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Full Discussion: Difference between two dates
Top Forums UNIX for Beginners Questions & Answers Difference between two dates Post 302995302 by drl on Tuesday 4th of April 2017 10:22:42 AM
Old 04-04-2017
Hi.

See package dateutils, which can be found in many repositories, and includes ddiff:
Code:
NAME
       ddiff  -  Compute  duration from DATE/TIME (the reference date/time) to
       the other

SYNOPSIS
       ddiff [OPTION]... DATE/TIME [DATE/TIME]...

DESCRIPTION
       Compute duration from DATE/TIME (the reference date/time) to the  other
       DATE/TIMEs  given  and  print  the  result  as  duration.  If the other
       DATE/TIMEs are omitted read them from stdin.
...
       Time specs:
         %H  Durations in hours
         %I  Equivalent to %H
         %M  Durations in minutes
         %S  Durations in seconds
...

Some additional details:
Code:
dateutils.ddiff Compute duration from DATE/TIME (the reference date/ti... (man)
Path    : /usr/bin/dateutils.ddiff
Version : 0.3.1
Type    : ELF 64-bit LSB shared object, x86-64, version 1 (S ...)
Help    : probably available with -h,--help
Home    : https://github.com/hroptatyr/dateutils

The package utilities take some practice to learn, but are very useful for dealing with almost any form of date and time data.

Best wishes ... cheers, drl

Last edited by drl; 04-04-2017 at 01:59 PM.. Reason: Correct minor typo (spelling).
 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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