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SQL DATEFROMPARTS

SQL DATEFROMPARTS() function is a date function that returns a date value that maps to a year, month, and day values.





SYNTAX

DATEFROMPARTS ( year, month , day )

The DATEFROMPARTS function accepts three parameters:

Year is an integer

Month is an integer, any month value between 1 to 12.

Day is an integer, any day between  1 to 31

Lets look at an example of Using DATEFROMPARTS function in SQL Server.

Following DATEFROMPARTS function returns a date for given month ,year , and day .

declare @yr as int ,@month as int ,@day as int

set @yr =2017
set @month =12
set @day =31
select DATEFROMPARTS(@yr, @month, @day) as Date

 

To get a date from given year, month, and day without using a DATEFROMPARTS function

To get a date from given year, month, day without using a DATEFROMPARTS function, you can use following T-SQL Code.

declare @yr as int ,@month as int ,@day as int

set @yr =2017
set @month =12
set @day =31
select CAST(@yr  as varchar)  + ‘-‘ + cast ( @month as varchar) + ‘-‘ +  cast ( @day as varchar) as date





DATEFROMPARTS function returns null, if any of year, month or day value is null

declare @yr as int, @month as int, @day as int
set @yr = 2017
set @month = null
set @day = 31

select DATEFROMPARTS(@yr, @month, @day) as Date

 

DATEFROMPARTS returns an error for any invalid day, month and year value

Lets pass an invalid value for month that is 34 to DATEFORMPARTS function.

declare @yr as int, @month as int, @day as int
set @yr =2017
set @month = 34
set @day = 31

select DATEFROMPARTS(@yr, @month, @day) as Date

As you can see, It gives an error syaing cannot construct data type date, some of the arguments have values which are not valid.




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