{"id":1183,"date":"2023-07-27T09:13:26","date_gmt":"2023-07-27T09:13:26","guid":{"rendered":"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/"},"modified":"2023-07-27T09:13:26","modified_gmt":"2023-07-27T09:13:26","slug":"convertire-le-stringhe-in-date-in-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/","title":{"rendered":"Come convertire stringhe in date in r (con esempi)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Spesso quando importi dati di data e ora in R, i valori verranno importati come stringhe.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Il modo pi\u00f9 semplice per convertire stringhe in date in R \u00e8 utilizzare la funzione <strong>as.Date()<\/strong> , che utilizza la seguente sintassi:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>like.Date(x, formato)<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Oro:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>x:<\/strong> un singolo valore stringa o un vettore di valori stringa.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>formato:<\/strong> il formato da utilizzare per la data. Il valore predefinito \u00e8 AAAA-MM-GG.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">\u00c8 possibile utilizzare il comando <strong>?strftime<\/strong> in R per visualizzare un elenco completo di argomenti disponibili da utilizzare per il formato della data, ma i pi\u00f9 comuni includono:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>%d:<\/strong> giorno del mese come numero decimale (01-31)<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>%m:<\/strong> mese come numero decimale (01-12)<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>%y:<\/strong> anno senza secolo (ad esempio 04)<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>%Y:<\/strong> anno con secolo (ad esempio 2004)<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Questo tutorial mostra diversi esempi di utilizzo pratico della funzione <strong>as.Date()<\/strong> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 1: convertire una singola stringa in una data<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come convertire un singolo valore di stringa in una data:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create string value<\/span>\nx &lt;- c(\" <span style=\"color: #008000;\">2021-07-24<\/span> \")\n\n<span style=\"color: #008080;\">#convert string to date<\/span>\nnew &lt;- as.Date(x, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \")\nnew\n\n[1] \"2021-07-24\"\n\n<span style=\"color: #008080;\">#check class of new variable\n<\/span>class(new)\n\n[1] \u201cDate\u201d\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 2: convertire un vettore di stringhe in date<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come convertire un vettore di stringhe in date:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create vector of strings<\/span>\nx &lt;- c(\" <span style=\"color: #008000;\">2021-07-24<\/span> \", \" <span style=\"color: #008000;\">2021-07-26<\/span> \", \" <span style=\"color: #008000;\">2021-07-30<\/span> \")\n\n<span style=\"color: #008080;\">#convert string to date<\/span>\nnew &lt;- as.Date(x, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \")\nnew\n\n[1] \"2021-07-24\" \"2021-07-26\" \"2021-07-30\"\n\n<span style=\"color: #008080;\">#check class of new variable\n<\/span>class(new)\n\n[1] \u201cDate\u201d<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 3: convertire una colonna di frame di dati in date<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come convertire una colonna di blockchain di dati in date:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(day = c(\" <span style=\"color: #008000;\">2021-07-24<\/span> \", \" <span style=\"color: #008000;\">2021-07-26<\/span> \", \" <span style=\"color: #008000;\">2021-07-30<\/span> \"),\n                 sales=c(22, 25, 28),\n                 products=c(3, 6, 7))\n\n<span style=\"color: #008080;\">#view structure of data frame\n<\/span>str(df)\n\n'data.frame': 3 obs. of 3 variables:\n $ day: Factor w\/ 3 levels \"2021-07-24\",\"2021-07-26\",..: 1 2 3\n $ sales: num 22 25 28\n $products: num 3 6 7\n\n<span style=\"color: #008080;\">#convert <i>day<\/i> variable to date<\/span>\ndf$day &lt;- as.Date(df$day, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \")\n\n<span style=\"color: #008080;\">#view structure of new data frame\n<\/span>str(df)\n\n'data.frame': 3 obs. of 3 variables:\n $day: Date, format: \"2021-07-24\" \"2021-07-26\" ...