{"id":2522,"date":"2025-03-20T19:53:02","date_gmt":"2025-03-20T12:53:02","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=2522"},"modified":"2025-04-02T15:30:32","modified_gmt":"2025-04-02T08:30:32","slug":"postgresql-justify_days","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-date-functions\/postgresql-justify_days\/","title":{"rendered":"PostgreSQL JUSTIFY_DAYS Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: In this tutorial, you&#8217;ll learn how to adjust an interval using the PostgreSQL&nbsp;<code>JUSTIFY_DAYS<\/code>&nbsp;function.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"postgresql-justify_days-function-overview\" id='postgresqljustify_daysfunction-overview'>PostgreSQL&nbsp;JUSTIFY_DAYS&nbsp;Function Overview <a href=\"#postgresqljustify_daysfunction-overview\" class=\"anchor\" id=\"postgresqljustify_daysfunction-overview\" title=\"Anchor for PostgreSQL&nbsp;JUSTIFY_DAYS&nbsp;Function Overview\">#<\/a><\/h2>\n\n\n\n<p>The\u00a0<code>JUSTIFY_DAYS()<\/code>\u00a0function allows you to adjust an <a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-interval-data-type\/\">interval<\/a> by converting days exceeding 30 into months.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>JUSTIFY_DAYS<\/code> 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_DAYS (<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_DAYS<\/code>&nbsp;function accepts a value with the type of&nbsp;<code>INTERVAL<\/code>&nbsp;you want to adjust.<\/p>\n\n\n\n<p>The&nbsp;<code>JUSTIFY_DAYS<\/code>&nbsp;function returns the adjusted interval by doing the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Converting days exceeding 30 to months.<\/li>\n\n\n\n<li>Adding the remaining days.<\/li>\n\n\n\n<li>Keeping hours, minutes, and seconds the same.<\/li>\n<\/ul>\n\n\n\n<p>The&nbsp;<code>JUSTIFY_DAYS<\/code>&nbsp;function returns&nbsp;<code>NULL<\/code>&nbsp;if the value is&nbsp;<code>NULL<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"postgresql-justify_days-function-example\" id='postgresqljustify_daysfunction-example'>PostgreSQL&nbsp;JUSTIFY_DAYS()&nbsp;Function Example <a href=\"#postgresqljustify_daysfunction-example\" class=\"anchor\" id=\"postgresqljustify_daysfunction-example\" title=\"Anchor for PostgreSQL&nbsp;JUSTIFY_DAYS()&nbsp;Function Example\">#<\/a><\/h2>\n\n\n\n<p>The following example uses the&nbsp;<code>JUSTIFY_DAYS()<\/code>&nbsp;function to adjust intervals:<\/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_DAYS(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'31 days'<\/span>) interval1,\n    JUSTIFY_DAYS(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'62 days'<\/span>) interval2,\n    JUSTIFY_DAYS(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'93 days'<\/span>) interval3;<\/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>Output:<\/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\">-&#91; RECORD 1 ]------------\ninterval1 | 1 mon 1 day\ninterval2 | 2 mons 2 days\ninterval3 | 3 mons 3 days<\/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<p>In this example, the&nbsp;<code>JUSTIFY_DAYS<\/code>&nbsp;function converts:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An interval of 31 days to 1 month and 1 day.<\/li>\n\n\n\n<li>An interval of 62 days to 2 months and 2 days.<\/li>\n\n\n\n<li>An interval of 93 days to 3 months and 3 days.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"converting-an-interval-that-includes-hours-and-minutes\" id='converting-intervals-that-include-hours-minutes-and-seconds'>Converting Intervals That Include Hours, Minutes, and Seconds <a href=\"#converting-intervals-that-include-hours-minutes-and-seconds\" class=\"anchor\" id=\"converting-intervals-that-include-hours-minutes-and-seconds\" title=\"Anchor for Converting Intervals That Include Hours, Minutes, and Seconds\">#<\/a><\/h2>\n\n\n\n<p>The following statement uses the&nbsp;<code>JUSTIFY_DAYS<\/code>&nbsp;function to adjust intervals that include hours, minutes, and seconds:<\/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_DAYS(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'10 days 3 hours'<\/span>) interval1,\n    JUSTIFY_DAYS(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'35 days 15 minutes'<\/span>) interval2,\n    JUSTIFY_DAYS(<span class=\"hljs-type\">INTERVAL<\/span> <span class=\"hljs-string\">'90 days 29 seconds'<\/span>) interval3;<\/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>Output:<\/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\">-&#91; RECORD 1 ]--------------------\ninterval1 | 10 days 03:00:00\ninterval2 | 1 mon 5 days 00:15:00\ninterval3 | 3 mons 00:00:29<\/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<p>Note that the&nbsp;<code>JUSTIFY_DAYS<\/code>&nbsp;does not change the hours, minutes, and seconds.<\/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&nbsp;<code>JUSTIFY_DAYS<\/code>&nbsp;function to adjust an interval by converting days that exceed 30 days into months.<\/li>\n<\/ul>\n\n\n\n<h2 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