PHP and JS convert same date differently

Question

PHP:

$start_time = '2020-06-23T22:30:00Z';
$timezone = new DateTimeZone("Australia/Sydney");
$date1 = new DateTime($start_time, $timezone);
$result = $date1->format('Y-m-d H:i:s');
echo $result; // 2020-06-23 22:30:00

JS (matches what I have set):

var date1 = new Date('2020-06-23T22:30:00Z')
console.log(date1) // Wed Jun 24 2020 08:30:00 GMT+1000 (Australian Eastern Standard Time)

What am I doing wrong here?

@RiggsFolly, the trailing Z flag does not indicate Zulu time, but that it's a UTC time string - reference — Klaycon
– Klaycon, Commented Jun 23, 2020 at 17:03
@Klaycon Correct, sorry! However if you put UTC time into js in a browser it will use the timezone in the browser to rearrange the date/time according to timezone — RiggsFolly
– RiggsFolly, Commented Jun 23, 2020 at 17:10
@Klaycon— "Zulu", "Z" and "UTC" (and even GMT) are effectively all the same thing: zero offset. They don't tell you anything about the format of the string. — RobG
– RobG, Commented Jun 23, 2020 at 22:24

aynber · Accepted Answer · 2020-06-23 16:58:50Z

4

Passing the timezone into the DateTime constructor will override the Z flag on your time string. Create the object without the timezone, then set it afterwards:

$date1 = new DateTime($start_time); 

// object(DateTime)(
//   'date' => '2020-06-23 22:30:00.000000',
//   'timezone_type' => 2,
//   'timezone' => 'Z'
// )

 $date1->setTimezone($timezone);
// object(DateTime)(
//   'date' => '2020-06-24 08:30:00.000000',
//   'timezone_type' => 3,
//   'timezone' => 'Australia/Sydney'
// )

answered Jun 23, 2020 at 16:58

aynber

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1 Comment

TKoL Over a year ago

smart. I've always wondered how I'd have to deal with dates if I ever lived anywhere other than GMT

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