smalldatetime (Transact-SQL)
Defines a date that is combined with a time of day. The time is based on a 24-hour day, with seconds always zero (:00) and without fractional seconds.
Note
Use the time, date, datetime2 and datetimeoffset data types for new work. These types align with the SQL Standard. They are more portable. time, datetime2 and datetimeoffset provide more seconds precision. datetimeoffset provides time zone support for globally deployed applications.
For an overview of all Transact-SQL date and time data types and functions, see Date and Time Functions (Transact-SQL). For information and examples that are common to date and time data types and functions, see Using Date and Time Data.
smalldatetime Description
Syntax |
smalldatetime |
Usage |
DECLARE @MySmalldatetime smalldatetime CREATE TABLE Table1 ( Column1 smalldatetime ) |
Default string literal formats (used for down-level client) |
Not applicable |
Date range |
1900-01-01 through 2079-06-06 January 1, 1900, through June 6, 2079 |
Time range |
00:00:00 through 23:59:59 2007-05-09 23:59:59 will round to 2007-05-10 00:00:00 |
Element ranges |
YYYY is four digits, ranging from 1900, to 2079, that represent a year. MM is two digits, ranging from 01 to 12, that represent a month in the specified year. DD is two digits, ranging from 01 to 31 depending on the month, that represent a day of the specified month. hh is two digits, ranging from 00 to 23, that represent the hour. mm is two digits, ranging from 00 to 59, that represent the minute. ss is two digits, ranging from 00 to 59, that represent the second. Values that are 29.998 seconds or less are rounded down to the nearest minute, Values of 29.999 seconds or more are rounded up to the nearest minute. |
Character length |
19 positions maximum |
Storage size |
4 bytes, fixed. |
Accuracy |
One minute |
Default value |
1900-01-01 00:00:00 |
Calendar |
Gregorian (Does not include the complete range of years.) |
User-defined fractional second precision |
No |
Time zone offset aware and preservation |
No |
Daylight saving aware |
No |
ANSI and ISO 8601 Compliance
smalldatetime is not ANSI or ISO 8601 compliant.
Examples
A. Casting string literals with seconds to smalldatetime
The following example compares the conversion of seconds in string literals to smalldatetime.
SELECT
CAST('2007-05-08 12:35:29' AS smalldatetime)
,CAST('2007-05-08 12:35:30' AS smalldatetime)
,CAST('2007-05-08 12:59:59.998' AS smalldatetime);
Input |
Output |
|---|---|
2007-05-08 12:35:29 |
2007-05-08 12:35:00 |
2007-05-08 12:35:30 |
2007-05-08 12:36:00 |
2007-05-08 12:59:59.998 |
2007-05-08 13:00:00 |
B. Comparing date and time data types
The following example compares the results of casting a string to each date and time data type.
SELECT
CAST('2007-05-08 12:35:29. 1234567 +12:15' AS time(7)) AS 'time'
,CAST('2007-05-08 12:35:29. 1234567 +12:15' AS date) AS 'date'
,CAST('2007-05-08 12:35:29.123' AS smalldatetime) AS
'smalldatetime'
,CAST('2007-05-08 12:35:29.123' AS datetime) AS 'datetime'
,CAST('2007-05-08 12:35:29. 1234567 +12:15' AS datetime2(7)) AS
'datetime2'
,CAST('2007-05-08 12:35:29.1234567 +12:15' AS datetimeoffset(7)) AS
'datetimeoffset';
Data type |
Output |
|---|---|
time |
12:35:29. 1234567 |
date |
2007-05-08 |
smalldatetime |
2007-05-08 12:35:00 |
datetime |
2007-05-08 12:35:29.123 |
datetime2 |
2007-05-08 12:35:29. 1234567 |
datetimeoffset |
2007-05-08 12:35:29.1234567 +12:15 |