Daylight savings

[rlanvin]

Daylight savings

[rlanvin]

This is a good question, and admittedly the behavior can be a bit confusing.

If you ask the lib to produce occurrences at a certain time in a certain timezone (say, 14:30 in America/Toronto), all the results will be at 14:30 in America/Toronto. The actual offset with UTC doesn't matter. Say for example you have meeting every Monday at 8am. It'll still be at 8am during DST, won't it?

You can achieve the behavior you are a describing if you set the DTSTART in UTC and convert the occurrences on the fly. Because then the lib will work with absolute UTC times, but the meaning of the time in your local timezone (America/Toronto) will change based on the date. Example:

$rrule = new RRule(
	'RRULE:FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR,SA,SU;UNTIL=20180331T000000Z',
	date_create('2018-03-10 13:30:00', new DateTimeZone('America/Toronto'))->setTimeZone(new DateTimeZone('UTC')) // force the start in UTC
);

foreach ( $rrule as $occurrence ) {
	echo $occurrence->setTimeZone(new DateTimeZone('America/Toronto'))->format('l jS F Y H:i:s e P'),"\n";
}

This will produce:

Saturday 10th March 2018 13:30:00 America/Toronto -05:00
Sunday 11th March 2018 14:30:00 America/Toronto -04:00
Monday 12th March 2018 14:30:00 America/Toronto -04:00
Tuesday 13th March 2018 14:30:00 America/Toronto -04:00

Does this answer your problem?

[morinluc0]

Yes it does answer my question, I will modify the my behavior to send in a UTC time.

Thank you for clearing up that confusion.