12-01-2010
Somebody here may give you a simple subtraction algorithm -- which will fail sometimes. What you need is something more robust.
What DBMS are you using? - many of them provide date subtraction that works reliably.
Plus you can get date/times in formats like Julian days which are floating point numbers.
You can use bc to do the arithmetic operation on these numbers
The reason for waffling is that you have to convert both dates into something like epoch seconds, then subtract, and return days, hours, minutes & seconds. You can do this in perl. It is just loads easier inside most modern dbms. Plus your perl may not have DateTime::Format::strptime.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi All,
Wish you a Happy New year...
I have to find the difference between two dates, the result should be the number of days. I have seen the "datecalc" function. Its good, can I have any other alternative.
Thanks in Advance
Raju (4 Replies)
Discussion started by: rajus19
4 Replies
2. Shell Programming and Scripting
Hi all.
My question may seems to be similar to one that already been here. But i need a little other solution.
I have two dates in format dd/mm/yyyy. I need to find number of days between them. I need to do it in bash script.
I am running on Solaris machine and have cutted 'date' command version... (1 Reply)
Discussion started by: kukuruku
1 Replies
3. Shell Programming and Scripting
Hi!
I have two parameters like this: YYYY-MM-DD YYYY-MM-DD
My question is, there is a direct command for get the elapsed time between the 2 dates, or I have to find another way?
Thx! (1 Reply)
Discussion started by: MalaTomi
1 Replies
4. Shell Programming and Scripting
hi all,
I need a help for below requirement.
Difference between two dates"12-11-2009" and "03-25-2012" (mm-dd-yy format") in weeks and days and hours
Please help me for this. Thanks in adv....
I am working in AIX, so dont have below command:-
date --version (2 Replies)
Discussion started by: gani_85
2 Replies
5. Shell Programming and Scripting
shell script to calculate difference between 2 dates (3 Replies)
Discussion started by: gredpurushottam
3 Replies
6. Shell Programming and Scripting
Hi Guys,
Need a small help, how do i get the difference between two dates (in days) in KSH shell
My date is in mm/dd/YYYY format,
Is there a function to get time stamp from the respective date and time ( mm/dd/yyyy HH:MM:SS) (1 Reply)
Discussion started by: selvankj
1 Replies
7. Shell Programming and Scripting
Hi Friends,
I have a file that has the contents like below:
file1.txt
5,13/07/2013 23:25:25,14/07/2013 19:40:21
5,13/07/2013 23:25:25,14/07/2013 19:40:43
5,12/07/2013 23:50:50,13/07/2013 20:30:26
5,12/07/2013 23:20:24,13/07/2013 19:40:53
60,14/07/2013 00:00:00,14/07/2013 23:00:39... (5 Replies)
Discussion started by: vsachan
5 Replies
8. Shell Programming and Scripting
Hi All,
I have a date variable say dt="2014-01-06 07:18:38"
Now i need to use this variable to search a log and get the entries which occured after that time. (1 Reply)
Discussion started by: Girish19
1 Replies
9. Fedora
I have a script which is printing date in below format while writing the logs.
theDate=`date +"%m%d%Y"`
theTime=`date +"%H%M%S"`
echo $theDate $theTime
How can i find out difference current time and above format. Appreciate your help. (6 Replies)
Discussion started by: srikanth38
6 Replies
10. UNIX for Beginners Questions & Answers
Hi There
I am trying to find the difference between two dates in seconds, by taking the first 10 digits of the file name itself, which I have done as shown below:
current_time=`date +%s`
last_login_of_tim=`date -d @1489662376 +%s`
diff_sec=$(($current_time-$last_login_of_tim))
... (5 Replies)
Discussion started by: simpsa27
5 Replies
DP(8) [nmh-1.5] DP(8)
NAME
dp - parse dates 822-style
SYNOPSIS
/usr/lib/mh/dp [-form formatfile] [-format string] [-width columns] [-version] [-help] dates ...
DESCRIPTION
Dp is a program that parses dates according to the ARPA Internet standard. It also understands many non-standard formats, such as those
produced by TOPS-20 sites and some UNIX sites using ctime(3). It is useful for seeing how nmh will interpret a date.
The dp program treats each argument as a single date, and prints the date out in the official 822-format. Hence, it is usually best to
enclose each argument in quotes for the shell.
To override the output format used by dp, the -format string or -format file switches are used. This permits individual fields of the
address to be extracted with ease. The string is simply a format string and the file is simply a format file. See mh-format(5) for the
details.
Here is the default format string used by dp:
%<(nodate{text})error: %{text}%|%(putstr(pretty{text}))%>
which says that if an error was detected, print the error, a `:', and the date in error. Otherwise, output the 822-proper format of the
date.
FILES
$HOME/.mh_profile The user profile
PROFILE COMPONENTS
None
SEE ALSO
ap(8), Standard for the Format of ARPA Internet Text Messages (RFC-822)
DEFAULTS
`-format' default as described above
`-width' default to the width of the terminal
CONTEXT
None
BUGS
The argument to the -format switch must be interpreted as a single token by the shell that invokes dp. Therefore, one must usually place
the argument to this switch inside quotes.
MH.6.8 11 June 2012 DP(8)