{"id":1160,"date":"2025-05-01T18:57:14","date_gmt":"2025-05-01T18:57:14","guid":{"rendered":"https:\/\/kourentzes.com\/konstantinos\/?p=1160"},"modified":"2025-05-01T18:57:15","modified_gmt":"2025-05-01T18:57:15","slug":"t-sql-date-functions-sql-server","status":"publish","type":"post","link":"https:\/\/kourentzes.com\/konstantinos\/index.php\/2025\/05\/01\/t-sql-date-functions-sql-server\/","title":{"rendered":"The Most Common Date Functions in T-SQL"},"content":{"rendered":"\n

Working with dates and times is a fundamental aspect of database development and reporting. T-SQL (Transact-SQL), Microsoft’s extension of SQL, offers a robust set of functions to handle date and time values efficiently. This article presents the most commonly used date functions in T-SQL<\/strong>, organized by category and use case, with syntax, examples, and notes on performance.<\/p>\n\n\n\n

\n\n\n\n

1. GETDATE() and SYSDATETIME()<\/strong><\/h2>\n\n\n\n

Returns the current system date and time.<\/p>\n\n\n\n

Function<\/th>Returns<\/th>Precision<\/th><\/tr><\/thead>
GETDATE()<\/code><\/td>datetime<\/code><\/td>3.33 ms<\/td><\/tr>
SYSDATETIME()<\/code><\/td>datetime2<\/code><\/td>100 ns<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
<\/pre>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
SELECT<\/span> <\/span>GETDATE<\/span>();        <\/span>-- e.g., 2025-05-01 14:32:45.340<\/span><\/span>\nSELECT<\/span> <\/span>SYSDATETIME<\/span>();    <\/span>-- e.g., 2025-05-01 14:32:45.3401234<\/span><\/span><\/code><\/pre>SQL<\/span><\/div>\n\n\n\n
Use SYSDATETIME()<\/code> when you need higher precision.<\/p>\n\n\n\n
\n\n\n\n
2. DATEPART(), DATENAME(), YEAR(), MONTH(), DAY()<\/strong><\/h2>\n\n\n\n
These functions extract components of a date.<\/p>\n\n\n\n
Function<\/th>Description<\/th><\/tr><\/thead>
DATEPART(part, date)<\/code><\/td>Returns an integer of the date part.<\/td><\/tr>
DATENAME(part, date)<\/code><\/td>Returns the name (e.g., Monday).<\/td><\/tr>
YEAR(date)<\/code><\/td>Extracts the year.<\/td><\/tr>
MONTH(date)<\/code><\/td>Extracts the month (1-12).<\/td><\/tr>
DAY(date)<\/code><\/td>Extracts the day of the month.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
<\/pre>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
SELECT<\/span> <\/span>DATEPART<\/span>(<\/span>weekday<\/span>, <\/span>GETDATE<\/span>()); <\/span>-- e.g., 5 (Friday)<\/span><\/span>\nSELECT<\/span> <\/span>DATENAME<\/span>(<\/span>weekday<\/span>, <\/span>GETDATE<\/span>()); <\/span>-- e.g., 'Friday'<\/span><\/span>\nSELECT<\/span> <\/span>YEAR<\/span>(<\/span>GETDATE<\/span>());              <\/span>-- e.g., 2025<\/span><\/span>\n<\/span><\/code><\/pre>SQL<\/span><\/div>\n\n\n\n
\n\n\n\n
3. DATEADD()<\/strong><\/h2>\n\n\n\n
Adds (or subtracts) a time interval to a date.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
-- Add 10 days<\/span><\/span>\nSELECT<\/span> <\/span>DATEADD<\/span>(<\/span>day<\/span>, <\/span>10<\/span>, <\/span>'<\/span>2025-05-01<\/span>'<\/span>);  <\/span>-- 2025-05-11<\/span><\/span>\n<\/span>\n-- Subtract 1 month<\/span><\/span>\nSELECT<\/span> <\/span>DATEADD<\/span>(<\/span>month<\/span>, <\/span>-<\/span>1<\/span>, <\/span>'<\/span>2025-05-01<\/span>'<\/span>); <\/span>-- 2025-04-01<\/span><\/span>\n<\/span><\/code><\/pre>SQL<\/span><\/div>\n\n\n\n
This is critical for rolling time windows, future projections, etc.<\/p>\n\n\n\n
\n\n\n\n
4. DATEDIFF()<\/strong><\/h2>\n\n\n\n
Calculates the difference between two dates, in terms of a specified date part.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
-- Days between dates<\/span><\/span>\nSELECT<\/span> <\/span>DATEDIFF<\/span>(<\/span>day<\/span>, <\/span>'<\/span>2025-01-01<\/span>'<\/span>, <\/span>'<\/span>2025-05-01<\/span>'<\/span>); <\/span>-- 120<\/span><\/span>\n<\/span>\n-- Months between dates<\/span><\/span>\nSELECT<\/span> <\/span>DATEDIFF<\/span>(<\/span>month<\/span>, <\/span>'<\/span>2024-05-01<\/span>'<\/span>, <\/span>'<\/span>2025-05-01<\/span>'<\/span>); <\/span>-- 12<\/span><\/span>\n<\/span><\/code><\/pre>SQL<\/span><\/div>\n\n\n\n
Returns whole<\/em> number differences. Always be mindful of truncation behavior.<\/p>\n\n\n\n
\n\n\n\n
EOMONTH()<\/strong><\/h2>\n\n\n\n
Returns the last day<\/strong> of the month that contains the specified date.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
SELECT<\/span> <\/span>EOMONTH<\/span>(<\/span>'<\/span>2025-05-01<\/span>'<\/span>);        <\/span>-- 2025-05-31<\/span><\/span>\nSELECT<\/span> <\/span>EOMONTH<\/span>(<\/span>'<\/span>2025-05-01<\/span>'<\/span>, <\/span>1<\/span>);     <\/span>-- 2025-06-30<\/span><\/span>\n<\/span><\/code><\/pre>SQL<\/span><\/div>\n\n\n\n
