{"id":2333,"date":"2023-07-22T17:53:51","date_gmt":"2023-07-22T17:53:51","guid":{"rendered":"https:\/\/statorials.org\/nl\/r-datumformaat\/"},"modified":"2023-07-22T17:53:51","modified_gmt":"2023-07-22T17:53:51","slug":"r-datumformaat","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/r-datumformaat\/","title":{"rendered":"De complete gids voor datumformaten in r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">De volgende tabel toont een verscheidenheid aan symbolen die u kunt gebruiken om datums in R op te maken:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<th style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>Symbool<\/strong><\/span><\/th>\n<th style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>Definitie<\/strong><\/span><\/th>\n<th style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>Voorbeeld<\/strong><\/span><\/th>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>%D<\/strong><\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Dag als getal<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">19<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>%HEEFT<\/strong><\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Verkort weekendje<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Zon<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\"><b>%HEEFT<\/b><\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Onverkort weekend<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Zondag<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>%M<\/strong><\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Maand als getal<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">04<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>%B<\/strong><\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Afgekorte maand<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">februari<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>%B<\/strong><\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Niet-afgekorte maand<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">FEBRUARI<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>%y<\/strong><\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Jaartal van 2 cijfers<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">14<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>%J<\/strong><\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">Jaartal van 4 cijfers<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">2014<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p> <span style=\"color: #000000;\">De volgende voorbeelden laten zien hoe u elk van deze formaten in de praktijk kunt gebruiken.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 1: Formatteer de datum met dag, maand en jaar<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u een datum kunt opmaken met de notatie maand\/dag\/jaar:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define date\n<\/span>date &lt;- as. <span style=\"color: #3366ff;\">Date<\/span> (\" <span style=\"color: #ff0000;\">2021-01-25<\/span> \")\n\n<span style=\"color: #008080;\">#date format\n<\/span>formatted_date &lt;- format(date, format=\" <span style=\"color: #ff0000;\">%m\/%d\/%y<\/span> \")\n\n<span style=\"color: #008080;\">#display formatted date\n<\/span>formatted_date\n\n[1] \"01\/25\/21\"<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Merk op dat we tussen elke waarde alle gewenste scheidingstekens kunnen gebruiken.<\/span><\/p>\n<p> <span style=\"color: #000000;\">We kunnen in plaats daarvan bijvoorbeeld koppeltekens gebruiken:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define date\n<\/span>date &lt;- as. <span style=\"color: #3366ff;\">Date<\/span> (\" <span style=\"color: #ff0000;\">2021-01-25<\/span> \")\n\n<span style=\"color: #008080;\">#date format\n<\/span>formatted_date &lt;- format(date, format=\" <span style=\"color: #ff0000;\">%m-%d-%y<\/span> \")\n\n<span style=\"color: #008080;\">#display formatted date\n<\/span>formatted_date\n\n[1] \"01-25-21\"<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 2: Formatteer de datum als dag van de week<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u een datum kunt opmaken met behulp van een dag van de weeknotatie:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define date\n<\/span>date &lt;- as. <span style=\"color: #3366ff;\">Date<\/span> (\" <span style=\"color: #ff0000;\">2021-01-25<\/span> \")\n\n<span style=\"color: #008080;\">#format date as abbreviated weekday\n<\/span>format(date, format=\" <span style=\"color: #ff0000;\">%a<\/span> \")\n\n[1] \u201cMy\u201d\n\n<span style=\"color: #008080;\">#format date as unabbreviated weekday\n<\/span>format(date, format=\" <span style=\"color: #ff0000;\">%A<\/span> \")\n\n[1] \u201cMonday\u201d\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 3: Formatteer de datum in maanden<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u een datum als maand kunt opmaken:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define date\n<\/span>date &lt;- as. <span style=\"color: #3366ff;\">Date<\/span> (\" <span style=\"color: #ff0000;\">2021-01-25<\/span> \")\n\n<span style=\"color: #008080;\">#format date as abbreviated month\n<\/span>format(date, format=\" <span style=\"color: #ff0000;\">%b<\/span> \")\n\n[1] \u201cJan\u201d\n\n<span style=\"color: #008080;\">#format date as unabbreviated month\n<\/span>format(date, format=\" <span style=\"color: #ff0000;\">%B<\/span> \")\n\n[1] \u201cJanuary\u201d<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">We kunnen de datum ook opmaken in maand en dag:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define date\n<\/span>date &lt;- as. <span style=\"color: #3366ff;\">Date<\/span> (\" <span style=\"color: #ff0000;\">2021-01-25<\/span> \")\n\n<span style=\"color: #008080;\">#format date as abbreviated month\n<\/span>format(date, format=\" <span style=\"color: #ff0000;\">%b %d<\/span> \")\n\n[1] \u201cJan 25\u201d<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">In de volgende tutorials wordt uitgelegd hoe u andere veelvoorkomende bewerkingen met datums in R kunt uitvoeren:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/nl\/sorteer-op-datum-in-r\/\" target=\"_blank\" rel=\"noopener\">Hoe een dataframe op datum te sorteren in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/subset-op-datumbereik-in-r\/\" target=\"_blank\" rel=\"noopener\">Subdefini\u00ebren op basis van een datumbereik in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/converteer-tekenreeksen-naar-datums-in-r\/\" target=\"_blank\" rel=\"noopener\">Hoe tekenreeksen naar datums in R te converteren<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>De volgende tabel toont een verscheidenheid aan symbolen die u kunt gebruiken om datums in R op te maken: Symbool Definitie Voorbeeld %D Dag als getal 19 %HEEFT Verkort weekendje Zon %HEEFT Onverkort weekend Zondag %M Maand als getal 04 %B Afgekorte maand februari %B Niet-afgekorte maand FEBRUARI %y Jaartal van 2 cijfers 14 %J [&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":[],"class_list":["post-2333","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - 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