Google calendar API v3 all day events from before timeMin

Question

I have the following events in my test google calendar:

All day event on the 20. February
Timed event on the 21. February from 10am till 11am

I do a request against the Google calendar API with the parameters timeMin = 2018-02-21T00:00:00+00:00 and timeMax = 2018-02-21T23:59:59+00:00. All is working fine when the calendar has the timezone UTC. Only the timed event is returned. But when I set the calendar timezone to something like "(GMT-06:00) Central Time" then the result does include also the all day event.

Is there a way to fetch the events ignoring the timezone for all day events? All day events are not bound to a timezone from my understanding and should not be included at anytime when the timeMin parameter is not from the day of the all day event.

All-day events effectively start at midnight. So in a way they are bound to the timezone - after all, midnight in one part of the world is not midnight in another part. So if your calendar has a timezone offset but your query parameter doesn't, then yeah your results may not be quite what you expected. — ADyson
Aggree with @ADyson, also I think you need to use a valid timeZone. e.g. (Europe/Andorra) if I understand it right. You can use try it in the documentation for testing. — MαπμQμαπkγVπ.0
If that would be the case, should then Google not offer for the all day event to set a timezone the same way as with timed events? Even in ics (ical) files you don't define a timezone for all day events. I can't find the link but in barely remember that I was reading somewhere in the past that all day events are not bound to a timezone. — Laoneo

Oussama Oussama · Accepted Answer · 2018-03-02T14:51:20

You just need to use timeZone param in your query and google will do the needed conversion

'timeZone' => 'your time zone'

$optParams = array(
        'maxResults' => $maxResults,
        'orderBy' => 'startTime',
        'singleEvents' => TRUE,
        'timeMin' => $timeMin,
        'timeMax' => $timeMax,
        'timeZone' => $timezone
        );

Google calendar API v3 all day events from before timeMin

1 Answers