Convert ISO 8601 to unixtimestamp

Question

How can I convert 2012-01-18T11:45:00+01:00 (ISO 8601) to 1326883500 (unixtimestamp) in PHP?

Cohn

Answer 1

This code converts an ISO 8601 datetime to a Unix timestamp in UTC.

echo date("U",strtotime('2012-01-18T11:45:00+01:00'));

longer version:

$dateTime = new DateTime('2012-01-18T11:45:00+01:00');
$dateTime->setTimezone(new DateTimeZone('UTC'));
$utcTimestamp = $dateTime->getTimestamp();
echo $utcTimestamp;

Belligerence

@Cohn in this case no. i thought you may want to use another format of input/output – Belligerence

Answer 2

To convert from ISO 8601 to unixtimestamp :

strtotime('2012-01-18T11:45:00+01:00');
// Output : 1326883500

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To convert from unixtimestamp to ISO 8601 (timezone server) :

date_format(date_timestamp_set(new DateTime(), 1326883500), 'c');
// Output : 2012-01-18T11:45:00+01:00

To convert from unixtimestamp to ISO 8601 (GMT) :

date_format(date_create('@'. 1326883500), 'c') . "\n";
// Output : 2012-01-18T10:45:00+00:00

To convert from unixtimestamp to ISO 8601 (custom timezone) :

date_format(date_timestamp_set(new DateTime(), 1326883500)->setTimezone(new DateTimeZone('America/New_York')), 'c');
// Output : 2012-01-18T05:45:00-05:00

Ichnology

Very useful! Thanks much! – Roberson