{"id":26858,"date":"2025-08-01T21:15:25","date_gmt":"2025-08-01T18:15:25","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-epoch-zaman-damgasini-tarihe-cevirme\/"},"modified":"2025-08-01T21:15:25","modified_gmt":"2025-08-01T18:15:25","slug":"postgresql-epoch-zaman-damgasini-tarihe-cevirme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-epoch-zaman-damgasini-tarihe-cevirme\/","title":{"rendered":"PostgreSQL: Epoch Zaman Damgas\u0131n\u0131 Tarihe \u00c7evirme"},"content":{"rendered":"<p># PostgreSQL&#8217;de Epoch Zaman Damgas\u0131n\u0131 Tarihe D\u00f6n\u00fc\u015ft\u00fcrme<\/p>\n<p><strong>Meta A\u00e7\u0131klamas\u0131:<\/strong> PostgreSQL veritaban\u0131n\u0131zda epoch zaman damgas\u0131n\u0131 tarih ve saate d\u00f6n\u00fc\u015ft\u00fcrmek mi istiyorsunuz? Bu kapsaml\u0131 rehber, yeni ba\u015flayanlardan uzmanlara kadar herkes i\u00e7in ad\u0131m ad\u0131m bir k\u0131lavuz sunuyor, ger\u00e7ek d\u00fcnya \u00f6rnekleri ve performans optimizasyonu ipu\u00e7lar\u0131yla dolu.  Epoch&#8217;ten tarih d\u00f6n\u00fc\u015f\u00fcm\u00fcn\u00fc PostgreSQL&#8217;de nas\u0131l kolayca ve verimli bir \u015fekilde yapabilece\u011finizi \u00f6\u011frenin.<\/p>\n<p>Veri analizi yaparken veya zaman serileriyle \u00e7al\u0131\u015f\u0131rken s\u0131kl\u0131kla kar\u015f\u0131la\u015ft\u0131\u011f\u0131m\u0131z bir durum, epoch zaman damgas\u0131yla ifade edilen tarihleri anla\u015f\u0131l\u0131r bir tarih ve saat format\u0131na d\u00f6n\u00fc\u015ft\u00fcrme ihtiyac\u0131d\u0131r.  Epoch zaman damgas\u0131, 1 Ocak 1970, 00:00:00 UTC&#8217;den bu yana ge\u00e7en saniyeleri temsil eder.  Bu makalede, PostgreSQL veritaban\u0131 sisteminde epoch zaman damgas\u0131n\u0131 tarih ve saate d\u00f6n\u00fc\u015ft\u00fcrmenin farkl\u0131 y\u00f6ntemlerini, performans optimizasyon tekniklerini ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ele alaca\u011f\u0131z.  Farkl\u0131 deneyim seviyelerine uygun bir \u00f6\u011frenme yolu sunarak, konuyu ad\u0131m ad\u0131m kavraman\u0131z\u0131 sa\u011flayaca\u011f\u0131z.<\/p>\n<p><strong>Epoch Zaman Damgas\u0131 ve PostgreSQL: Temel Kavramlar<\/strong><\/p>\n<p>Epoch zaman damgas\u0131, bilgisayar bilimlerinde zaman\u0131 temsil etmenin standart bir yoludur.  Unix tabanl\u0131 sistemlerde yayg\u0131n olarak kullan\u0131l\u0131r ve genellikle saniye cinsinden ifade edilir.  PostgreSQL, tarih ve saat verilerini saklamak i\u00e7in \u00e7e\u015fitli veri tipleri sunar ( <code class=\"language-\">timestamp<\/code>, <code class=\"language-\">timestamptz<\/code>, <code class=\"language-\">date<\/code> vb.).  Epoch zaman damgas\u0131n\u0131 bu veri tiplerine d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in PostgreSQL&#8217;in sundu\u011fu fonksiyonlar\u0131 kullan\u0131r\u0131z.  Bu fonksiyonlar, epoch de\u011ferini alarak kar\u015f\u0131l\u0131k gelen tarih ve saat bilgisini \u00fcretir.  Bu d\u00f6n\u00fc\u015f\u00fcm, zaman dilimlerinin do\u011fru bir \u015fekilde i\u015flenmesi gerekti\u011fi i\u00e7in \u00f6zellikle \u00f6nemlidir.  <code class=\"language-\">timestamptz<\/code> veri tipi, zaman dilimi bilgisini i\u00e7erirken, <code class=\"language-\">timestamp<\/code> veri tipi i\u00e7ermez.  