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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 SUSE

time::julianday

Time::JulianDay(3)					User Contributed Perl Documentation					Time::JulianDay(3)

NAME

       Time::JulianDay -- Julian calendar manipulations

SYNOPSIS

	       use Time::JulianDay

	       $jd = julian_day($year, $month_1_to_12, $day)
	       $jd = local_julian_day($seconds_since_1970);
	       $jd = gm_julian_day($seconds_since_1970);
	       ($year, $month_1_to_12, $day) = inverse_julian_day($jd)
	       $dow = day_of_week($jd)

	       print (Sun,Mon,Tue,Wed,Thu,Fri,Sat)[$dow];

	       $seconds_since_jan_1_1970 = jd_secondslocal($jd, $hour, $min, $sec)
	       $seconds_since_jan_1_1970 = jd_secondsgm($jd, $hour, $min, $sec)
	       $seconds_since_jan_1_1970 = jd_timelocal($sec,$min,$hours,$mday,$month_0_to_11,$year)
	       $seconds_since_jan_1_1970 = jd_timegm($sec,$min,$hours,$mday,$month_0_to_11,$year)

DESCRIPTION

       JulianDay is a package that manipulates dates as number of days since some time a long time ago.  It's easy to add and subtract time using
       julian days...

       The day_of_week returned by day_of_week() is 0 for Sunday, and 6 for Saturday and everything else is in between.

ERRATA

       Time::JulianDay is not a correct implementation.  There are two problems.  The first problem is that Time::JulianDay only works with
       integers.  Julian Day can be fractional to represent time within a day.	If you call inverse_julian_day() with a non-integer time, it will
       often give you an incorrect result.

       The second problem is that Julian Days start at noon rather than midnight.  The julian_day() function returns results that are too large by
       0.5.

       What to do about these problems is currently open for debate.  I'm tempted to leave the current functions alone and add a second set with
       more accurate behavior.

       There is another implementation in Astro::Time that may be more accurate.

GENESIS

       Written by David Muir Sharnoff <muir@idiom.com> with help from previous work by Kurt Jaeger aka PI <zrzr0111@helpdesk.rus.uni-stuttgart.de>
	    based on postings from: Ian Miller <ian_m@cix.compulink.co.uk>; Gary Puckering <garyp%cognos.uucp@uunet.uu.net>	 based on
       Collected Algorithms of the ACM ?; and the unknown-to-me author of Time::Local.

LICENSE

       Copyright (C) 1996-1999 David Muir Sharnoff.  License hereby granted for anyone to use, modify or redistribute this module at their own
       risk.  Please feed useful changes back to muir@idiom.com.

perl v5.12.1							    2004-02-08							Time::JulianDay(3)
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