{"id":2535,"date":"2025-03-21T09:08:48","date_gmt":"2025-03-21T02:08:48","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=2535"},"modified":"2025-04-02T15:30:51","modified_gmt":"2025-04-02T08:30:51","slug":"postgresql-justify_interval","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-date-functions\/postgresql-justify_interval\/","title":{"rendered":"PostgreSQL JUSTIFY_INTERVAL Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: In this tutorial, you&#8217;ll learn how to adjust an interval using the PostgreSQL <code>JUSTIFY_INTERVAL<\/code> function.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"postgresql-justify_interval-function-overview\" id='postgresqljustify_intervalfunction-overview'>PostgreSQL&nbsp;JUSTIFY_INTERVAL&nbsp;Function Overview <a href=\"#postgresqljustify_intervalfunction-overview\" class=\"anchor\" id=\"postgresqljustify_intervalfunction-overview\" title=\"Anchor for PostgreSQL&nbsp;JUSTIFY_INTERVAL&nbsp;Function Overview\">#<\/a><\/h2>\n\n\n\n<p>The\u00a0<code>JUSTIFY_INTERVAL<\/code>\u00a0allows you to adjust an <a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-interval-data-type\/\">interval<\/a> by converting hours to days and days to months.<\/p>\n\n\n\n<p>It utilizes the&nbsp;<code><a href=\"https:\/\/www.pgtutorial.com\/postgresql-date-functions\/postgresql-justify_days\/\">JUSTIFY_DAYS()<\/a><\/code>&nbsp;and&nbsp;<code><a href=\"https:\/\/www.pgtutorial.com\/postgresql-date-functions\/postgresql-justify_hours\/\">JUSTIFY_HOURS()<\/a><\/code>&nbsp;functions with additional sign adjustments.<\/p>\n\n\n\n<p>The following shows the syntax of the&nbsp;<code>JUSTIFY_INTERVAL<\/code>&nbsp;function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">JUSTIFY_INTERVAL(<span class=\"hljs-keyword\">value<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The&nbsp;<code>JUSTIFY_INTERVAL<\/code>&nbsp;function accepts one parameter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>value<\/code>&nbsp;is the interval you want to adjust.<\/li>\n<\/ul>\n\n\n\n<p>The&nbsp;<code>JUSTIFY_INTERVAL<\/code>&nbsp;function returns a new interval with the days and hours adjusted accordingly.<\/p>\n\n\n\n<p>The&nbsp;<code>JUSTIFY_INTERVAL<\/code>&nbsp;function returns&nbsp;<code>NULL<\/code>&nbsp;if the input interval is&nbsp;<code>NULL<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"adjusting-days-to-months\" id='adjusting-days-to-months'>Adjusting Days to Months <a href=\"#adjusting-days-to-months\" class=\"anchor\" id=\"adjusting-days-to-months\" title=\"Anchor for Adjusting Days to Months\">#<\/a><\/h2>\n\n\n\n<p>The following statement uses the&nbsp;<code>JUSTIFY_INTERVAL<\/code>&nbsp;function to adjust days to months:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  JUSTIFY_INTERVAL(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'31 days'<\/span>) result;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIEpVU1RJRllfSU5URVJWQUwoSU5URVJWQUwgJzMxIGRheXMnKSByZXN1bHQ7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output<strong>:<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">    result\n-------------\n 1 mon 1 day<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id=\"adjusting-hours-to-days\" id='adjusting-hours-to-days'>Adjusting Hours to Days <a href=\"#adjusting-hours-to-days\" class=\"anchor\" id=\"adjusting-hours-to-days\" title=\"Anchor for Adjusting Hours to Days\">#<\/a><\/h2>\n\n\n\n<p>The following example uses the&nbsp;<code>JUSTIFY_INTERVAL<\/code>&nbsp;function to adjust hours to days:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  JUSTIFY_INTERVAL(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'25 hours'<\/span>) result;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIEpVU1RJRllfSU5URVJWQUwoSU5URVJWQUwgJzI1IGhvdXJzJykgcmVzdWx0Ow%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output<strong>:<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">      result\n----------------\n 1 day 01:00:00<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id=\"adjusting-both-days-to-months-and-hours-to-days\" id='adjusting-both-days-to-months-and-hours-to-days'>Adjusting