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From: "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups: comp.lang.php
Subject: Days until Christmas (was: its quiet here - test)
Date: Thu, 26 Oct 2017 19:29:49 +0200
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On 26.10.2017 at 19:02, Mark Lloyd wrote:

> On 10/26/2017 04:51 AM, Luuk wrote:
> 
> [snip]
> 
>> LOLm where do you in this '62 days' consider those 25 hours?
> 
> Once I have the 2 times in seconds (now and later), I determine is DST
> (Damn Stupid Time, it really makes time calculations more complicated
> for no actual benefit) is active for each of them. This is done using
> the PHP date function; date('I', $time).
> 
> If DST is active later but not now, add the DST offset to the interval.
> 
> If DST is active now but not later, subtract the DST offset from the
> interval.
> 
> "DST offset" is usually 3600 (60*60 for "add 1 hour"), unless you live
> on Lord Howe Island (1800) or Troll Station, Antarctica (7200);
> 
> The interval is now ready to be converted to days by dividing by 86400.

That appears to be overly complicated.  Wouldn't

  (new DateTime('now'))
    ->diff(new DateTime('2017-12-25T00:00'))
    ->format('%a days until Christmas')

suffice?  Okay, that rounds down, and your solution rounds up, but that
could be catered to.

-- 
Christoph M. Becker