Solved

Convert char into datetime and calculate days and time elapsed

Posted on 2004-10-19
3
510 Views
Last Modified: 2012-05-05
I have a table with two date field in the format of YYYYMMDDhhmmss. Let's call these fields  timestamp1 and timestamp2. These fields is saved as varchar.I cannot modify the table.
In a view I need I need to find out the elapsed days and time between the two fields. For example:
if timestamp1 = 20041012010202 and timestamp2 = 20041013010103 the output needs to say:
days elapsed: 1 time elapsed: 01 second
I tried converting the fields first by saying: convert(datetime, fieldname, 20). This produces a syntax error. How to I convert these to a proper format (if necessary) and find out the elapsed days and times?
0
Comment
Question by:monkeyit
3 Comments
 
LVL 6

Accepted Solution

by:
gwalkeriq earned 125 total points
ID: 12353711
Not knowing exactly how you intend to use this, I did not bother making this a function or stored proc, but I show the code below that illustrates a means to accomplish your goals. I took the liberty of shortening the variable names to @s1, @s2 also

The code for determining 1 day + 1 second is also shown. You should change the if (@diff >= 0) to if (@diff > 0) if you want to suppress the hours and minutes. Anyway, you should get the idea I think.

Also, the make 1 day & 1 second, you need to correct the 2nd date string s I've shown below.

Finally, if you look at the definition of convert using format code 20/120, you will perhaps assume that the code below will not work since I don't embed formatting characters for the date. However, I've found  that the format characters for the date are optional in the convert function (but not for the time portion -- go figure)

set nocount on
declare @s1 as varchar(20), @s2 varchar(20)
select @s1='20041012010202', @s2='20041013010203'

declare @t1 datetime, @t2 datetime

select @t1 = convert(datetime, substring(@s1, 1, 8) + ' ' + substring(@s1, 9, 2) + ':' + substring(@s1, 11, 2) + ':' + substring(@s1, 13, 2), 120)
select @t2 = convert(datetime, substring(@s2, 1, 8) + ' ' + substring(@s2, 9, 2) + ':' + substring(@s2, 11, 2) + ':' + substring(@s2, 13, 2), 120)

-- this will show the values in datetime vars
select @t1, @t2

-- convert to days, hours, mins, secs
-- assumes @t1 <= @t2
declare @msg varchar(80)
declare @diff int

select @msg = ''
select @diff = datediff(d, @t1, @t2)
if (@diff >= 0)
begin
  select @msg = @msg + convert(varchar(8), @diff) + ' day(s) '
  select @t1 = dateadd(d, @diff, @t1)
  -- select str(@diff) + ' days', @t1, @t2
end

select @diff = datediff(hh, @t1, @t2)
if (@diff >= 0)
begin
  select @msg = @msg + convert(varchar(8), @diff) + ' hr(s) '
  select @t1 = dateadd(hh, @diff, @t1)
  -- select str(@diff) + ' hrs', @t1, @t2
end

select @diff = datediff(mi, @t1, @t2)
if (@diff >= 0)
begin
  select @msg = @msg + convert(varchar(8), @diff) + ' min(s) '
  select @t1 = dateadd(mi, @diff, @t1)
  -- select str(@diff) + ' mins', @t1, @t2
end

select @diff = datediff(ss, @t1, @t2)
if (@diff >= 0)
begin
  select @msg = @msg + convert(varchar(8), @diff) + ' sec(s) '
  select @t1 = dateadd(ss, @diff, @t1)
  -- select str(@diff) + ' secs', @t1, @t2
end

select @msg




0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

When you hear the word proxy, you may become apprehensive. This article will help you to understand Proxy and when it is useful. Let's talk Proxy for SQL Server. (Not in terms of Internet access.) Typically, you'll run into this type of problem w…
JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.
Via a live example, show how to extract insert data into a SQL Server database table using the Import/Export option and Bulk Insert.
Via a live example, show how to set up a backup for SQL Server using a Maintenance Plan and how to schedule the job into SQL Server Agent.

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question