{"id":1416,"date":"2019-02-27T11:25:15","date_gmt":"2019-02-27T04:25:15","guid":{"rendered":"http:\/\/www.sqlservertutorial.net\/?page_id=1416"},"modified":"2020-04-11T20:12:43","modified_gmt":"2020-04-11T13:12:43","slug":"sql-server-datediff-function","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-date-functions\/sql-server-datediff-function\/","title":{"rendered":"SQL Server DATEDIFF Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use SQL Server <code>DATEDIFF()<\/code> function to calculate the number of years, months, weeks, days,etc., between two dates.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-datediff-overview'>SQL Server DATEDIFF() overview <a href=\"#sql-server-datediff-overview\" class=\"anchor\" id=\"sql-server-datediff-overview\" title=\"Anchor for SQL Server &lt;code&gt;DATEDIFF()&lt;\/code&gt; overview\">#<\/a><\/h2>\n\n\n\n<p>To calculate the difference between two dates in years, months, weeks, etc., you use the <code>DATEDIFF()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">DATEDIFF( date_part , start_date , end_date)\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code>DATEDIFF()<\/code> function accepts three arguments: <code>date_part<\/code>, <code>start_date<\/code>, and <code>end_date<\/code>.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>date_part<\/code> is the part of date e.g., a year, a quarter, a month, a week that you want to compare between the <code>start_date<\/code> and <code>end_date<\/code>. See the valid date parts in the table below.<\/li><li><code>start_date<\/code> and <code>end_date<\/code> are the dates to be compared. They must be resolved to values of type <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-date\/\">DATE<\/a><\/code>, <code>DATETIME<\/code>, <code>DATETIMEOFFSET<\/code>, <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-datetime2\/\">DATETIME2<\/a><\/code>, <code>SMALLATETIME<\/code>, or <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-time\/\">TIME<\/a><\/code>.<\/li><\/ul>\n\n\n\n<p>The following table lists the valid values of <code>date_part<\/code>:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"\"><thead><tr><th><em>date_part<\/em><\/th><th>abbreviations<\/th><\/tr><\/thead><tbody><tr><td>year<\/td><td>yy, yyyy<\/td><\/tr><tr><td>quarter<\/td><td>qq, q<\/td><\/tr><tr><td>month<\/td><td>mm, m<\/td><\/tr><tr><td>dayofyear<\/td><td>dy, y<\/td><\/tr><tr><td>day<\/td><td>dd, d<\/td><\/tr><tr><td>week<\/td><td>wk, ww<\/td><\/tr><tr><td>hour<\/td><td>hh<\/td><\/tr><tr><td>minute<\/td><td>mi, n<\/td><\/tr><tr><td>second<\/td><td>ss, s<\/td><\/tr><tr><td>millisecond<\/td><td>ms<\/td><\/tr><tr><td>microsecond<\/td><td>mcs<\/td><\/tr><tr><td>nanosecond<\/td><td>ns<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The <code>DATEDIFF()<\/code> function returns a value of integer indicating the difference between the <code>start_date<\/code> and <code>end_date<\/code>, with the unit specified by <code>date_part<\/code>.<\/p>\n\n\n\n<p>The <code>DATEDIFF()<\/code> function returns an error if the result is out of range for <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-int\/\">integer<\/a> (-2,147,483,648 to +2,147,483,647). In this case, you should use the <code>DATEDIFF_BIG()<\/code> function instead.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-datediff-function-examples'>SQL Server DATEDIFF() function examples <a href=\"#sql-server-datediff-function-examples\" class=\"anchor\" id=\"sql-server-datediff-function-examples\" title=\"Anchor for SQL Server &lt;code&gt;DATEDIFF()&lt;\/code&gt; function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>DATEDIFF()<\/code> function to understand it better.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='a-using-datediff-function-to-compare-the-differences-between-two-date-values'>A) Using DATEDIFF() function to compare the differences between two date values <a href=\"#a-using-datediff-function-to-compare-the-differences-between-two-date-values\" class=\"anchor\" id=\"a-using-datediff-function-to-compare-the-differences-between-two-date-values\" title=\"Anchor for A) Using &lt;code&gt;DATEDIFF()&lt;\/code&gt; function to compare the differences between two date values\">#<\/a><\/h3>\n\n\n\n<p>This example uses the <code>DATEDIFF()<\/code> function to compare the difference between two dates in various date parts:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">DECLARE<\/span> \n    @start_dt DATETIME2= <span class=\"hljs-string\">'2019-12-31 