How to convert date timezone in unx

Which is your OS? If you have GNU date:

yesterday=$(date -d "yesterday" "+%Y%m%d%H%M")

Hi Expert

My OS is "SunOS 5.10"

Thanks
Chanikya.

GNU date is in the "coreutils" package, available for Solaris here:

http://www.sunfreeware.com/indexsparc10.html

I am sorry, I can not do anything at OS level installation/upgradation/patch etc..

I have to just make use of existing features.

Thanks
Chanikya.

if your locale implements Daylight Saving Time
there may be 2 hours per year when
  time()-86400
is not yesterday

Good point!

Hi  ozo,

My Problem is, i need to find out yesterday date. And it is working for me
yesterday=`TZ=GMT+28 date +%Y%m%d%H%M`.

Here you see GMT+28 =GMT+24+4 . The server is in phildelphia (EST time zone) i.e. in GMT -4.00 hrs.  Hence Adding 4 to 24 hours to get the correct output .

After few months once day light saving changes i have to manually change the script .
yesterday=`TZ=GMT+26.5 date +%Y%m%d%H%M`.   Becuase it will become GMT - 2.50 hrs .

Then it gives the correct output.

But i donot want to change it manually.

Hope it will clear my problem.

Thanks
Chanikya.

Did you try my perl solution?

As long as you don't run your script during those 2 x 1.5 hours of DST transition it will work just fine.

perl -e '@t=localtime;@y=localtime(time()-86400+(12-$t[2])*3600);printf "%04d%02d%02d%02d%02d",$y[5]+1900,$y[4]+1,$y[3],$t[2],$t[1]'

Hi  woolmilkporc,

I have tried your option . but do you think it will work even day light saving changes. Because i can not test now..

Hi ozo,

I have to use that code in my shell script. you mean can i use the above command which you sent.

Thanks
Chanikya.

It will work regardless of DST being in effect or not.

Both are more or less like similar solutions I am accepting both the solutions. But woolmilkporc suggested the first perl solution.

Thanks,
Chanikya.