Course Recommendation:
SQL Server DATEDIFF() Function
Definition and Usage
The DATEDIFF() function returns the time between two dates.
SyntaxdatepartDATEDIFF()DATEDIFF(and,
) startdate and The parameter is a valid date expression.
datepart The parameter can be one of the following values:
| datepart | Abbreviations |
|---|---|
| Years | yy, yyyy |
| Quarters | qq, q |
| Months | mm, m |
| Days of the Year | dy, y |
| Days | dd, d |
| Weeks | wk, ww |
| Weeks | dw, w |
| Hours | hh |
| Minutes | mi, n |
| Seconds | ss, s |
| Milliseconds | ms |
| Microseconds | mcs |
| Nanoseconds | ns |
Instance
Example 1
Use the following SELECT statement:
SELECT DATEDIFF(day,'2008-12-29','2008-12-30') AS DiffDate
Result:
| DiffDate |
|---|
| 1 |
Example 2
Use the following SELECT statement:
SELECT DATEDIFF(day,'2008-12-30','2008-12-29') AS DiffDate
Result:
| DiffDate |
|---|
| -1 |
