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Top Forums UNIX for Beginners Questions & Answers How bash treats literal date value and retrieve year, month and date? Post 302991551 by drl on Monday 13th of February 2017 10:58:06 AM
Old 02-13-2017
Hi.

Depending on your OS, shell, etc. (which you forgot to post), and level of expertise, one or more of hte following may be of interest. I often use dateutils ... cheers, drl

Code:
Date, time arithmetic, math

        1) gnu date

        2) ksh ( version 93, not 88; ksh93 M 93t+ ) printf, e.g:
           printf "%(%Y-%m-%d)T\n" "yesterday"

        3) date.pl (limited arithmetic, but "date.pl -d '- 1 day'" works)
           ( https://www.unix.com/tips-tutorials/
           239167-general-purpose-date-script.html)

        4) dconv et al, e.g. ddiff, dconv, strptime (parsing), etc.
           ( dateutils: http://www.fresse.org/dateutils/ )

        5) tm2tm (, OK in 32-bit; fails to compile in 64-bit)
           ( https://www.unix.com/shell-programming-scripting/
           146216-date-difference-between-freebsd-linux.html#post302463136 )

        6) perl custom formatting (with function POSIX::strftime, "perldoc POSIX")

        7) date-cpan.pl, cpan perl date
           ( http://cpansearch.perl.org/src/CWEST/ppt-0.14/src/date/date.jgross )

        8) For small changes, say, "yesterday" in bash, ksh
           TZ=CST+24 date +%Y%m%d
           csh, tcsh
           setenv TZ CST+24 ; date +%Y%m%d

        9) Check for legal date:
           manstat:validata ( http://oldwww.acm.org/perlman/stat/ )

        10) Check for legal date:
            validate (local perl code)

        11) Shell, ksh, date calculations:
            www.unix.com/unix-for-dummies-questions-and-answers/4870-days-elapsed-between-2-dates.html

 

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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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