"first day of this year" is not implemented

[niravpateljoin]

Description

hello,

I encountered an issue with the following code:

<?php

echo (new DateTimeImmutable('first day of this year 00:00:00'))->format('Y-m-d H:i:s');

Resulted in this output:

2024-02-01 00:00:00

But I expected this output instead:

2024-01-01 00:00:00

Thank you.

PHP Version

PHP 8.2.15

Operating System

Ubuntu 22.04.3

[derickr]

The first day of phrase only works with months, or month names. It can currently not be combined with this year. This is in the documentation too: https://www.php.net/manual/en/datetime.formats.php#datetime.formats.relative
—
However, this is an often mentioned issues, so we probably should add this.

[heiglandreas]

As the gregorian calendar is used anyhow the request can be rewritten to first day of january as that will use the current year if no year is specified.

https://3v4l.org/fdmD1

Or this year Jan 1st 00:00:00

https://3v4l.org/at3gg

Also first day of january this year 00:00:00 seems to work

https://3v4l.org/vQAPT

[derickr]

This is a duplicate of #19684, which has additional context and stanzas.