![]() If startdate and enddate have different year values but they have the same calendar week values, DATEDIFF_BIG will return 0 for datepart week. The difference between the startdate and enddate in each statement crosses one calendar or time boundary of its datepart. Those dates are adjacent and they differ in time by one hundred nanoseconds (.0000001 second). ![]() The following statements have the same startdate and the same enddate values. If startdate and enddate have different date data types, and one has more time parts or fractional seconds precision than the other, DATEDIFF_BIG sets the missing parts of the other to 0. If either startdate or enddate have only a time part and the other only a date part, DATEDIFF_BIG sets the missing time and date parts to the default values. If only a date value is assigned to a variable of a time or date data type, DATEDIFF_BIG sets the value of the missing time part to the default value: 00:00:00. If only a time value is assigned to a date data type variable, DATEDIFF_BIG sets the value of the missing date part to the default value. If startdate and enddate are both assigned only a time value, and the datepart isn't a time datepart, DATEDIFF_BIG returns 0.ĭATEDIFF_BIG does use a time zone offset component of startdate or enddate to calculate the return value.įor a smalldatetime value used for startdate or enddate, DATEDIFF_BIG always sets seconds and milliseconds to 0 in the return value because smalldatetime only has accuracy to the minute. Unlike, which returns an int and therefore may overflow a minute or higher, DATEDIFF_BIG can only overflow if using nanosecond precision where the difference between enddate and startdate is more than 292 years, 3 months, 10 days, 23 hours, 47 minutes, and 16.8547758 seconds. Returns the bigint difference between the startdate and enddate, expressed in the boundary set by datepart.įor a return value out of range for bigint (-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807), DATEDIFF_BIG returns an error. ![]() See Configure the two digit year cutoff Server Configuration Option for information about two-digit years. To avoid ambiguity, use four-digit years. DATEDIFF_BIG subtracts startdate from enddate. Use four-digit years to avoid ambiguity issues. A string literal value must resolve to a datetime. Each specific datepart name and abbreviations for that datepart name will return the same value.Īn expression that can resolve to one of the following values:įor date, DATEDIFF_BIG will accept a column expression, expression, string literal, or user-defined variable.
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