< SQL Server Date Functions
Definition and Usage
The DATEDIFF() function returns the time between two dates.
Syntax
DATEDIFF(datepart,startdate,enddate)
Where startdate and enddate are valid date expressions and datepart can be one of the following:
| datepart | Abbreviation |
|---|---|
| year | yy, yyyy |
| quarter | qq, q |
| month | mm, m |
| dayofyear | dy, y |
| day | dd, d |
| week | wk, ww |
| weekday | dw, w |
| hour | hh |
| minute | mi, n |
| second | ss, s |
| millisecond | ms | microsecond | mcs |
| nanosecond | ns |
Example
Now we want to get the number of days between two dates.
We use the following SELECT statement:
SELECT DATEDIFF(day,'2014-06-05','2014-08-05') AS DiffDate
Result:
| DiffDate |
|---|
| 61 |
Example
Now we want to get the number of days between two dates (notice that the second date is "earlier" than the first date, and will result in a negative number).
We use the following SELECT statement:
SELECT DATEDIFF(day,'2014-08-05','2014-06-05') AS DiffDate
Result:
| DiffDate |
|---|
| -61 |
< SQL Server Date Functions