\n $ sales: num 22 25 28\n $products: num 3 6 7\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 4: convertire pi\u00f9 colonne di cornici di data in date<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come convertire pi\u00f9 colonne di blockchain di dati in date:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(start = c(\" <span style=\"color: #008000;\">2021-07-24<\/span> \", \" <span style=\"color: #008000;\">2021-07-26<\/span> \", \" <span style=\"color: #008000;\">2021-07-30<\/span> \"),\n                 end = c(\" <span style=\"color: #008000;\">2021-07-25<\/span> \", \" <span style=\"color: #008000;\">2021-07-28<\/span> \", \" <span style=\"color: #008000;\">2021-08-02<\/span> \"),\n                 products=c(3, 6, 7))\n\n<span style=\"color: #008080;\">#view structure of data frame\n<\/span>str(df)\n\n'data.frame': 3 obs. of 3 variables:\n $ start: Factor w\/ 3 levels \"2021-07-24\",\"2021-07-26\",..: 1 2 3\n $ end: Factor w\/ 3 levels \"2021-07-25\",\"2021-07-28\",..: 1 2 3\n $products: num 3 6 7\n\n<span style=\"color: #008080;\">#convert <i>start<\/i> and <em>end<\/em> variables to date<\/span>\ndf[,c(' <span style=\"color: #008000;\">start<\/span> ', ' <span style=\"color: #008000;\">end<\/span> ')] = <span style=\"color: #3366ff;\">lapply<\/span> (df[,c(' <span style=\"color: #008000;\">start<\/span> ', ' <span style=\"color: #008000;\">end<\/span> ')],\n                                function(x) as.Date(x, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \"))\n\n<span style=\"color: #008080;\">#view structure of new data frame\n<\/span>str(df)\n\n'data.frame': 3 obs. of 3 variables:\n $start: Date, format: \"2021-07-24\" \"2021-07-26\" ...\n $end: Date, format: \"2021-07-25\" \"2021-07-28\" ...\n $products: num 3 6 7<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Puoi saperne di pi\u00f9 sulla funzione <strong>lapply()<\/strong> utilizzata in questo esempio <a href=\"https:\/\/statorials.org\/it\/una-guida-per-applicare-lapply-sapply-e-tapply-in-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">qui<\/a> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Risorse addizionali<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">I seguenti tutorial offrono informazioni aggiuntive su come lavorare con le date in R:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/it\/formato-della-data\/\" target=\"_blank\" rel=\"noopener\">La guida completa ai formati di data in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/ordinare-per-data-in-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">Come ordinare un dataframe per data in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/estrarre-lanno-dalla-data-in-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">Come estrarre l&#8217;anno dalla data in R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Spesso quando importi dati di data e ora in R, i valori verranno importati come stringhe. Il modo pi\u00f9 semplice per convertire stringhe in date in R \u00e8 utilizzare la funzione as.Date() , che utilizza la seguente sintassi: like.Date(x, formato) Oro: x: un singolo valore stringa o un vettore di valori stringa. formato: il formato [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Come convertire stringhe in date in R (con esempi)<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come convertire stringhe in date in R, con diversi esempi.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Come convertire stringhe in date in R (con esempi)\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come convertire stringhe in date in R, con diversi esempi.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T09:13:26+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/\",\"url\":\"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/\",\"name\":\"Come convertire stringhe in date in R (con esempi)\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-27T09:13:26+00:00\",\"dateModified\":\"2023-07-27T09:13:26+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come convertire stringhe in date in R, con diversi esempi.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/convertire-le-stringhe-in-date-in-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Come convertire stringhe in date in r (con esempi)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/it\/#website\",\"url\":\"https:\/\/statorials.org\/it\/\",\"name\":\"Statorials\",\"description\":\"La tua guida all&#039;alfabetizzazione statistica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/it\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\",\"name\":\"Benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin anderson\"},\"description\":\"Ciao, sono Benjamin, un professore di statistica in pensione diventato insegnante dedicato di Statorials. 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