{"id":28465,"date":"2015-06-30T10:56:27","date_gmt":"2015-06-30T08:56:27","guid":{"rendered":"https:\/\/www.ufe.cz\/vlozeni-prestupne-sekundy\/"},"modified":"2025-08-20T11:06:05","modified_gmt":"2025-08-20T09:06:05","slug":"adding-a-leap-second","status":"publish","type":"post","link":"https:\/\/www.ufe.cz\/en\/adding-a-leap-second\/","title":{"rendered":"Adding a leap second"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"28465\" class=\"elementor elementor-28465 elementor-28453\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ae268d1 e-flex e-con-boxed e-con e-parent\" data-id=\"ae268d1\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-66e57aa elementor-widget elementor-widget-text-editor\" data-id=\"66e57aa\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>The IERS (International Earth Rotation and Reference System Service) organization announced the planned adjustment of the Coordinated Universal Time UTC by the insertion of a leap second to the last minute on 30 June 2015. In our country, this event will take place on July 1, 2015 at 1h 59m 59s local time.<\/p><p>We have staged this phenomenon on the atomic clock at our Laboratory of the National Time and Frequency Standard.<\/p><p>The first leap second was added in 1972. This year&#8217;s leap second will be the 26th since then.\u00a0The leap second can theoretically also be removed from the day, however, it has not yet occured.\u00a0<\/p><p>You can also watch the\u00a0<a href=\"http:\/\/www.ceskatelevize.cz\/ivysilani\/1097181328-udalosti\/215411000100630\/obsah\/410031-den-delsi-o-jednu-sekundu\" target=\"_blank\" rel=\"noopener\">Czech TV reportage here<\/a> (in Czech only).<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Today, on June 30, 2015, a leap second will be added at the end of the day.<\/p>\n","protected":false},"author":7,"featured_media":28455,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[51],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/posts\/28465"}],"collection":[{"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/comments?post=28465"}],"version-history":[{"count":0,"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/posts\/28465\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/media\/28455"}],"wp:attachment":[{"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/media?parent=28465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/categories?post=28465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufe.cz\/en\/wp-json\/wp\/v2\/tags?post=28465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}