CODEWITHSUNDEEP
sqldatetimecastinginteger
Daniel
Daniel

Reputation: 7038

Convert INT to DATETIME (SQL)

I am trying to convert a date to datetime but am getting errors. The datatype I'm converting from is (float,null) and I'd like to convert it to DATETIME.

The first line of this code works fine, but I get this error on the second line:

Arithmetic overflow error converting expression to data type datetime.

CAST(CAST( rnwl_efctv_dt AS INT) AS char(8)),
CAST(CAST( rnwl_efctv_dt AS INT) AS DATETIME),

Upvotes: 55

Views: 625835

Answers (5)

Raj Tandukar
Raj Tandukar

Reputation: 19

Convert(VARCHAR(10), CAST(CONVERT(char(8), "Replace with you date") as date), 101) "Your alias"

Upvotes: -1

Charlieface
Charlieface

Reputation: 72289

A simpler, and possibly faster solution is to use DATEFROMPARTS and a bit of arithmetic.

DECLARE @v bigint = 20220623;
SELECT DATEFROMPARTS(@v / 10000, @v / 100 % 100, @v % 100);
Result
2022-06-23

db<>fiddle

Upvotes: 7

WildBill
WildBill

Reputation: 31

use a where clause on that field to ignore nulls and zero values

update
    table
set
    BDOS= CONVERT(datetime, convert(char(8), field))
where 
    isnull(field,0)<>0

Upvotes: 3

rchacko
rchacko

Reputation: 2129

Try this:

select CONVERT(datetime, convert(varchar(10), 20120103))

Upvotes: 8

SQLMenace
SQLMenace

Reputation: 135151

you need to convert to char first because converting to int adds those days to 1900-01-01

select CONVERT (datetime,convert(char(8),rnwl_efctv_dt ))

here are some examples

select CONVERT (datetime,5)

1900-01-06 00:00:00.000

select CONVERT (datetime,20100101)

blows up, because you can't add 20100101 days to 1900-01-01..you go above the limit

convert to char first 

declare @i int
select @i = 20100101
select CONVERT (datetime,convert(char(8),@i))

Upvotes: 79

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