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Full Discussion: date command issue from crontab
Top Forums Shell Programming and Scripting date command issue from crontab Post 302426390 by methyl on Tuesday 1st of June 2010 06:43:29 PM
Old 06-01-2010
Mumbai time is UTC/GMT plus 5:30.
01:00 in Mumbai is 19:30 Greenwich Mean Time (GMT) "yesterday".

Assuming that your cron runs in Mumbai Time the definition of "yesterday" and "day-before-yesterday" when expressed in Greenwich Mean Time (GMT) changes according to the time parameter of the crontab entry.

I don't think that changing the TZ variable in this manner is a valid technique outside of the GMT timezone. You need to be working in the same timezone as cron.

Depending on what Operating System and Shell you have there are published techniques for date arithmetic for non-GMT timezones.

Alternatively you could test the cron every hour for 24 hours and use this information to work out a simple adjustment.

Afterthought. You could create a cron for 00:01 to create a file for "today" and age the file daily to produce "yesterday" and "day-before-yesterday". With forward planning you will have all the reference dates available after three days. The content of each file can be the output from "date" in whatever format you require. This will be a lot less hassle than date arithmetic.
Last edited by methyl; 06-01-2010 at 08:27 PM.. Reason: afterthought
 

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LEARN ABOUT PLAN9

yesterday

YESTERDAY(1)						      General Commands Manual						      YESTERDAY(1)

NAME

       yesterday - print file names from the dump

SYNOPSIS

       yesterday [ -c ] [ -date ] files ...

DESCRIPTION

       Yesterday prints the names of the files from the most recent dump.  Since dumps are done early in the morning, yesterday's files are really
       in today's dump.  For example, if today is March 17, 1992,

	      yesterday /adm/users

       prints

	      /n/dump/1992/0317/adm/users

       In fact, the implementation is to select the most recent dump in the current year, so the dump selected may not be from today.

       With option -c, yesterday copies the dump file to the current directory.

       The date option selects other day's dumps, with a format of 2, 4, 6, or 8 digits of the form dd, mmdd, yymmdd, or yyyymmdd.

       Yesterday does not guarantee that the string it prints represents an existing file.

EXAMPLES

       Back up to yesterday's MIPS binary of vc:

	      cd /mips/bin
	      yesterday -c vc

       Temporarily back up to March 1's MIPS C library to see if a program runs correctly when loaded with it:

	      bind `{yesterday -0301 /mips/lib/libc.a} /mips/lib/libc.a
	      rm v.out
	      mk
	      v.out

FILES

       /n/dump

SOURCE

       /rc/bin/yesterday

SEE ALSO

       fs(4)

BUGS

       It's hard to use this command without singing.

																      YESTERDAY(1)
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