23:59:59.9999999'<\/span>, \n    @end_dt DATETIME2= <span class=\"hljs-string\">'2020-01-01 00:00:00.0000000'<\/span>;\n\n<span class=\"hljs-keyword\">SELECT<\/span> \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">year<\/span>, @start_dt, @end_dt) diff_in_year, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">quarter<\/span>, @start_dt, @end_dt) diff_in_quarter, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">month<\/span>, @start_dt, @end_dt) diff_in_month, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">dayofyear<\/span>, @start_dt, @end_dt) diff_in_dayofyear, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">day<\/span>, @start_dt, @end_dt) diff_in_day, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">week<\/span>, @start_dt, @end_dt) diff_in_week, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">hour<\/span>, @start_dt, @end_dt) diff_in_hour, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">minute<\/span>, @start_dt, @end_dt) diff_in_minute, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">second<\/span>, @start_dt, @end_dt) diff_in_second, \n    <span class=\"hljs-keyword\">DATEDIFF<\/span>(millisecond, @start_dt, @end_dt) diff_in_millisecond;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Here is the output:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"828\" height=\"36\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-DATEDIFF-Function-with-variables-example.png\" alt=\"SQL Server DATEDIFF Function with variables example\" class=\"wp-image-1418\" srcset=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-DATEDIFF-Function-with-variables-example.png 828w, https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-DATEDIFF-Function-with-variables-example-300x13.png 300w, https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-DATEDIFF-Function-with-variables-example-768x33.png 768w\" sizes=\"auto, (max-width: 828px) 100vw, 828px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id='b-using-datediff-function-with-table-column-example'>B) Using DATEDIFF() function with table column example <a href=\"#b-using-datediff-function-with-table-column-example\" class=\"anchor\" id=\"b-using-datediff-function-with-table-column-example\" title=\"Anchor for B) Using &lt;code&gt;DATEDIFF()&lt;\/code&gt; function with table column example\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>DATEDIFF()<\/code> function to compare the requested delivery date with the ship date in days and return if the order is on-time or late:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n    order_id, \n    required_date, \n    shipped_date,\n    <span class=\"hljs-keyword\">CASE<\/span>\n        <span class=\"hljs-keyword\">WHEN<\/span> <span class=\"hljs-keyword\">DATEDIFF<\/span>(<span class=\"hljs-keyword\">day<\/span>, required_date, shipped_date) &lt; <span class=\"hljs-number\">0<\/span>\n        <span class=\"hljs-keyword\">THEN<\/span> <span class=\"hljs-string\">'Late'<\/span>\n        <span class=\"hljs-keyword\">ELSE<\/span> <span class=\"hljs-string\">'OnTime'<\/span>\n    <span class=\"hljs-keyword\">END<\/span> shipment\n<span class=\"hljs-keyword\">FROM<\/span> \n    sales.orders\n<span class=\"hljs-keyword\">WHERE<\/span> \n    shipped_date <span class=\"hljs-keyword\">IS<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> \n    required_date;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Here is the output:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"282\" height=\"364\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-DATEDIFF-Function-Example.png\" alt=\"SQL Server DATEDIFF Function Example\" class=\"wp-image-1417\" srcset=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-DATEDIFF-Function-Example.png 282w, https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-DATEDIFF-Function-Example-232x300.png 232w\" sizes=\"auto, (max-width: 282px) 100vw, 282px\" \/><\/figure>\n\n\n\n<p>In this tutorial, you have learned how to use the SQL Server <code>DATEDIFF()<\/code> function to compute the difference between two date values.<\/p>\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=\"1416\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlservertutorial.net\/sql-server-date-functions\/sql-server-datediff-function\/\"\n\t\t\t\tdata-post-title=\"SQL Server DATEDIFF 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 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 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