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Full Discussion: Bash diff date doesn't work
Top Forums UNIX for Beginners Questions & Answers Bash diff date doesn't work Post 303007424 by Corona688 on Thursday 16th of November 2017 10:24:00 AM
Old 11-16-2017
The timestamps aren't 2 or more days apart yet, only 1.6 days. One counts from midnight while the other counts from present time.

Your proposition works by forcing both times to start from midnight. You could also add 86399 to d2 before division, which will force the value to 'round up'.
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LEARN ABOUT BSD

ac

AC(8)							      System Manager's Manual							     AC(8)

NAME

       ac - login accounting

SYNOPSIS

       /usr/sbin/ac [ -w wtmp ] [ -p ] [ -d ] [ people ] ...

DESCRIPTION

       Ac  produces a printout giving connect time for each user who has logged in during the life of the current wtmp file.  A total is also pro-
       duced.  -w is used to specify an alternate wtmp file.  -p prints individual totals; without this  option,  only	totals	are  printed.	-d
       causes  a printout for each midnight to midnight period.  Any people will limit the printout to only the specified login names.	If no wtmp
       file is given, /usr/adm/wtmp is used.

       The accounting file /usr/adm/wtmp is maintained by init and login.  Neither of these programs creates the file, so if it does not exist	no
       connect-time  accounting  is  done.  To start accounting, it should be created with length 0.  On the other hand if the file is left undis-
       turbed it will grow without bound, so periodically any information desired should be collected and the file truncated.

FILES

       /usr/adm/wtmp

SEE ALSO

       init(8), sa(8), login(1), utmp(5).

4th Berkeley Distribution					 November 16, 1996							     AC(8)
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