Thanks for your reply!

The reason is that I'm doing timezone conversion. The code is supposed to be high-availability ... it is very bad if times get snookered even a couple times a year.

I'm using Date::Manip to perform the conversion. Date::Manip understands MST and MDT, but it does not understand something like MST7MDT. For example, 

#!/usr/bin/perl
use strict;
use Date::Manip;
my $date = &ParseDate("2002-05-29 08:00:00");
print "The unconverted date is [".&UnixDate($date,"%Y-%m-%d %H:%M:%S")
+."]\n";
my $from = 'MDT';
my $to = 'GMT';
my $converted = &Date_ConvTZ($date,$from,$to);
print "The conversion from [$from] resulted in [".&UnixDate($converted
+,"%Y-%m-%d %H:%M:%S")."]\n";
$from = 'MST7MDT';
$converted = &Date_ConvTZ($date,$from,$to);
print "The conversion from [$from] resulted in [".&UnixDate($converted
+,"%Y-%m-%d %H:%M:%S")."]\n";

[download]
gives 
The unconverted date is [2002-05-29 08:00:00]
The conversion from [MDT] resulted in [2002-05-29 14:00:00]
The conversion from [MST7MDT] resulted in [2002-05-29 08:00:00]

[download]

So I need to know whether a given date is in Mountain Daylight Time or Mountain Standard Time.

Edit by tye to change PRE tags to CODE tags

In reply to Re: Re: Determining Daylight Savings Time by Starky
in thread Determining Daylight Savings Time by Starky

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.