Converting other date and time types to the datetime data type For information about using the CAST and CONVERT functions with date and time data, see CAST and CONVERT (Transact-SQL). When you convert to date and time data types, SQL Server rejects all values it can't recognize as dates or times. User-specified valueĭatetime isn't ANSI or ISO 8601 compliant. 007 seconds, as shown in the following table. Rounding of datetime fractional second precisionĭatetime values are rounded to increments of. constant_value must follow these formats for each literal_type. ![]() ' constant_value' is the value of the escape sequence. Timestamps have three literal_type specifiers: literal_type specifies the type of the escape sequence. ODBC timestamp escape sequences are of the format: : Applications that use the ADO, OLE DB, and ODBC-based APIs can use this ODBC timestamp format to represent dates and times. This ODBC timestamp format is also supported by the OLE DB language definition (DBGUID-SQL) supported by the Microsoft OLE DB provider for SQL Server. The ODBC API defines escape sequences to represent date and time values, which ODBC calls timestamp data. Also, this format isn't affected by the SET DATEFORMAT or SET LANGUAGE setting. The advantage in using the ISO 8601 format is that it is an international standard with unambiguous specification. The T indicates the start of the time part of the datetime value. The time component is specified in the 24-hour format. The brackets indicate that the fraction of second component is optional. To use the ISO 8601 format, you must specify each element in the format, including the T, the colons (:), and the period (.) that are shown in the format. The SET DATEFORMAT session setting isn't applied when you specify the month in alphabetical form. To avoid ambiguity, use four-digit years.Ĥ) If the day is missing, the first day of the month is supplied. For example, if two digit year cutoff is 2050 (default), 25 is interpreted as 2025 and 50 is interpreted as 1950. Values greater than or equal to the value of this option are in the century that comes before the cutoff year. For languages other than English, use N'Ģ) Characters that are enclosed in brackets are optional.ģ) If you specify only the last two digits of the year, values less than the last two digits of the value of the Configure the two digit year cutoff Server Configuration Option configuration option are in the same century as the cutoff year. Here are some guidelines for using alphabetical date formats:ġ) Enclose the date and time data in single quotation marks ('). For example, April or the month abbreviation of Apr specified in the current language commas are optional and capitalization is ignored. You can specify date data with a month specified as the full month name. A four-part year is interpreted as the year. For example, 12/10/08 can be interpreted as one of six dates, depending on the DATEFORMAT setting. Out-of-order dates may be misinterpreted as out of range or with wrong values. If the order doesn't match the setting, the values aren't interpreted as dates. The setting for SET DATEFORMAT determines how date values are interpreted. You can change the date order by using the SET DATEFORMAT statement. ![]() When the language is set to us_english, the default order for the date is mdy. ![]() Number separator number separator number This string must appear in the following form: When you use numeric date format, specify the month, day, and year in a string that uses slash marks (/), hyphens (-), or periods (.) as separators. For example, 5/20/97 represents the twentieth day of May 1997. You can specify date data with a numeric month specified. If the environment isn't us_english, the string literals should be in the format N'string_literaL'. Except for ODBC, datetime string literals are in single quotation marks ('), for example, 'string_literaL'. The following tables list the supported string literal formats for datetime. Supported string literal formats for datetime Gregorian (Does include the complete range of years.) ![]() N* is zero to three digits, ranging from 0 to 999, that represent the fractional seconds. Ss is two digits, ranging from 00 to 59, that represent the second. Mm is two digits, ranging from 00 to 59, that represent the minute. Hh is two digits, ranging from 00 to 23, that represent the hour. MM is two digits, ranging from 01 to 12, that represent a month in the specified year.ĭD is two digits, ranging from 01 to 31 depending on the month, that represent a day of the specified month. YYYY is four digits from 1753 through 9999 that represent a year. datetimeoffset provides time zone support for globally deployed applications. time, datetime2 and datetimeoffset provide more seconds precision. Use the time, date, datetime2 and datetimeoffset data types for new work.
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