DATEDIFF
Returns the number of date and time boundaries crossed between two specified dates.

Syntax
DATEDIFF ( datepart , startdate , enddate )

Arguments
datepart

Is the parameter that specifies on which part of the date to calculate the difference. The table lists dateparts and abbreviations recognized by Microsoft® SQL Server™.

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


startdate

Is the beginning date for the calculation. startdate is an expression that returns a datetime or smalldatetime value, or a character string in a date format.

Because smalldatetime is accurate only to the minute, when a smalldatetime value is used, seconds and milliseconds are always 0.

If you specify only the last two digits of the year, values less than or equal to the last two digits of the value of the two digit year cutoff configuration option are in the same century as the cutoff year. Values greater than the last two digits of the value of this option are in the century that precedes the cutoff year. For example, if the two digit year cutoff is 2049 (default), 49 is interpreted as 2049 and 2050 is interpreted as 1950. To avoid ambiguity, use four-digit years.

For more information about specifying time values, see Time Formats. For more information about specifying dates, see datetime and smalldatetime.

enddate

Is the ending date for the calculation. enddate is an expression that returns a datetime or smalldatetime value, or a character string in a date format.

Return Types
integer

RuporAbsurda писал(а) 24. Июля 2008 :: 09:00:
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