Dolay\u0131s\u0131yla, epoch zaman damgas\u0131n\u0131 UTC zaman diliminde temsil eden bir <code class=\"language-\">timestamptz<\/code> de\u011feri elde etmek i\u00e7in do\u011fru fonksiyonu se\u00e7mek kritiktir.<\/p>\n<p><strong>PostgreSQL&#8217;de Epoch&#8217;u Tarihe D\u00f6n\u00fc\u015ft\u00fcrme: Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p><strong># Yeni Ba\u015flayanlar \u0130\u00e7in Ad\u0131m Ad\u0131m Anlat\u0131m:<\/strong><\/p>\n<p>Bir epoch zaman damgas\u0131n\u0131 PostgreSQL&#8217;de tarih ve saate d\u00f6n\u00fc\u015ft\u00fcrmenin en basit yolu <code class=\"language-\">to_timestamp()<\/code> fonksiyonunu kullanmakt\u0131r.  Bu fonksiyon, epoch zaman damgas\u0131n\u0131 (saniye cinsinden) al\u0131r ve <code class=\"language-\">timestamp with time zone<\/code> veri tipinde bir de\u011fer d\u00f6nd\u00fcr\u00fcr.<\/p>\n<pre class=\"language-sql\"><code>SELECT to_timestamp(1678886400); -- 15 Mart 2023, 00:00:00 UTC<\/code><\/pre>\n<p>Bu sorgu, 1678886400 epoch zaman damgas\u0131n\u0131 kar\u015f\u0131l\u0131k gelen tarih ve saate d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.  Sonu\u00e7, UTC zaman diliminde olacakt\u0131r.  E\u011fer farkl\u0131 bir zaman dilimine ihtiyac\u0131n\u0131z varsa, <code class=\"language-\">at time zone<\/code> ifadesini kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT to_timestamp(1678886400) AT TIME ZONE 'Europe\/Istanbul'; -- 15 Mart 2023, 03:00:00 Europe\/Istanbul<\/code><\/pre>\n<p>Bu sorgu, ayn\u0131 epoch zaman damgas\u0131n\u0131 \u0130stanbul zaman dilimine g\u00f6re d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.<\/p>\n<p><strong># Orta Seviye: Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>\u015eimdi, bir e-ticaret sitesinin g\u00fcnl\u00fck sat\u0131\u015f verilerini i\u00e7eren bir tablo \u00fczerinde \u00e7al\u0131\u015ft\u0131\u011f\u0131m\u0131z\u0131 d\u00fc\u015f\u00fcnelim.  Sat\u0131\u015flar\u0131n epoch zaman damgas\u0131 ile kaydedildi\u011fini varsayal\u0131m.  Bu verileri tarih ve saate g\u00f6re analiz etmek i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT \n    to_timestamp(epoch_timestamp) AS sales_datetime,\n    SUM(sales_amount) AS total_sales\nFROM \n    sales_data\nGROUP BY \n    sales_datetime\nORDER BY \n    sales_datetime;<\/code><\/pre>\n<p>Burada <code class=\"language-\">epoch_timestamp<\/code> s\u00fctunu, epoch zaman damgas\u0131n\u0131 tutar.  <code class=\"language-\">to_timestamp()<\/code> fonksiyonu her sat\u0131r i\u00e7in \u00e7a\u011fr\u0131l\u0131r ve sonu\u00e7lar tarih ve saate g\u00f6re grupland\u0131r\u0131l\u0131r.  Veri setiniz b\u00fcy\u00fckse, bu sorgu performans sorunlar\u0131na yol a\u00e7abilir.  Performans\u0131 iyile\u015ftirmek i\u00e7in, bir indeks olu\u015fturmay\u0131 d\u00fc\u015f\u00fcnebilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_sales_data_epoch ON sales_data (epoch_timestamp);<\/code><\/pre>\n<p>Bu indeks, <code class=\"language-\">epoch_timestamp<\/code> s\u00fctunu \u00fczerinde bir indeks olu\u015fturarak, sorguyu daha h\u0131zl\u0131 hale getirir.  