Both Days to Months and Hours to Days <a href=\"#adjusting-both-days-to-months-and-hours-to-days\" class=\"anchor\" id=\"adjusting-both-days-to-months-and-hours-to-days\" title=\"Anchor for Adjusting Both Days to Months and Hours to Days\">#<\/a><\/h2>\n\n\n\n<p>The following statement uses the&nbsp;<code>JUSTIFY_INTERVAL<\/code>&nbsp;function to adjust an interval that includes both days and hours:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  JUSTIFY_INTERVAL(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'31 days 25 hours'<\/span>) result;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIEpVU1RJRllfSU5URVJWQUwoSU5URVJWQUwgJzMxIGRheXMgMjUgaG91cnMnKSByZXN1bHQ7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">          result\n-----------------------\n 1 mon 2 days 01:00:00<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id=\"adjusting-intervals-with-additional-signs\" id='adjusting-intervals-with-negative-signs'>Adjusting Intervals with Negative Signs <a href=\"#adjusting-intervals-with-negative-signs\" class=\"anchor\" id=\"adjusting-intervals-with-negative-signs\" title=\"Anchor for Adjusting Intervals with Negative Signs\">#<\/a><\/h2>\n\n\n\n<p>The following statement uses the&nbsp;<code>JUSTIFY_INTERVAL()<\/code>&nbsp;function to adjust an interval with negative hours:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  JUSTIFY_INTERVAL(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'32 days -25 hours'<\/span>) result;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIEpVU1RJRllfSU5URVJWQUwoSU5URVJWQUwgJzMyIGRheXMgLTI1IGhvdXJzJykgcmVzdWx0Ow%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">      result\n----------------\n 1 mon 23:00:00<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The function normalizes the&nbsp;<code>32 days -25 hours<\/code>&nbsp;interval in the following steps:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>32 days - (1 day + 1 hour) = 31 days - 1 hour<\/code><\/li>\n\n\n\n<li><code>31 days = 1 mon + 1 day<\/code><\/li>\n\n\n\n<li><code>1 day - 1 hour = 23:00:00<\/code><\/li>\n<\/ol>\n\n\n\n<p>The final result is an interval&nbsp;<code>1 mon 23:00:00<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"summary\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the PostgreSQL&nbsp;<code>JUSTIFY_INTERVAL<\/code>&nbsp;function to adjust an interval by converting hours to days and days to months.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='quiz'>Quiz <a href=\"#quiz\" class=\"anchor\" id=\"quiz\" title=\"Anchor for Quiz\">#<\/a><\/h2>\n\n\n\n<iframe loading=\"lazy\"\n  name=\"quiz\"\n  src=\"\/quiz\/?quiz=justify_interval\"\n  height=\"700\"\n  width=\"600\"\n  class=\"iframe\"\n><\/iframe>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful ?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"2535\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-date-functions\/postgresql-justify_interval\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL JUSTIFY_INTERVAL Function\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 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PostgreSQL&nbsp;JUSTIFY_INTERVAL&nbsp;Function Overview # The\u00a0JUSTIFY_INTERVAL\u00a0allows you to adjust an interval by converting hours to days and days to months. It utilizes the&nbsp;JUSTIFY_DAYS()&nbsp;and&nbsp;JUSTIFY_HOURS()&nbsp;functions with additional sign adjustments. The following shows the syntax of the&nbsp;JUSTIFY_INTERVAL&nbsp;function: The&nbsp;JUSTIFY_INTERVAL&nbsp;function accepts one parameter: The&nbsp;JUSTIFY_INTERVAL&nbsp;function returns a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2440,"menu_order":12,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2535","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PostgreSQL JUSTIFY_INTERVAL Function<\/title>\n<meta name=\"description\" content=\"In this tutorial, you&#039;ll learn how to adjust an interval using the PostgreSQL\u00a0JUSTIFY_INTERVAL\u00a0function.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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