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Converting a text description of time to an ordinary Datetime value in SQL 2008

Posted on 2011-02-23
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Last Modified: 2012-05-11
I want to convert a varchar expression describing time into a date time value.  I will be given descriptions like this:  2010D320HR22MIN23
Which means the 320th day of Year 2010, Hour 22, Minute 23.
It may be equivalent to a string like this:
2010-10-19 22:23:00.0000000  
(Assuming 10-19 is the 320th day of 2010, I'm not sure if this is right)
So what I want is a function that takes 2010D320HR22MIN23 as input
and returns 2010-11-19 22:23:00.0000000  

I don't see any function that converts day of year to month and day. Is there one?  Or must one be built from scratch? Or is there another way of doing this?

Thanks,

C




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Question by:cipriano555
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Expert Comment

by:derekkromm
Comment Utility
declare @x varchar(100)
set @x = '2010D320HR22MIN23'

declare @y datetime
select @y = 
	dateadd(
		mi,
		convert(int,  right(@x, len(@x) - charindex('MIN', @x)-2)), 
		dateadd(
			hh, 
			convert(int, right(left(@x, charindex('MIN', @x)-1), len(left(@x, charindex('MIN', @x)-1)) - charindex('HR', @x)-1)), 
			dateadd(
				dd, 
				convert(int, right(left(@x, charindex('HR', @x)-1), len(left(@x, charindex('HR', @x)-1)) - 5)), 
				convert(datetime, '1/1/' + left(@x, 4)))))
select @y

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Accepted Solution

by:
derekkromm earned 500 total points
Comment Utility
Obviously replace all instances of @x with the name of your variable or description column.

And actually, a small error since it starts on 1/1/YY and adds days, it'll be 1 day too far ahead from that original query. Updated:

declare @x varchar(100)
set @x = '2010D1HR22MIN23'

declare @y datetime
select @y = 
	dateadd(
		mi,
		convert(int,  right(@x, len(@x) - charindex('MIN', @x)-2)), 
		dateadd(
			hh, 
			convert(int, right(left(@x, charindex('MIN', @x)-1), len(left(@x, charindex('MIN', @x)-1)) - charindex('HR', @x)-1)), 
			dateadd(
				dd, 
				convert(int, right(left(@x, charindex('HR', @x)-1), len(left(@x, charindex('HR', @x)-1)) - 5)) - 1, 
				convert(datetime, '1/1/' + left(@x, 4)))))
select @y

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Author Closing Comment

by:cipriano555
Comment Utility
Thank you so much for your help
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