Ayr\u0131ca, b\u00fcy\u00fck veri setlerinde <code class=\"language-\">to_timestamp()<\/code> fonksiyonunun performans\u0131n\u0131 iyile\u015ftirmek i\u00e7in,  fonksiyonu \u00f6nceden hesaplay\u0131p bir ge\u00e7ici tabloya kaydedebilirsiniz.<\/p>\n<p><strong># \u0130leri D\u00fczey: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck veri setlerinde, epoch&#8217;tan tarih d\u00f6n\u00fc\u015f\u00fcm\u00fcn\u00fcn performans\u0131 kritik hale gelir.  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu, sorgu y\u00fcr\u00fctme plan\u0131n\u0131 ve performans istatistiklerini analiz etmek i\u00e7in kullan\u0131labilir.  Bu, darbo\u011fazlar\u0131 belirlemenize ve optimizasyon stratejileri geli\u015ftirmenize yard\u0131mc\u0131 olur.  \u00d6rne\u011fin, yukar\u0131daki sorgu i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu \u00e7al\u0131\u015ft\u0131rabilir ve sonu\u00e7lar\u0131 inceleyebilirsiniz.<\/p>\n<p><code class=\"language-\">to_timestamp()<\/code> fonksiyonu, ge\u00e7ersiz epoch de\u011ferleri ile kar\u015f\u0131la\u015fabilir.  Bu durumlar\u0131 ele almak i\u00e7in, <code class=\"language-\">CASE<\/code> ifadesi veya hata yakalama mekanizmalar\u0131 kullanabilirsiniz. \u00d6rne\u011fin, negatif epoch de\u011ferleri veya \u00e7ok b\u00fcy\u00fck de\u011ferler i\u00e7in \u00f6zel bir i\u015flem uygulayabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT \n    CASE \n        WHEN epoch_timestamp &gt;= 0 THEN to_timestamp(epoch_timestamp)\n        ELSE NULL -- veya ba\u015fka bir uygun de\u011fer\n    END AS sales_datetime,\n    SUM(sales_amount) AS total_sales\nFROM \n    sales_data\nGROUP BY \n    sales_datetime\nORDER BY \n    sales_datetime;<\/code><\/pre>\n<p>Bu, negatif epoch de\u011ferlerini NULL olarak i\u015fler.  Daha karma\u015f\u0131k hata y\u00f6netimi i\u00e7in, PostgreSQL&#8217;in hata yakalama mekanizmalar\u0131n\u0131 kullanabilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Tarih ve Saat \u0130\u015flemleri: \u0130leri Teknikler<\/strong><\/p>\n<p>PostgreSQL, tarih ve saatlerle ilgili bir\u00e7ok ileri d\u00fczey fonksiyon sunar.  <code class=\"language-\">date_part()<\/code>, <code class=\"language-\">extract()<\/code>, <code class=\"language-\">age()<\/code> gibi fonksiyonlar, tarih ve saat verilerinden belirli par\u00e7alar\u0131 ay\u0131klamak, tarih farklar\u0131n\u0131 hesaplamak ve di\u011fer i\u015flemleri ger\u00e7ekle\u015ftirmek i\u00e7in kullan\u0131labilir.  Bu fonksiyonlar, epoch zaman damgas\u0131ndan elde edilen tarih ve saat verileri \u00fczerinde daha detayl\u0131 analizler yapman\u0131z\u0131 sa\u011flar. \u00d6rne\u011fin, bir sipari\u015fin ne kadar s\u00fcre \u00f6nce verildi\u011fini hesaplamak i\u00e7in <code class=\"language-\">age()<\/code> fonksiyonunu kullanabilirsiniz.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131: Vaka \u00c7al\u0131\u015fmalar\u0131<\/strong><\/p>\n<p><strong>Vaka 1:<\/strong>  Bir web sunucusunun log dosyalar\u0131n\u0131 analiz etmek ve g\u00fcnl\u00fck istek say\u0131s\u0131n\u0131 hesaplamak istiyoruz. Log dosyalar\u0131nda zaman damgas\u0131 epoch olarak kaydedilmi\u015ftir.  <code class=\"language-\">to_timestamp()<\/code> ve <code class=\"language-\">date_trunc()<\/code> fonksiyonlar\u0131n\u0131 kullanarak g\u00fcnl\u00fck istekleri toplayabiliriz.