{"id":2901,"date":"2023-07-20T04:29:07","date_gmt":"2023-07-20T04:29:07","guid":{"rendered":"https:\/\/statorials.org\/pt\/strptime-strftime-r\/"},"modified":"2023-07-20T04:29:07","modified_gmt":"2023-07-20T04:29:07","slug":"strptime-strftime-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/strptime-strftime-r\/","title":{"rendered":"Como usar as fun\u00e7\u00f5es strptime e strftime em r"},"content":{"rendered":"

<\/p>\n

\n

Voc\u00ea pode usar as fun\u00e7\u00f5es strptime<\/strong> e strftime<\/strong> em R para converter entre objetos de caractere e tempo.<\/span><\/p>\n

A fun\u00e7\u00e3o strptime<\/strong> converte caracteres em objetos de hora e usa a seguinte sintaxe b\u00e1sica:<\/span><\/p>\n

 strptime(character_object, format=\" %Y-%m-%d<\/span> \")<\/span><\/span><\/strong><\/pre>\n
 A fun\u00e7\u00e3o strftime<\/strong> converte objetos de hora em caracteres e usa a seguinte sintaxe b\u00e1sica:<\/span><\/p>\n
 strftime(time_object)<\/span><\/span><\/strong><\/pre>\n
 Os exemplos a seguir mostram como usar cada fun\u00e7\u00e3o na pr\u00e1tica.<\/span><\/p>\n
 Exemplo 1: Use a fun\u00e7\u00e3o strptime em R<\/strong><\/span><\/h3>\n
 Suponha que temos o seguinte vetor de caracteres em R:<\/span><\/p>\n
 #create character vector\n<\/span>char_data <- c(\"2022-01-01\", \"2022-01-25\", \"2022-02-14\", \"2022-03-19\")\n\n#view class of vector\n<\/span>class(char_data)\n\n[1] \u201ccharacter\u201d\n<\/span><\/span><\/strong><\/pre>\n
 Podemos usar a fun\u00e7\u00e3o strptime<\/strong> para converter caracteres em objetos de tempo:<\/span><\/p>\n
 #convert characters to time objects\n<\/span>time_data <- strptime(char_data, format=\" %Y-%m-%d<\/span> \")\n\n#view new vector\n<\/span>time_data\n\n[1] \"2022-01-01 UTC\" \"2022-01-25 UTC\" \"2022-02-14 UTC\" \"2022-03-19 UTC\"\n\n#view class of new vector\n<\/span>class(time_data)\n\n[1] \u201cPOSIXlt\u201d \u201cPOSIXt\u201d\n<\/span><\/span><\/strong><\/pre>\n
 Pode-se observar que os personagens foram convertidos em objetos temporais.<\/span><\/p>\n
 Observe que tamb\u00e9m podemos usar o argumento tz<\/strong> para converter caracteres em objetos de hora com um fuso hor\u00e1rio espec\u00edfico.<\/span><\/p>\n
 Por exemplo, poder\u00edamos especificar “EST” para converter caracteres em objetos de hora no fuso hor\u00e1rio do Leste:<\/span><\/p>\n
 #convert characters to time objects in EST time zone\n<\/span>time_data <- strptime(char_data, format=\" %Y-%m-%d<\/span> \", tz=\" IS<\/span> \")\n\n#view new vector\n<\/span>time_data\n\n[1] \"2022-01-01 EST\" \"2022-01-25 EST\" \"2022-02-14 EST\" \"2022-03-19 EST\"\n<\/span><\/span><\/strong><\/pre>\n
 Observe que cada um dos objetos de hor\u00e1rio agora termina em EST<\/strong> , o que indica um fuso hor\u00e1rio do Leste.<\/span><\/p>\n
 Exemplo 2: Use a fun\u00e7\u00e3o strftime em R<\/strong><\/span><\/h3>\n
 Suponha que temos o seguinte vetor de objetos temporais em R:<\/span><\/p>\n
 #create vector of time objects\n<\/span>time_data <- as. POSIXct<\/span> (c(\"2022-01-01\", \"2022-01-25\", \"2022-02-14\"))\n\n#view class of vector\n<\/span>class(time_data)\n\n[1] \u201cPOSIXct\u201d \u201cPOSIXt\u201d\n<\/span><\/span><\/strong><\/pre>\n
 Podemos usar a fun\u00e7\u00e3o strftime<\/strong> para converter objetos de tempo em caracteres:<\/span><\/p>\n
 #convert time objects to characters\n<\/span>char_data <- strftime(time_data)\n\n#view new vector\n<\/span>char_data\n\n[1] \"2022-01-01\" \"2022-01-25\" \"2022-02-14\"\n\n#view class of new vector\n<\/span>class(char_data)\n\n[1] \u201ccharacter\u201d\n<\/span><\/span><\/strong><\/pre>\n
 Vemos que os objetos temporais foram convertidos em personagens.<\/span><\/p>\n
 Recursos adicionais<\/strong><\/span><\/h3>\n
 Os tutoriais a seguir explicam como usar outras fun\u00e7\u00f5es comuns em R:<\/span><\/p>\n
 Como usar a fun\u00e7\u00e3o tabulate() em R<\/a>
 Como usar a fun\u00e7\u00e3o split() em R<\/a>
 Como usar a fun\u00e7\u00e3o match() em R<\/a>
 Como usar a fun\u00e7\u00e3o replicate() em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Voc\u00ea pode usar as fun\u00e7\u00f5es strptime e strftime em R para converter entre objetos de caractere e tempo. A fun\u00e7\u00e3o strptime converte caracteres em objetos de hora e usa a seguinte sintaxe b\u00e1sica: strptime(character_object, format=” %Y-%m-%d “) A fun\u00e7\u00e3o strftime converte objetos de hora em caracteres e usa a seguinte sintaxe b\u00e1sica: strftime(time_object) Os exemplos […]<\/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":[],"class_list":["post-2901","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"\nComo usar as fun\u00e7\u00f5es strptime e strftime em R - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como usar as fun\u00e7\u00f5es strptime e strftime em R, com v\u00e1rios exemplos.\" \/>\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\/pt\/strptime-strftime-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como usar as fun\u00e7\u00f5es strptime e strftime em R - Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como usar as fun\u00e7\u00f5es strptime e strftime em R, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/strptime-strftime-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-20T04:29:07+00:00\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/strptime-strftime-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/strptime-strftime-r\/\",\"name\":\"Como usar as fun\u00e7\u00f5es strptime e strftime em R - Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-20T04:29:07+00:00\",\"dateModified\":\"2023-07-20T04:29:07+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como usar as fun\u00e7\u00f5es strptime e strftime em R, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/strptime-strftime-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/strptime-strftime-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/strptime-strftime-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como usar as fun\u00e7\u00f5es strptime e strftime em r\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. 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