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Doc Bug #76569 Description of “!” And “|” of DateTime::createFromFormat
Submitted: 2018-07-02 22:59 UTC Modified: 2019-01-02 00:47 UTC
Votes:2
Avg. Score:3.0 ± 2.0
Reproduced:2 of 2 (100.0%)
Same Version:1 (50.0%)
Same OS:1 (50.0%)
From: manabu dot matsui at gmail dot com Assigned:
Status: Open Package: Date/time related
PHP Version: Irrelevant OS: N/A
Private report: No CVE-ID: None
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 [2018-07-02 22:59 UTC] manabu dot matsui at gmail dot com
Description:
------------
At http://php.net/manual/en/datetime.createfromformat.php, description of format character “!” And “|” are as follows:

“!”
Resets all fields (year, month, day, hour, minute, second, fraction and timezone information) to the Unix Epoch

“|”
Resets all fields (year, month, day, hour, minute, second, fraction and timezone information) to the Unix Epoch if they have not been parsed yet

And in the rest of this document, the UNIX epoch is explained as follows:

> The Unix epoch is 1970-01-01 00:00:00 UTC.

But actually, they appear to reset to 1970-01-01 00:00:00 in the resulting timezone, not UTC.

% php -d date.timezone=Asia/Tokyo -r 'var_dump(DateTime::createFromFormat("!", ""));'
object(DateTime)#1 (3) {
  ["date"]=>
  string(26) "1970-01-01 00:00:00.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(10) "Asia/Tokyo"
}
% php -d date.timezone=Asia/Tokyo -r 'var_dump(DateTime::createFromFormat("!", "")->getTimestamp());'
int(-32400)
% php -r 'var_dump(DateTime::createFromFormat("!", "", new DateTimeZone("Asia/Tokyo")));'
object(DateTime)#2 (3) {
  ["date"]=>
  string(26) "1970-01-01 00:00:00.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(10) "Asia/Tokyo"
}

Since the current behavior is more useful, I think this is a problem of documentation.


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 [2018-11-10 16:33 UTC] salmanarshad2000 at yahoo dot com
I have noticed the same behavior and agree that the documentation needs to be corrected. The documentation seems to suggest that including ! or | inside the format string will result in a datetime with UTC / +00:00 timezone e.g.:

object(DateTime)#1 (3) {
  ["date"]=>
  string(26) "2000-01-01 00:00:00.000000"
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}

Or:

object(DateTime)#1 (3) {
  ["date"]=>
  string(26) "2000-01-01 00:00:00.000000"
  ["timezone_type"]=>
  int(2)
  ["timezone"]=>
  string(3) "UTC"
}

But it does not produce the result I assumed by reading the documentation.

Other: the documentation also examples of using "|" and how it differs from "!".
 [2019-01-02 00:47 UTC] girgias@php.net
-Package: Documentation problem +Package: Date/time related -Operating System: Irrelevant +Operating System: N/A
 
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