PHP中的ISO日期时间

Question

I have an ISO DATETIME format parsed from web calendar ICS files. I have created calendar event in google and yahoo. In google, I have created for the time of 11:00 to 11:30 IST. In yahoo, I have created for the time of 11:30 to 11:45 IST.

I have received ICS files for both the events. My problem is with the event start time and end time in the ICS files.

Google Start time - 20140218T060000Z (provides GMT time)

Yahoo Start time - 20140218T113000Z (provides local time)

How can I check if the timezone in the ISO datetime is GMT and convert it to GMT if not? Please help me to achieve this. Thanks in advance.

Answer 1

There should be a timezone declaration in the ical file you can use.

The RFC places this on the DTSTART, for example:

DTSTART;TZID=America/New_York:19980119T020000

But ical is not a very exact "science", it seems like everybody uses it different. I've seen timezone declarations like this:

X-WR-TIMEZONE:Europe/Berlin

which only show up once in the ical file.

After creating a DateTime object you can use DateTime::setTimezone to set it. Example from the PHP documentation:

$date = new DateTime('2000-01-01', new DateTimeZone('Pacific/Nauru'));
echo $date->format('Y-m-d H:i:sP') . "
";

$date->setTimezone(new DateTimeZone('Pacific/Chatham'));
echo $date->format('Y-m-d H:i:sP') . "
";