Which date format is this? - php

Question

I want to convert this date-time string 2022-09-30T21:39:25.220185674Z to yyyy-mm-dd hh:mm:ss but it returns 1970-01-01 01:00:00 everytime.
Tried with: date('Y-m-d H:i:s', strtotime('2022-09-30T21:39:25.220185674Z')); or date('Y-m-d\TH:i:s', strtotime('2022-09-30T21:39:25.220185674Z'));
Can you help find out which format this is and how i could corretly format such string in PHP?
Went through this question or this one couldn't help.

Answer 1

It's a ISO 8601 datetime string with microseconds, where Z is the timezone "Zulu" or UTC + 0 hours.
ISO 8601 can be parsed with DateTime() like this:
$string = '2022-09-30T21:39:25.220185Z';
//create DateTime object
$date = date_create_from_format( "Y-m-d\TH:i:s.uP" , $string);
echo $date->format( 'Y-m-d H:i:s.u' );
However This will not work with your string, as the u parameter in the format "Y-m-d\TH:i:s.uP" which represents the microseconds, in PHP takes a maximum of 6 digits, and yours has 9.
You can resolve this by removing all above 6 digits from the microseconds part of the string with a regex, like
$string = '2022-09-30T21:39:25.220185674Z';
$new_string = preg_replace( '/^.*?\.\d{0,6}\K\d*/' , '' , $string );
$date = date_create_from_format( "Y-m-d\TH:i:s.uP" , $new_string );
echo $date->format('Y-m-d H:i:s.u');
Output: 2022-09-30 21:39:25.220180
The regex explained:
1. ^.*?\.\d{0,6} // select from the begin everything including the dot
// and max 6 digits
2. \K // forget the previous match and start again from the
// point where 1. ended
3. \d* // select all digits left
4. replace the match with ""

Answer 2

With '?' in the format, all digits after the 6th digit can be cut off.
$string = '2022-09-30T21:39:25.220185123Z';
$date = date_create_from_format( "Y-m-d\TH:i:s.u???P" , $string);
var_dump($date);
https://3v4l.org/Upm6v
As of PHP version 8.0.10, strings like '2022-09-30T21:39:25.220185674Z' are recognized by DateTime without any problems.
$str = '2022-09-30T21:39:25.220185674Z';
$d = new DateTime($str);
var_dump($d);
/*
object(DateTime)#1 (3) {
["date"]=>
string(26) "2022-09-30 21:39:25.220185"
["timezone_type"]=>
int(2)
["timezone"]=>
string(1) "Z"
}
*/
https://3v4l.org/pI4kO