DateTime::createFromTimestamp overflowed microseconds value

[ranvis]

Description

The following code:

<?php
echo DateTime::createFromTimestamp(0.999_999_9)->format('s.u'), "\n";

Resulted in this output:

00.1000000

But I expected this output instead:

01.000000 or 00.999999

Though some don't agree, I prefer to 00.999999 than 01.000000 for date and time.
23:59:59.999_999_9 is not technically tomorrow.

PHP Version

dev-master 5e242fe

Operating System

irrelevant

[hormus]

If 1000000 microsecond (1 sec).
0.999_999_9 sec 0 and 999999 microsecond 'U' (6 digit).
Correct 0 sec, 999999 microsecond for output timezone UTC:

1970-01-01 00:00:00.999999

Don't supported Date and Time Formats sec.microseconds but @sec.microseconds

<?php
$param = 0.99999;
$date = new DateTime($param);
var_dump($date);
?>

Date and Time list format
https://www.php.net/manual/en/datetime.formats.php

@ranvis you maybe use carbon::createFromTimestamp it's not core PHP.

[ranvis]

@hormus
IDK but if you couldn't run the repro of mine, we should be talking about different versions.

[SakiTakamachi]

@ranvis
I was able to reproduce this, so I opened the PR.
#14463