I am on a machine with "GB" (i.e. British) localisation, and I see the following:

$ perl -e '$t=0; print scalar localtime $t, "\n"; print scalar gmtime 
+$t'
Thu Jan  1 01:00:00 1970
Thu Jan  1 00:00:00 1970

[download]

So localtime and gmtime return different values for time "0".

Now I'd expect localtime and gmtime to return the same thing in Britain outside of a daylight savings time period (which 1 January is).

I wondered whether this was because I didn't have a TZ variable set in my environment, but setting this to 'Europe/London' made no difference.

We don't get this discrepancy if we use the current time:

$ perl -e '$t=time; print scalar localtime $t, "\n"; print scalar gmti
+me $t'
Tue Feb  7 20:24:24 2023
Tue Feb  7 20:24:24 2023

[download]

This feels like a stupid question, I think I must be missing something obvious...

In reply to localtime gives unexpected result by Ghepardo

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.