SQL Server convert from string to smalldatetime

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-- SQL Server convert from string to smalldatetime

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-- T-SQL convert from format mm/dd/yyyy to smalldatetime

SELECT CONVERT(smalldatetime, '10/23/2016', 101)

-- 2016-10-23 00:00:00

-- MSSQL convert from format dd/mm/yyyy to smalldatetime

SELECT CONVERT(smalldatetime, '23/10/2016', 103)

-- 2016-10-23 00:00:00

-- Month 23 is out of range

SELECT CONVERT(smalldatetime, '23/10/2016', 101)

/* Msg 242, Level 16, State 3, Line 1

The conversion of a varchar data type to a smalldatetime data type resulted

in an out-of-range value.

*/

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-- Translate/convert string/text hours and minutes to seconds

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DECLARE @TimeStr varchar(16) = '20:49:30'

SELECT   PARSENAME(REPLACE(@TimeStr,':','.'),1)

       + PARSENAME(REPLACE(@TimeStr,':','.'),2) * 60

       + PARSENAME(REPLACE(@TimeStr,':','.'),3) * 3600

-- 74970

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Converting string dates from a table

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-- Converting string dates from a table

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-- Create and populate a test table with a string date

USE tempdb;

SELECT

      DepartmentID,

      LastUpdate=CONVERT(varchar,

                 dateadd(day, DepartmentID, ModifiedDate),100)

INTO DeptInfo

FROM AdventureWorks.HumanResources.Department

SELECT * FROM DeptInfo

/* Partial results

DepartmentID      LastUpdate

1                       Jun  2 1998 12:00AM

2                       Jun  3 1998 12:00AM

*/

-- Convert string date column to datetime

SELECT

      DepartmentID,

      LastChangeDate=convert(datetime, LastUpdate)

FROM DeptInfo

/* Partial results

DepartmentID            LastChangeDate

1                       1998-06-02 00:00:00.000

2                       1998-06-03 00:00:00.000

*/

DROP TABLE DeptInfo

GO

SQL DateTime Conversion to many style (Formats)

USE AdventureWorks

SET LANGUAGE us_english

-- Convert string to date using style (format) numbers - sql dates format

-- SQL convert text to date - SQL convert string to date / datetime

SELECT convert(datetime,'15/03/18',3) -- 2018-03-15 00:00:00.000

SELECT convert(datetime,'15.03.18',4) -- 2018-03-15 00:00:00.000

-- Convert datetime to text style (format) list - sql time format

-- SQL Server without century (YY) date styles (there are exceptions!)

-- Generally adding 100 to style number results in century format CCYY / YYYY

SELECT convert(varchar,getdate())    -- Mar 15 2018 10:35AM

SELECT convert(varchar,getdate(),0)  -- Mar 15 2018 10:35AM

SELECT convert(varchar,getdate(),1)  -- 03/15/18

SELECT convert(varchar,getdate(),2)  -- 18.03.15

SELECT convert(varchar,getdate(),3)  -- 15/03/18

SELECT convert(varchar,getdate(),4)  -- 15.03.18

SELECT convert(varchar,getdate(),5)  -- 15-03-18

SELECT convert(varchar,getdate(),6)  -- 15 Mar 18

SELECT convert(varchar,getdate(),7)  -- Mar 15, 18

SELECT convert(varchar,getdate(),8)  -- 10:39:39

SELECT convert(varchar,getdate(),9)  -- Mar 15 2018 10:39:48:373AM

SELECT convert(varchar,getdate(),10) -- 03-15-18

SELECT convert(varchar,getdate(),11) -- 18/03/15

SELECT convert(varchar,getdate(),15) -- 180315

SELECT convert(varchar,getdate(),13) -- 15 Mar 2018 10:41:07:590

SELECT convert(varchar,getdate(),14) -- 10:41:25:903

SELECT convert(varchar,getdate(),20) -- 2018-03-15 10:43:56

SELECT convert(varchar,getdate(),21) -- 2018-03-15 10:44:04.950

SELECT convert(varchar,getdate(),22) -- 03/15/18 10:44:50 AM

SELECT convert(varchar,getdate(),23) -- 2018-03-15

SELECT convert(varchar,getdate(),24) -- 10:45:45

SELECT convert(varchar,getdate(),25) -- 2018-03-15 10:46:11.263

-- T-SQL with century (YYYY or CCYY) datetime styles (formats)

SELECT convert(varchar, getdate(), 100) -- Oct 23 2016 10:22AM (or PM)
SELECT convert(varchar, getdate(), 101) -- 10/23/2016

SELECT convert(varchar, getdate(), 102) -- 2016.10.23

SELECT convert(varchar, getdate(), 103) -- 23/10/2016

SELECT convert(varchar, getdate(), 104) -- 23.10.2016

SELECT convert(varchar, getdate(), 105) -- 23-10-2016

SELECT convert(varchar, getdate(), 106) -- 23 Oct 2016

SELECT convert(varchar, getdate(), 107) -- Oct 23, 2016

SELECT convert(varchar, getdate(), 108) -- 09:10:34

SELECT convert(varchar, getdate(), 109) -- Oct 23 2016 11:10:33:993AM (or PM)

SELECT convert(varchar, getdate(), 110) -- 10-23-2016

SELECT convert(varchar, getdate(), 111) -- 2016/10/23

SELECT convert(varchar, getdate(), 112) -- 20161023

SELECT convert(varchar, getdate(), 113) -- 23 Oct 2016 06:10:55:383

SELECT convert(varchar, getdate(), 114) -- 06:10:55:383(24h)

SELECT convert(varchar, getdate(), 120) -- 2016-10-23 06:10:55(24h)

SELECT convert(varchar, getdate(), 121) -- 2016-10-23 06:10:55.383

SELECT convert(varchar, getdate(), 126) -- 2016-10-23T06:10:55.383

GO