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TZ=TZ+28 => date -24hrs with EST5EDT,M03.2.0,M11.1.0 ?

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Operating Systems AIX TZ=TZ+28 => date -24hrs with EST5EDT,M03.2.0,M11.1.0 ?
# 1  
Old 06-13-2009
TZ=TZ+28 => date -24hrs with EST5EDT,M03.2.0,M11.1.0 ?
I am trying to find a sure way to get yesterday's date considering that the local time is Montreal Canada.

The current TZ value is EST5EDT,M03.2.0,M11.1.0 on a AIX 4.2

I am wondering if adding 28 to the TZ (in a script) is a sure way even if we change the time in Spring and Fall. The script can be run anytime.

We do not have GNU Date and knowing the client, he might reject the idea of adding any software to the system even if it is Open Source.
# 2  
Old 06-13-2009
I have no system with such an old AIX version at hand, but in an AIX 5.3 system it worked - in a way. See the following terminal session printout for a hint:

Code:
# instfix -i | grep ML
    All filesets for 5.3.0.0_AIX_ML were found.
    All filesets for 5300-01_AIX_ML were found.
    All filesets for 5300-04_AIX_ML were found.
    All filesets for 5300-05_AIX_ML were found.
    All filesets for 5300-06_AIX_ML were found.
    All filesets for 5300-07_AIX_ML were found.
    No filesets which have fixes for 5300-03_AIX_ML are currently installed.
    All filesets for 5300-02_AIX_ML were found.
    All filesets for 5300-08_AIX_ML were found.
    All filesets for 5300-09_AIX_ML were found.

# print - $(TZ=EST5EDT,M03.2.0,M11.1.0; date)   
Sat Jun 13 11:19:47 EDT 2009

NOTE: So far, this is normal and to be expected. But i noticed, that arithmetics involving numbers revert all
      TZ-codes back to CUT. See the following four commands. There is no difference between "CUT+28", "+28"
      and "EST5EDT+28".

# print - $(TZ=EST5EDT+24,M03.2.0,M11.1.0; date)
Fri Jun 12 15:19:54 EDT 2009
# print - $(TZ=EST5EDT+28,M03.2.0,M11.1.0; date)
Fri Jun 12 11:20:21 EDT 2009
# print - $(TZ=CUT+28,M03.2.0,M11.1.0; date)    
Fri Jun 12 11:20:56 CUT 2009
# print - $(TZ=+28,M03.2.0,M11.1.0; date)   
Fri Jun 12 11:21:09 2009

Now, i am not root on this machine and can't therefore change the date. You could easily try these commands on a test system you have control over and play with the system date to find out if the DST-settings are being honored or not.

The way i put the commands does limit the changed TZ-setting to the single invocation of "date" each.

I hope this helps.

bakunin
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