Actually I don't think the statement (that parent's code will produce an incorrect time during DST) is correct but neither do I think Robin's surmise that the code in Re: How to convert time from one time zone to another will "work on Windows" is universally correct. Under Windows7: 
#!/usr/bin/perl
use 5.014;
# convert TZ 

say "\$ENV{TZ}: $ENV{TZ}";     # var had to be manually added on stock
+ W7


{
    local $ENV{TZ} = "EST+05";
    say "In New York, it is " . localtime();
}

{
    local $ENV{TZ} = "IST-05:30";                  # does not return c
+orrect time on W7
    say "In Mumbai, it is " . localtime();         # but, rather, same
+ as NY localtime
}

[download]

outputs:

$ENV{TZ}: EST5EDT                            # TZ is set but this does
+ 
                                             # not appear to be defaul
+t (for Win7)
In New York, it is Mon Apr  2 10:41:23 2012  # correct
In Mumbai, it is Mon Apr  2 10:41:23 2012    #obviously wrong

[download]

But this may be the result of a misconception on my part about 'doze ENV and its vars.
    Anyone care to explicate?

In reply to Re^3: How to convert time from one time zone to another by ww
in thread How to convert time from one time zone to another by rameshps

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.