DATEDIFF
Returns the count (signed integer) of the specified datepart boundaries crossed between the specified startdate and enddate.
Syntax
DATEDIFF ( datepart , startdate , enddate )
Arguments
datepart
Is the part of startdate and enddate that specifies the type of boundary crossed. The following table lists all valid datepart arguments. User-defined variable equivalents are not valid.
datepart | Abbreviations |
---|---|
year | yy, yyyy |
quarter | qq, q |
month | mm, m |
dayofyear | dy, y |
day | dd, d |
week | wk, ww |
hour | hh |
minute | mi, n |
second | ss, s |
millisecond | ms |
microsecond | mcs |
nanosecond | ns |
startdate
Is an expression that can be resolved to a time, date, smalldatetime, datetime, datetime2, or datetimeoffset value. date can be an expression, column expression, user-defined variable, or string literal. startdate is subtracted from enddate.
To avoid ambiguity, use four-digit years.
enddate
See startdate.
Return types
int
Example
SELECT DATEDIFF(hour, 0, '2007-05-10 12:10:09.331');