Notice that SQL Server interprets 0 as January 1, 1900. In the example, a number specifies the date. The base year helps with date calculations. You must explicitly cast the string to a datetime or smalldatetime type to use the YDM format. This means that DATENAME doesn't support the format YDM when the date is passed as a string. SELECT DATEPART(nanosecond, '00:00:01.1234567') - Returns 123456700ĭATEPART can be used in the select list, WHERE, HAVING, GROUP BY, and ORDER BY clauses.ĭATEPART implicitly casts string literals as a datetime2 type in SQL Server 2008 (10.0.x) and later. These statements show that DATEPART returns fractional seconds: SELECT DATEPART(millisecond, '00:00:01.1234567') - Returns 123 The example fails because the date part year is invalid for the time data type: DECLARE time = '12:10:30.123' In this example, variable has a time data type. If date is specified as a variable or table column, and the data type for that variable or column doesn't have the specified datepart, DATEPART will return error 9810. This statement has date part arguments for datepart, a time argument for date, and it returns 1900, 1, 1, 1, 2. If the date argument data type doesn't have the specified datepart, DATEPART will return the default for that datepart only when a literal is specified for date.įor example, the default year-month-day for any date data type is. Default Returned for a datepart That Isn't in a date Argument
For data types that can implicitly convert to datetimeoffset or datetime2, DATEPART returns the time offset in minutes.For datetimeoffset and datetime2, tzoffset returns the time offset in minutes, where the offset for datetime2 is always 0 minutes.This statement returns a time zone offset of 310 minutes: SELECT DATEPART (tzoffset, ' 00:00:01.1234567 +05:10') ĭATEPART renders the tzoffset value as follows: This table shows six possibilities: First day of weekĭATEPART returns the tzoffset ( tz) value as the number of minutes (signed).
Sql get week number iso#
The numbering systems of different countries/regions might not comply with the ISO standard. Note: the highest week number in a year could be either 52 or 53. Non-European countries/regions typically don't use it. European countries/regions typically use this style of numbering. For example, week 1 of 2004 (2004W01) covered Monday, 29 December 2003 to Sunday, 4 January 2004. Each week is associated with the year in which Thursday occurs. ISO 8601 includes the ISO week-date system, a numbering system for weeks. The values that are returned for DATEPART ( year, date), DATEPART ( month, date), and DATEPART ( day, date) are the same as those returned by the functions YEAR, MONTH, and DAY, respectively. SELECT DATEPART(week, ' '), DATEPART(weekday, ' ') SET DATEFIRST After setting DATEFIRST, use this suggested SQL statement for the datepart table values: This table shows the return value for the week and weekday datepart for ' ' for each SET DATEFIRST argument. January 1 of any year defines the starting number for the week datepart. The last two positions of the nanosecond datepart return value are always 00 and this value has a scale of 9:įor a week ( wk, ww) or weekday ( dw) datepart, the DATEPART return value depends on the value set by SET DATEFIRST. The date argument has a datetimeoffset(7) data type. This table lists all datepart arguments, with corresponding return values, for the statement SELECT DATEPART(datepart,' 12:15:32.1234567 +05:10'). SET DATEFORMAT doesn't change the return value when the date is a column expression of a date or time data type.
The return value depends on SET DATEFORMAT if date is a string literal of some formats. The return value depends on the language environment set by using SET LANGUAGE, and by the Configure the default language Server Configuration Option of the login. Return Type int Return ValueĮach datepart and its abbreviations return the same value. See Configure the two digit year cutoff Server Configuration Option for information about two-digit years. Use four-digit years to avoid ambiguity issues. datepartĪn expression that resolves to one of the following data types:įor date, DATEPART will accept a column expression, expression, string literal, or user-defined variable. DATEPART does not accept user-defined variable equivalents for the datepart arguments.
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