<\/p>\n<p><strong>Vaka 2:<\/strong>  Bir sosyal medya platformunda, kullan\u0131c\u0131lar\u0131n aktivitelerini analiz etmek ve g\u00fcnl\u00fck aktif kullan\u0131c\u0131 say\u0131s\u0131n\u0131 hesaplamak istiyoruz.  Kullan\u0131c\u0131 aktiviteleri epoch zaman damgas\u0131 ile kaydedilmi\u015ftir.  <code class=\"language-\">to_timestamp()<\/code>, <code class=\"language-\">date_trunc()<\/code> ve <code class=\"language-\">COUNT(DISTINCT)<\/code> fonksiyonlar\u0131n\u0131 kullanarak g\u00fcnl\u00fck aktif kullan\u0131c\u0131 say\u0131s\u0131n\u0131 hesaplayabiliriz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makalede, PostgreSQL&#8217;de epoch zaman damgas\u0131n\u0131 tarih ve saate d\u00f6n\u00fc\u015ft\u00fcrmenin farkl\u0131 y\u00f6ntemlerini, performans optimizasyon tekniklerini ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ele ald\u0131k.  Farkl\u0131 deneyim seviyelerine uygun bir \u00f6\u011frenme yolu sunarak, konuyu ad\u0131m ad\u0131m kavraman\u0131z\u0131 sa\u011flad\u0131k.  Epoch zaman damgas\u0131yla \u00e7al\u0131\u015f\u0131rken, zaman dilimlerinin do\u011fru bir \u015fekilde i\u015flenmesi ve performans optimizasyonunun \u00f6nemini unutmamak \u00f6nemlidir.  Daha detayl\u0131 bilgi ve ileri teknikler i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com) adresini ziyaret edebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">to_timestamp()<\/code> fonksiyonu hangi zaman dilimini varsay\u0131yor?<\/strong>  <code class=\"language-\">to_timestamp()<\/code> fonksiyonu varsay\u0131lan olarak UTC zaman dilimini kullan\u0131r.<\/p>\n<p>2. <strong>Farkl\u0131 zaman dilimlerine nas\u0131l d\u00f6n\u00fc\u015f\u00fcm yapabilirim?<\/strong> <code class=\"language-\">AT TIME ZONE<\/code> ifadesini kullanarak farkl\u0131 zaman dilimlerine d\u00f6n\u00fc\u015f\u00fcm yapabilirsiniz.<\/p>\n<p>3. <strong>B\u00fcy\u00fck veri setlerinde performans\u0131 nas\u0131l iyile\u015ftirebilirim?<\/strong> \u0130ndeks olu\u015fturma, ge\u00e7ici tablolar kullanma ve sorgu optimizasyonu tekniklerini kullanabilirsiniz.<\/p>\n<p>4. <strong>Ge\u00e7ersiz epoch de\u011ferleri nas\u0131l ele al\u0131n\u0131r?<\/strong> <code class=\"language-\">CASE<\/code> ifadesi veya hata yakalama mekanizmalar\u0131 kullan\u0131labilir.<\/p>\n<p>5. <strong>PostgreSQL&#8217;de tarih ve saat i\u015flemleri i\u00e7in ba\u015fka hangi fonksiyonlar kullan\u0131labilir?<\/strong> <code class=\"language-\">date_part()<\/code>, <code class=\"language-\">extract()<\/code>, <code class=\"language-\">age()<\/code> gibi bir\u00e7ok fonksiyon kullan\u0131labilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Epoch Zaman Damgas\u0131n\u0131 Tarihe D\u00f6n\u00fc\u015ft\u00fcrme Meta A\u00e7\u0131klamas\u0131: PostgreSQL veritaban\u0131n\u0131zda epoch zaman damgas\u0131n\u0131 tarih ve saate d\u00f6n\u00fc\u015ft\u00fcrmek&hellip;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[644],"tags":[],"class_list":{"0":"post-26858","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-postgresql","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - 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