DATEDIFF (SSIS Expression)

Article
06/13/2017

Returns the number of date and time boundaries crossed between two specified dates. The datepart parameter identifies which date and time boundaries to compare.

Syntax

  
DATEDIFF(datepart, startdate, endate)

Arguments

datepart
Is the parameter that specifies which part of the date to compare and return a value for.

startdate
Is the start date of the interval.

endate
Is the end date of the interval.

Result Types

DT_I4

Remarks

The following table lists the dateparts and abbreviations recognized by the expression evaluator.

Datepart	Abbreviations
Year	yy, yyyy
Quarter	qq, q
Month	mm, m
Dayofyear	dy, y
Day	dd, d
Week	wk, ww
Weekday	dw, w
Hour	Hh
Minute	mi, n
Second	ss, s
Millisecond	Ms

DATEDIFF returns a null result if any argument is null.

A date literal must be explicitly cast to one of the date data types. For more information, see Integration Services Data Types.

An error occurs if a date is not valid, if the date or time unit is not a string, if the start date is not a date, or if the end date is not a date.

If the end date is earlier than the start date, the function returns a negative number. If the start and end dates are equal or fall within the same interval, the function returns zero.

SSIS Expression Examples

This example calculates the number of days between two date literals. If the date is in "mm/dd/yyyy" format, the function returns 7.

DATEDIFF("dd", (DT_DBTIMESTAMP)"8/1/2003", (DT_DBTIMESTAMP)"8/8/2003")

This example returns the number of months between a date literal and the current date.

DATEDIFF("mm", (DT_DBTIMESTAMP)"8/1/2003",GETDATE())

This example returns the number of weeks between the date in the ModifiedDate column and the YearEndDate variable. If YearEndDate has a date data type, no explicit casting is required.

DATEDIFF("Week", ModifiedDate,@YearEndDate)

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