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Full Discussion: date substraction
Top Forums Shell Programming and Scripting date substraction Post 302499785 by kshji on Friday 25th of February 2011 11:17:49 AM
Old 02-25-2011
Using gnu date
Code:
from="20100401" 
to="20100503" 
start=$(date --date="$from" +"%s") 
end=$(date --date="$to" +"%s") 
days=$(( (end - start) / 86400 )) 
echo $days 

from="04/01/11" 
to="05/03/11" 
start=$(date --date="$from" +"%s") 
end=$(date --date="$to" +"%s") 
days=$(( (end - start) / 86400 )) 
echo $days

Using ksh93 builtin printf
Code:
((day=24*60*60))  # 86400 s
fromdate="04/01/11"
todate="05/03/11"
# datestr => epoc 
epoc1=$(printf "%(%#)T" "$fromdate") 
epoc2=$(printf "%(%#)T" "$todate") 
# length of day (seconds) = 86400 
echo $(( (epoc2-epoc1) /day)) 

fromdate="2011-04-01"
todate="2011-05-03"
# datestr => epoc 
epoc1=$(printf "%(%#)T" "$fromdate") 
epoc2=$(printf "%(%#)T" "$todate") 
echo $(( (epoc2-epoc1) /day))

Or using calculating like panyam.

More about calculating
Is there a formula for calculating the Julian day number?

You can do panyam solution without any external commands, using builtin in every posix compatible shells (bash, ksh93, dash, ...)
Code:
get_JD()
{
        d="$1"
        m="$2"
        y="$3"
        echo $(( d-32075+1461*(y+4800+(m-14)/12)/4+367*(m-2-(m-14)/12*12)/12-3*((y+4900+(y-14)/12)/100)/4 ))
}

first=$( get_JD 1 4 2011 )       # day month year
second=$( get_JD 4 5 2011 )
diff=$((second - first))
echo $diff

Last edited by kshji; 02-26-2011 at 05:20 AM..
 

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LEARN ABOUT OPENSOLARIS

ds.log

ds.log(4)							   File Formats 							 ds.log(4)

NAME

       ds.log - Availability Suite data services log file

DESCRIPTION

       The  /var/adm/ds.log file contains the Availability Suite data services command log. The administration commands log activities to the file
       in the format:

	 date time product: message

       Note that when the size of the log file exceeds 10 Mbytes, ds.log is renamed  /var/adm/ds.log.bak  and a new /var/adm/ds.log file  is  cre-
       ated.

       The ds.log fields are:

       date

	   The	date format is mmm nn, where mmm  is  the local three-character abbreviation for the month and nn is the day of the month on which
	   the event occurred.

       time

	   The time of the event, in hh:mm:ss format.

       product

	   A product code that identifies which component of the data services produced the event. The code is separated  from	the  message  that
	   follows by a colon (:) and a space.

       message

	   A  message  that  can extend over  more  than  one  line describing the event that occurred. The second or following lines are not pre-
	   fixed by  the  date, time, and product code strings.

EXAMPLES

       The example below shows sample ds.log file content:

	 Jan 25 05:26:17 ii: iiboot suspend cluster tag <none>
	 Jan 25 05:32:02 ii: iiboot resume cluster tag <none>
	 Jan 25 05:32:04 sv: svboot: resume /dev/vx/rdsk/bigmaster
	 Jan 25 05:32:04 sv: svboot: resume /dev/vx/rdsk/bigshadow
	 Jan 25 05:32:04 sv: svboot: resume /dev/vx/rdsk/mstvxfs
	 Jan 25 05:32:04 sv: svboot: resume /dev/vx/rdsk/master01

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +---------------------+---------------------------------------------------------+
       |   ATTRIBUTE TYPE    |			   ATTRIBUTE VALUE		       |
       +---------------------+---------------------------------------------------------+
       |Architecture	     | x86						       |
       +---------------------+---------------------------------------------------------+
       |Availability	     | SUNWscmu 					       |
       +---------------------+---------------------------------------------------------+
       |Interface Stability  | Committed					       |
       +---------------------+---------------------------------------------------------+

SEE ALSO

       iiadm(1M), sndradm(1M), svadm(1M), attributes(5)

SunOS 5.11							    08 Jun 2007 							 ds.log(4)
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