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Top Forums Shell Programming and Scripting Need to minus one day from a date given Post 303000023 by bakunin on Monday 3rd of July 2017 05:44:36 AM
Old 07-03-2017
Quote:
Originally Posted by ektubbe
"date -d" is not supported in the version I am using
You don't need date -d for this type of things - use the TZ-variable (Time Zone) instead.

You see, time ist stored in "UTC" (universal time coordinated) in UNIX systems. the local time is just an offset from this, and this offset is set by the TZ variable, which you can change for a single command, for instance:

Code:
# TZ=GMT+1 date
Mon Jul  3 08:40:29 GMT 2017
# TZ=GMT+25 date
Sun Jul  2 08:40:37 GMT 2017

You see, adding/subtracting 24 to the TZ variable changes the output by 24 hours - which is a day. The same way you can get any arbitrary date, even in the future:

Code:
# TZ=GMT+1 date
Mon Jul  3 08:43:32 GMT 2017
# TZ=GMT+25 date
Sun Jul  2 08:43:32 GMT 2017
# TZ=GMT-23 date
Tue Jul  4 08:43:32 GMT 2017


I hope this helps.

bakunin
 

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DDATE(1)						    Emperor Norton User Command 						  DDATE(1)

NAME
ddate - convert Gregorian dates to Discordian dates SYNOPSIS
ddate [+format] [date] DESCRIPTION
ddate prints the date in Discordian date format. If called with no arguments, ddate will get the current system date, convert this to the Discordian date format and print this on the stan- dard output. Alternatively, a Gregorian date may be specified on the command line, in the form of a numerical day, month and year. If a format string is specified, the Discordian date will be printed in a format specified by the string. This mechanism works similarly to the format string mechanism of date(1), only almost completely differently. The fields are: %A Full name of the day of the week (i.e., Sweetmorn) %a Abbreviated name of the day of the week (i.e., SM) %B Full name of the season (i.e., Chaos) %b Abbreviated name of the season (i.e., Chs) %d Ordinal number of day in season (i.e., 23) %e Cardinal number of day in season (i.e., 23rd) %H Name of current Holyday, if any %N Magic code to prevent rest of format from being printed unless today is a Holyday. %n Newline %t Tab %X Number of days remaining until X-Day. (Not valid if the SubGenius options are not compiled in.) %{ %} Used to enclose the part of the string which is to be replaced with the words "St. Tib's Day" if the current day is St. Tib's Day. %. Try it and see. EXAMPLES
% ddate Sweetmorn, Bureaucracy 42, 3161 YOLD % ddate +'Today is %{%A, the %e of %B%}, %Y. %N%nCelebrate %H' Today is Sweetmorn, the 42nd of Bureaucracy, 3161. % ddate +"It's %{%A, the %e of %B%}, %Y. %N%nCelebrate %H" 26 9 1995 It's Prickle-Prickle, the 50th of Bureaucracy, 3161. Celebrate Bureflux % ddate +"Today's %{%A, the %e of %B%}, %Y. %N%nCelebrate %H" 29 2 1996 Today's St. Tib's Day, 3162. BUGS
ddate(1) will produce undefined behavior if asked to produce the date for St. Tib's day and its format string does not contain the St. Tib's Day delimiters %{ and %}. NOTE
After `X-Day' passed without incident, the Church of the SubGenius declared that it had got the year upside down - X-Day is actually in 8661 AD rather than 1998 AD. Thus, the True X-Day is Cfn 40, 9827. AUTHOR
Original program by Druel the Chaotic aka Jeremy Johnson (mpython@gnu.ai.mit.edu) Major rewrite by Lee H:. O:. Smith, KYTP, aka Andrew Bulhak (acb@dev.null.org) Five tons of flax. DISTRIBUTION POLICY
Public domain. All rites reversed. SEE ALSO
date(1), http://www.subgenius.com/ Malaclypse the Younger, Principia Discordia, Or How I Found Goddess And What I Did To Her When I Found Her AVAILABILITY
The ddate command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux Bureaucracy 3161 DDATE(1)
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