Date/hour diff between two date/timestamps - however dataype in DB is curr varchar

Hi All
Could someone please help me?
I would like the T-SQL statement for hours passed between two date/timestamps within a table
e.g
Login_Time
22/02/2014 11:03:12.925297 AM (Data type in DB is varchar(50))
Logout_Time
22/02/2014 11:19:01.701073 AM (Data type in DB is varchar(50))
Thank you Kindly

DECLARE @dt AS VARCHAR(50)='22/02/2014 11:03:12.925297 AM'
DECLARE @dt1 AS VARCHAR(50)='22/02/2014 11:19:01.701073 AM'
SELECT DATEDIFF(hour,dt_from,dt_to) FROM
SELECT CAST(SUBSTRING(@dt,7,4)+ SUBSTRING(@dt,4,2)+SUBSTRING(@dt,1,2)+
SUBSTRING (@dt,11,17) AS DATETIME2) dt_from,
CAST(SUBSTRING(@dt1,7,4)+ SUBSTRING(@dt1,4,2)+SUBSTRING(@dt1,1,2)+
SUBSTRING (@dt1,11,17) AS DATETIME2) dt_to
) AS Der
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Diff between two date

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for ex in the above ex the diff etween two days is 1 day 1hr bla bla.......

Check that link... it will offer you a few alternatives:
http://www.orafaq.com/faq/how_does_one_get_the_time_difference_between_two_date_columns
HTH,
Thierry
with dates as (
select to_date('22-jan-2001 13:33:10', 'DD-MON-YYYY HH24:MI:SS') as date1,
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How to calculate the hour difference between two dates?

hi all,
how to calculate the hour difference between two dates?
eg i trying this...
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AAK

Hi
To break the diff between 2 dates into days, hours, minutes, sec -- you can use the following:
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trunc( mod( (sysdate-created)*24*60*60, 60 ) ) "Sec",
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(sysdate-created)*24 "Thr",
(sysdate-created)*24*60 "Tmi",
(sysdate-created)*24*60*60 "Tsec"
from all_users
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nicolas..
thanks for bringing this into my notice..
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nc(sysdate-(sysdate-45.4)))*24))*60)) "Second"
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This way?
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select 363810 , 144656 , to_timestamp('27-JUN-12 12.43.28.000000 PM', 'DD-MON-RR HH.MI.SS.FF6 AM') from dual union all
select 363500 , 144656 , to_timestamp('26-JUN-12 11.41.50.000000 AM', 'DD-MON-RR HH.MI.SS.FF6 AM') from dual union all
select 363354 , 144656 , to_timestamp('25-JUN-12 12.41.13.000000 PM', 'DD-MON-RR HH.MI.SS.FF6 AM') from dual
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A                      B                      DIFF
319415                 95831                  12
301927                 103509                 1
363500                 144656                 0
363810                 144656                 1

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long time = this.getTime() ; // gets milliseconds
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Hi James,
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There have been many posts asking how to get the
number of days between two dates. There is no method
in java like the VB method dateDiff(), and there is
only the method date.getTime() which gives you the
number of milliseconds since Jan 1 1970, the Epoch. I
have not seen a solution that makes use of the fact
that there are 86400000 milliseconds per day, only
when trying to get the number of days , i.e. multiples
of 24 hours between two millisecond points in time.
So what if date1 was Oct 26th 11.30pm and date2 was
Oct 27th 12.30am? If you get the millisecond
difference, and divide by 86400000, you do not notice
that these two times are on separate days, but only
one hour apart.
My solution takes account of the modulo (%) function.
If you use the date.getTime() method, and use %
86400000 on this number of milliseconds, it will tell
you how far (milliseconds) this date is into this day,
after 12am. If you subtract this amount from the total
number of milliseconds, then divide by 86400000, this
will give you the number of days after the Epoch, so
you are able to know which day the millisecond time is
in. If you want to know the days between two
millisecond times, this will tell you, whereas just
dividing by 86400000, will not, and may be
misleading.
I think this could be incorporated into the Date class
easily. There are some problems though, as not every
day has 86400000 milliseconds, if you are talking
about days when Daylight Saying Time begins or ends.
Doing calculations like that will create errors,
unless you know whether each date is in Daylight
Saving Time or not. Leap years are OK, unless want to
work out the number of years from the number of days
by dividing by 365, as calculating numbers of days is
only done by looking at a 24 hour time period. However
where 'leap seconds' have been added, like once every
ten years, there may be small errors. This was not
included in anyone elses calculations.
So the calculation would go like this:
public class BetterDate extends Date
public int dayDifference(Date d)
long time = this.getTime() ; // gets milliseconds
long timed = d.getTime() ; // gets milliseconds of
other date
int days = (time - (time % 86400000))/86400000 ; //
number of days
int daysd = (timed - (timed % 86400000))/86400000 ; //
number of days of other date
int difference = daysd - days ; // difference in days
between two dates
return difference ;
If you want you can use the value (time % 86400000),
and modulo this amount with the number of milliseconds
in one hour, then subtract the result from the (time %
86400000) and divide by the millliseconds in one hour
to give you the number of hours, but there are JDK
functions that you can use to get the hour if needed.
This method is not perfect, but for most cases will
get you the difference in days between two dates.
James

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Hi all,
Is there any function module to calculate difference between two dates/times which are in TIMESTAMPL format.
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Please, It is urgent
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hi,
try the following function
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try the following code to set the resolution to milliseconds..
SET RUN TIME CLOCK RESOLUTION LOW
check the thread for details:
SET RUN TIME CLOCK RESOLUTION?
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I have a question about the data type of the difference between two date type of datas.
There are two date type of datas as:
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Date/hour diff between two date/timestamps - however dataype in DB is curr varchar

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