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display previous one day's date using SUN Solaris 7

Posted on 2002-03-06
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Last Modified: 2013-12-05
Hi!
I have some UNIX script need to help from you all experts.
How do display previous one day's using UNIX script on SUN Solaris?
The date of type display is YYMMDD

E.g: (1) "For display today date"
#date
Thu Mar  7 13:36:12 SGT 2002
 
E.g: (2) "For display today date with type YYMMDD"
#date -u '+%y%m%d'
020307

How to display the date on one day before current day?
I meant if today is 020307 (2002 March 07), when I type the command it should be display: 020306 (2002 March 6).

Thank you very much!
Geoffry.
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Question by:geoffry
7 Comments
 
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Expert Comment

by:SunBow
ID: 6847740
Change the clock.
If your application needs that so badly from OS, for example, to simulate being in another country, another time zone, etc., then best to just configure the server as if it was located in the area being serviced. That gets around a few other problems, such as TZ & DST.

If not, just a cosmetic for application, then the tools of the application should modify it, and not require any hacks to the OS clock.
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by:SunBow
ID: 6847743
(not to mention synchronization and networking communication)
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Expert Comment

by:newmang
ID: 6848573
Can you explain the situation where you need this function as the way to do it would depend on why you want to do it.
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Accepted Solution

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ahoffmann earned 300 total points
ID: 6852675
env TZ=GMT+24 date +%y%m%d
# assuming that your TZ is GMT
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Expert Comment

by:mbreuer
ID: 6861677
Don't know if the standard sun date routine has this... linux does:

date --date=yesterday works for me.  You could use the gpl'd date routine and compile on solaris if not already supported.
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by:ahoffmann
ID: 6862656
--date is a GNU option;
My TZ suggestion works on any flaviour of UNIX/Linux for at least 24 hours timeshift (up to .. I don't realy know, depends on UNIX ;-)
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Author Comment

by:geoffry
ID: 6887526
Thank you very much!
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