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Homework and Emergencies Emergency UNIX and Linux Support Convert string to date and add 1 Post 302697675 by pamu on Friday 7th of September 2012 07:56:26 AM
Old 09-07-2012
Bug

Quote:
Originally Posted by cns1710
Hi All,

I want to convert string in format YYYYMMDD(20120607) to date in unix and add 1 day to it and convert back to string in format YYYYMMDD. Please help.
If you want just tomorrow's date try this..

Code:
date --date="tomorrow" +%Y%m%d

If you want to do by addition only then try this..

Code:
#to Unix date Conversion-
$ date -d "20120607" +%s
1339041600
#add one day - add 86400 for one day..
$ expr 1339041600 + 86400
1339128000
#Get back to the previous format
$date +"%Y%m%d" -d @1339128000
20120608

 

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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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