfo with DST Rules 6 Copyright 2015 Stopwatch Data, LLC All Rights Reserved.
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