Convert varchar into datetime in SQL Server

Question

How do I convert a string of format mmddyyyy into datetime in SQL Server 2008   My target column is in DateTime  I have tried with Convert and most of the Date style values however I get an error message       The conversion of a varchar data type to a datetime data type resulted in an out-of-range value

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I had luck with something similar   Convert DATETIME  CONVERT VARCHAR 2    Month          CONVERT VARCHAR 2    Day          CONVERT VARCHAR 4    Year

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This seems the easiest way    SELECT REPLACE CONVERT CHAR 10   GETDATE    110   -

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Likely you have bad data that cannot convert  Dates should never be stored in varchar becasue it will allow dates such as ASAP or 02 30 2009  Use the isdate   function on your data to find the records which can t convert   OK I tested with known good data and still got the message  You need to convert to a different format becasue it does not know if 12302009  is mmddyyyy or ddmmyyyy  The format of yyyymmdd is not ambiguous and SQL Server will convert it correctly  I got this to work   cast  right  date 4    left  date 4  as datetime    You will still get an error message though if you have any that are in a non-standard format  like  112009  or some text value or a true out of range date

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DECLARE  d char 8  SET  d    06082020        MMDDYYYY means June 8  2020    SELECT CAST FORMAT  CAST   d AS INT                 as DATETIME    Result returned is the original date string in  d as a DateTime

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OP wants mmddyy and a plain convert will not work for that   select convert datetime  12312009    Msg 242  Level 16  State 3  Line 1  The conversion of a char data type to a datetime data type resulted in  an out-of-range datetime value   so try this   DECLARE  Date char 8  set  Date  12312009  SELECT CONVERT datetime RIGHT  Date 4  LEFT  Date 2  SUBSTRING  Date 3 2     OUTPUT   ----------------------- 2009-12-31 00 00 00 000   1 row s  affected

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SQL standard dates while inserting or updating Must be between 1 1 1753 12 00 00 AM and 12 31 9999 11 59 59 PM   So if you are inserting Updating below 1 1 1753 you will get this error

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Convert would be the normal answer  but the format is not a recognised format for the converter  mm dd yyyy could be converted using convert datetime yourdatestring 101  but you do not have that format so it fails   The problem is the format being non-standard  you will have to manipulate it to a standard the convert can understand from those available   Hacked together  if you can guarentee the format  declare  date char 8  set  date    12312009  select convert datetime  substring  date 5 4    substring  date 1 2    substring  date 3 2  112

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I found this helpful for my conversion  without string manipulation  https   docs microsoft com en-us sql t-sql functions cast-and-convert-transact-sql  CONVERT VARCHAR 23    lastUploadEndDate  121    yyyy-mm-dd hh mi ss mmm 24h  was the format I needed

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use Try Convert Returns a value cast to the specified data type if the cast succeeds  otherwise  returns null   DECLARE  DateString VARCHAR 10    20160805  SELECT TRY CONVERT DATETIME  DateString   SET  DateString   Invalid Date  SELECT TRY CONVERT DATETIME  DateString    Link MSDN TRY CONVERT  Transact-SQL

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I d use STUFF to insert dividing chars and then use CONVERT with the appropriate style  Something like this   DECLARE  dt VARCHAR 100   111290   SELECT CONVERT DATETIME STUFF STUFF  dt 3 0      6 0      3    First you use two times STUFF to get 11 12 90 instead of 111290  than you use the 3 to convert this to datetime  or any other fitting format  use   for german  - for british     More details on CAST and CONVERT  Best was  to store date and time values properly    This should be either  universal unseparated format  yyyyMMdd  or  especially within XML  it should be ISO8601  yyyy-MM-dd or yyyy-MM-ddThh mm ss More details on ISO8601   Any culture specific format will lead into troubles sooner or later

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SQL Server can implicitly cast strings in the form of  YYYYMMDD  to a datetime - all other strings must be explicitly cast   here are two quick code blocks which will do the conversion from the form you are talking about   version 1 uses unit variables   BEGIN  DECLARE  input VARCHAR 8    mon CHAR 2     day char 2    year char 4    output DATETIME  SET  input    10022009    --today s date   SELECT  mon   LEFT  input  2    day   SUBSTRING  input  3 2    year   RIGHT  input 4   SELECT  output    year  mon  day  SELECT  output  END   version 2 does not use unit variables   BEGIN  DECLARE  input CHAR 8    output DATETIME SET  input    10022009  --today s date   SELECT  output   RIGHT  input 4    SUBSTRING  input  3 2    LEFT  input  2   SELECT  output END   Both cases rely on sql server s ability to do that implicit conversion

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The root cause of this issue can be in the regional settings - DB waiting for YYYY-MM-DD while an app sents  for example  DD-MM-YYYY  Russian locale format  as it was in my case  All I did - change locale format from Russian to English  United States  and voil

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Look at CAST   CONVERT in BOL that should be a start   If your target column is datetime you don t need to convert it  SQL will do it for you   Otherwise   CONVERT datetime   20090101     Should do it   This is a link that should help as well

[sql] Convert varchar into datetime in SQL Server

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