{"id":966,"date":"2008-10-27T08:32:42","date_gmt":"2008-10-27T08:32:42","guid":{"rendered":"https:\/\/www.galsys.co.uk\/news\/?p=966"},"modified":"2018-05-08T14:00:36","modified_gmt":"2018-05-08T14:00:36","slug":"timescales-of-ntp-and-advanced-time-server-information","status":"publish","type":"post","link":"https:\/\/www.galsys.co.uk\/news\/timescales-of-ntp-and-advanced-time-server-information\/","title":{"rendered":"Timescales of NTP and advanced time server information"},"content":{"rendered":"

The NTP timescale is based on UTC<\/a> (Coordinated Universal Time) which is a global civil timescale that is based on International Atomic Time (TAI) but accounts for the slowing of the Earth\u2019s spin by intermittingly adding \u2018leap seconds.\u2019<\/p>\n

This is done to ensure that UTC is kept in coincidence with GMT (Greenwich Meantime, often referred to as UT1). Failing to account for the Earth\u2019s slowing in its rotation (and occasional speeding up) would mean that UTC would fall out of synchronisation with GMT and noon, when the sun is traditionally the highest in the sky would drift. In fact if leap seconds were not added eventually noon would fall at midnight and vice versa (albeit in several millennia).<\/p>\n

Not everybody is happy with leap seconds, there are those that feel that adding of seconds to keep the Earth\u2019s rotation and UTC inline is nothing but a fudge. However, failing to do so would make such things as astronomical observations impossible as astronomers need to know the exact positioning of the stellar bodies and farmers are pretty reliant on the Earth\u2019s rotation too.<\/p>\n

The NTP clock<\/a> represents time in a totally different way to the way humans perceive time. Instead of formatting time into minutes, hours, days, months and years, NTP uses a continuous number that represents the number of seconds that have past since 0h 1 January 1900. This is known as the prime epoch.<\/p>\n

The seconds counted from the prime epoch continue to rise but wraps around every 136 years. The first wrap-around will take place in 2036, 136 years since the prime epoch. To deal with this NTP will utilise an era integer, so when the seconds reset to zero, the integer 1 will represent the first era and negative integers represent the eras before the prime epoch.<\/p>\n

Time servers<\/a> that receive their time from the GPS system are not in fact receiving UTC, primarily because the GPS network was in development before the first leap second but they are based on TAI.\u00a0 However, GPS time is converted to UTC by the GPS time server.<\/p>\n

The radio transmission broadcast from national physics laboratories such as MSF, DCF or WWVB are all based on UTC and so the time servers do not need to do any conversion.<\/p>\n","protected":false},"excerpt":{"rendered":"

The NTP timescale is based on UTC (Coordinated Universal Time) which is a global civil timescale that is based on International Atomic Time (TAI) but accounts for the slowing of the Earth\u2019s spin by intermittingly adding \u2018leap seconds.\u2019 This is done to ensure that UTC is kept in coincidence with GMT (Greenwich Meantime, often referred…<\/p>\n

Continue reading <\/i><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,5,8,9,12],"tags":[19,20,207,126,25,68,26,27,28,204,29,30,205,34,35],"class_list":["post-966","post","type-post","status-publish","format-standard","hentry","category-advanced-ntp","category-chronology","category-ntp-configuration","category-ntp-server-2","category-time-server","tag-gps-ntp-server","tag-gps-ntp-time-server","tag-gps-time-server","tag-linu","tag-network-time-server","tag-ntp","tag-ntp-clock","tag-ntp-gps-server","tag-ntp-gps-time-server","tag-ntp-server-2","tag-ntp-servers","tag-ntp-time-server","tag-time-server","tag-windows-ntp-server","tag-windows-server-2008"],"yoast_head":"\nTimescales of NTP and advanced time server information - Galleon Systems<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.galsys.co.uk\/news\/timescales-of-ntp-and-advanced-time-server-information\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Timescales of NTP and advanced time server information - Galleon Systems\" \/>\n<meta property=\"og:description\" content=\"The NTP timescale is based on UTC (Coordinated Universal Time) which is a global civil timescale that is based on International Atomic Time (TAI) but accounts for the slowing of the Earth\u2019s spin by intermittingly adding \u2018leap seconds.\u2019 This is done to ensure that UTC is kept in coincidence with GMT (Greenwich Meantime, often referred…Continue reading\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.galsys.co.uk\/news\/timescales-of-ntp-and-advanced-time-server-information\/\" \/>\n<meta property=\"og:site_name\" content=\"Galleon Systems\" \/>\n<meta property=\"article:published_time\" content=\"2008-10-27T08:32:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-05-08T14:00:36+00:00\" \/>\n<meta name=\"author\" content=\"Stuart\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@GalleonSystems\" \/>\n<meta name=\"twitter:site\" content=\"@GalleonSystems\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Stuart\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/timescales-of-ntp-and-advanced-time-server-information\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/timescales-of-ntp-and-advanced-time-server-information\\\/\"},\"author\":{\"name\":\"Stuart\",\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/#\\\/schema\\\/person\\\/d0bc412239981453c0bcd039a511f32a\"},\"headline\":\"Timescales of NTP and advanced time server information\",\"datePublished\":\"2008-10-27T08:32:42+00:00\",\"dateModified\":\"2018-05-08T14:00:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/timescales-of-ntp-and-advanced-time-server-information\\\/\"},\"wordCount\":384,\"keywords\":[\"gps ntp server\",\"gps ntp time server\",\"gps time server\",\"linu\",\"network time server\",\"ntp\",\"ntp clock\",\"ntp gps server\",\"ntp gps time server\",\"ntp server\",\"ntp servers\",\"ntp time server\",\"time server\",\"windows ntp server\",\"windows server 2008\"],\"articleSection\":[\"advanced NTP\",\"chronology\",\"NTP configuration\",\"ntp server\",\"time server\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/timescales-of-ntp-and-advanced-time-server-information\\\/\",\"url\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/timescales-of-ntp-and-advanced-time-server-information\\\/\",\"name\":\"Timescales of NTP and advanced time server information - 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