{"id":97009,"date":"2025-09-16T15:46:36","date_gmt":"2025-09-16T15:46:36","guid":{"rendered":"https:\/\/mycryptomania.com\/?p=97009"},"modified":"2025-09-16T15:46:36","modified_gmt":"2025-09-16T15:46:36","slug":"leap-seconds-time-in-solidity","status":"publish","type":"post","link":"https:\/\/mycryptomania.com\/?p=97009","title":{"rendered":"Leap Seconds & Time in Solidity"},"content":{"rendered":"

Sometimes concepts<\/a> we took for granted are challenged<\/a>. Did this happen to time recently?<\/p>\n

Should We Abandon the Leap\u00a0Second?<\/a><\/p>\n

Dealing<\/a> with dates and time is always tricky, and in Solidity there is no difference. Although<\/a> there are some keywords that help us like now and units like days or hours there are a few things<\/a> we have to keep in mind. You should also<\/a> keep in mind<\/a> that the EVM counts time in\u00a0seconds.<\/p>\n

Everything is a Unix timestamp<\/a>!<\/p>\n

In general, there are two options<\/a> to include a time factor into a Solidity contract: relating to the current<\/a> block number or relating<\/a> to the current timestamp. There are also two interesting<\/a> points, much thanks Roman Sivakov<\/a> & Banteg<\/a> for spotting<\/a> and bringing them up in a dev-chat:<\/p>\n

First, did you know that the future behavior of the Earth\u2019s rotation is unknown, so the UT1-UTC difference is unpredictable and can only be derived from <\/em>observations<\/em><\/a>?<\/em>Second, with very small <\/em>changes<\/em><\/a> in the angular velocity of the Earth\u2019s rotation, leap seconds can run up quite quickly, because a small change in angular velocity is multiplied by time, i.e., there is a cumulative effect. In <\/em>Paris<\/em><\/a>, by the way, there is a separate <\/em>department<\/em><\/a> that keeps an eye on the leap <\/em>seconds<\/em><\/a>\u00a0issue!<\/em><\/p>\n

Stay safe!<\/h4>\n

Leap Seconds & Time in Solidity<\/a> was originally published in Coinmonks<\/a> on Medium, where people are continuing the conversation by highlighting and responding to this story.<\/p>","protected":false},"excerpt":{"rendered":"

Sometimes concepts we took for granted are challenged. Did this happen to time recently? Should We Abandon the Leap\u00a0Second? Dealing with dates and time is always tricky, and in Solidity there is no difference. Although there are some keywords that help us like now and units like days or hours there are a few things […]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-97009","post","type-post","status-publish","format-standard","hentry","category-interesting"],"_links":{"self":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/97009"}],"collection":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=97009"}],"version-history":[{"count":0,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/97009\/revisions"}],"wp:attachment":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=97009"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=97009"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=97009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}