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Top Forums Shell Programming and Scripting Help needed-calculate previous date Post 302229659 by daytripper1021 on Wednesday 27th of August 2008 12:55:35 PM
Old 08-27-2008
try this

Quote:
Originally Posted by sureshg_sampat
Hi Friends,

Need a command/script in unix which calculates previous date [day -1] from current date.

For ex:
If current date= 01 Jan 2008, then output =31 Dec 2007
If current_date =01 Aug 2008 , then output= 31 July 2008

Please advice

Regards,
Suresh

Suresh,

I've been using this code in my shell-scripts. Try it if it works for you:

YDAY=`TZ=TAIST+16 date '+%Y%m%d'`

Smilie
 

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sttime(3)                                                   ShapeTools Toolkit Library                                                   sttime(3)

NAME
stMktime, stWriteTime - date and time handling SYNOPSIS
#include <config.h> #include <sttk.h.h> time_tstMktime (char *string); char*stWriteTime (time_t date); DESCRIPTION
stMktime scans the given string and tries to read a date and time from it. It understands various formats of date strings. The following is a list of all valid formats, optional parts in brackets. [Tue] Jan 5[,] [19]93 This includes the standard asctime(3) format. Jan 5 With no year given, the year defaults to the current year. [19]93/01/05 This notation requires month and day represented by exactly two digits. 5.1.[19]93 This is the usual German notation. 5.1. German notation referencing the current year. A certain time, given together with the date must always have the following form. hours:minutes[:seconds] Each of the fields must be an integer value within the proper range (hours: 0-23, minutes and seconds: 0-59). Values below 10 may be written as one digit numbers. The time value may be placed anywhere in the date string: at the beginning, at the end, or somewhere in the middle. Any amount of white- space may be given between a field of the time value and the separating colon. The time is always considered to be local time. stWriteTime generates a time string similar to asctime(3) from its date argument. SEE ALSO
asctime(3) BUGS
Time Zone Names within the time string (like `MET') are not handled properly. In most cases they will cause a failure. sttk-1.7 Thu Jun 24 17:43:35 1993 sttime(3)
All times are GMT -4. The time now is 10:46 PM.
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