Question

How do I update a Date Field

Asked by: mpdillon

I would like to add 37 days to a date field. The following update does not work. What is the correct method to do this?

Update TableA Set BeginDt = DataAdd('d',37,BeginDt)

thanks,
pat

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Asked On
2008-09-17 at 09:31:43ID23739316
Tags

Microslft

,

SQL Server

,

2005

Topics

MS SQL Server

,

SQL Server 2005

,

SQL Server 2008

Participating Experts
3
Points
500
Comments
5

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Answers

 

by: matthewspatrickPosted on 2008-09-17 at 09:35:22ID: 22500696

UPDATE SomeTable
SET BeginDt = DATEADD(d, 37, BeginDt)

 

by: jimhornPosted on 2008-09-17 at 09:35:25ID: 22500697

Update TableA
Set BeginDt = DATEADD(day, 37, BeginDt)

 

by: simonetPosted on 2008-09-17 at 09:41:10ID: 22500756

The integer part of a Datetime field is the number of days from the reference date (31/12/1899). Thus, this will work:


UPDATE TableA SET BeginDt = BeginDt + 37


Alex

 

by: mpdillonPosted on 2008-09-17 at 10:05:19ID: 31497394

Thanks. It was the single quotes

 

by: matthewspatrickPosted on 2008-09-17 at 10:09:59ID: 22501081

simonet said:
>>The integer part of a Datetime field

Alex, you're thinking of how Access, Excel, and VBA/VB6 handle dates and times.  In SQL Server, the
datetime data type actually uses two ints, one encoding the day and the other the number of miliseconds
you are into the day.  From Books Online:


"Remarks
Values with the datetime data type are stored internally by Microsoft SQL Server as two 4-byte integers. The first 4 bytes store the number of days before or after the base date, January 1, 1900. The base date is the system reference date. Values for datetime earlier than January 1, 1753, are not permitted. The other 4 bytes store the time of day represented as the number of milliseconds after midnight.

The smalldatetime data type stores dates and times of day with less precision than datetime. SQL Server stores smalldatetime values as two 2-byte integers. The first 2 bytes store the number of days after January 1, 1900. The other 2 bytes store the number of minutes since midnight. Dates range from January 1, 1900, through June 6, 2079, with accuracy to the minute."

20120131-EE-VQP-002

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