Perfect for financial or monthly reporting.<\/p>\n\n\n\n
\n\n\n\n
6. SWITCHOFFSET() and TODATETIMEOFFSET()<\/strong><\/h2>\n\n\n\n
Used when working with time zones<\/strong> and datetimeoffset<\/code> data types.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
-- Adjust to UTC+2<\/span><\/span>\nSELECT<\/span> <\/span>SWITCHOFFSET<\/span>(<\/span>SYSDATETIMEOFFSET<\/span>(), <\/span>'<\/span>+02:00<\/span>'<\/span>);<\/span><\/span>\n<\/span>\n-- Set an offset explicitly<\/span><\/span>\nSELECT<\/span> <\/span>TODATETIMEOFFSET<\/span>(<\/span>SYSDATETIME<\/span>(), <\/span>'<\/span>+03:00<\/span>'<\/span>);<\/span><\/span>\n<\/span><\/code><\/pre>SQL<\/span><\/div>\n\n\n\n
These functions are crucial for global applications with multiple time zones.<\/p>\n\n\n\n
\n\n\n\n
7. CONVERT() and CAST()<\/strong> (For Formatting and Type Conversion)<\/h2>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
-- Convert to date only<\/span><\/span>\nSELECT<\/span> <\/span>CONVERT<\/span>(<\/span>date<\/span>, <\/span>GETDATE<\/span>());      <\/span>-- 2025-05-01<\/span><\/span>\n<\/span>\n-- Convert to string<\/span><\/span>\nSELECT<\/span> <\/span>CONVERT<\/span>(<\/span>varchar<\/span>, <\/span>GETDATE<\/span>(), <\/span>120<\/span>); <\/span>-- '2025-05-01 14:35:00'<\/span><\/span><\/code><\/pre>SQL<\/span><\/div>\n\n\n\n
<\/pre>\n\n\n\n
Style Code<\/th>Format Example<\/th><\/tr><\/thead>
103<\/td>dd\/mm\/yyyy<\/td><\/tr>
112<\/td>yyyymmdd (ISO)<\/td><\/tr>
120<\/td>yyyy-mm-dd hh:mi:ss (ISO)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
📌 Use CAST()<\/code> for ANSI SQL compatibility, and CONVERT()<\/code> when style formatting is needed.<\/p>\n\n\n\n
\n\n\n\n
Bonus: ISDATE()<\/strong><\/h2>\n\n\n\n
Checks if a string can be converted to a valid date.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
SELECT<\/span> <\/span>ISDATE<\/span>(<\/span>'<\/span>2025-05-01<\/span>'<\/span>);     <\/span>-- 1 (true)<\/span><\/span>\nSELECT<\/span> <\/span>ISDATE<\/span>(<\/span>'<\/span>not-a-date<\/span>'<\/span>);     <\/span>-- 0 (false)<\/span><\/span>\n<\/span><\/code><\/pre>SQL<\/span><\/div>\n\n\n\n
Great for data validation<\/strong> in dynamic T-SQL scripts.<\/p>\n\n\n\n
\n\n\n\n
Summary Table<\/h2>\n\n\n\n
Function<\/th>Purpose<\/th><\/tr><\/thead>
GETDATE()<\/code><\/td>Current system datetime<\/td><\/tr>
SYSDATETIME()<\/code><\/td>High-precision current datetime<\/td><\/tr>
DATEPART()<\/code><\/td>Extract part of a date as int<\/td><\/tr>
DATENAME()<\/code><\/td>Extract part of a date as string<\/td><\/tr>
DATEADD()<\/code><\/td>Add\/subtract date parts<\/td><\/tr>
DATEDIFF()<\/code><\/td>Calculate difference between dates<\/td><\/tr>
EOMONTH()<\/code><\/td>Get last day of the month<\/td><\/tr>
CONVERT()<\/code><\/td>Format and convert date types<\/td><\/tr>
ISDATE()<\/code><\/td>Check if value is a valid date<\/td><\/tr>
SWITCHOFFSET()<\/code><\/td>Adjust timezone for datetimeoffset<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
Final Thoughts<\/h2>\n\n\n\n
Mastering these T-SQL date functions can save you countless hours when dealing with reporting, data transformations, and analytics. Whether you’re building a monthly dashboard<\/strong>, cleaning up dirty data<\/strong>, or optimizing for time-based queries<\/strong>, these tools form the backbone of time manipulation in SQL Server.<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Master the most useful T-SQL date functions in SQL Server. Learn how to use GETDATE, DATEADD, DATEDIFF, EOMONTH, and more with practical examples and tips.<\/p>\n","protected":false},"author":1,"featured_media":1161,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[10,863],"tags":[867,866,868,870,865,875,872,869,143,873,871,42,876,874,864],"class_list":["post-1160","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-code-snipperts","category-t-sql","tag-date-functions","tag-sql-convert-datetime","tag-sql-dateadd","tag-sql-datediff","tag-sql-datetime","tag-sql-datetime-examples","tag-sql-eomonth","tag-sql-getdate","tag-sql-server","tag-sql-server-functions","tag-sql-tips","tag-t-sql","tag-transact-sql","tag-tsql-cheat-sheet","tag-tsql-tutorial"],"yoast_head":"\nThe Most Common Date Functions in T-SQL - konstantinos.kourentzes.com<\/title>\n<meta name=\"description\" content=\"Master the most useful T-SQL date functions in SQL Server. 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