1433639 - DST not considered when creating events specifying a timezone

Status: UNCONFIRMED

(Calendar :: Provider: CalDAV, defect)

Description

[Eduardo Kalinowski]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0
Build ID: 20170909112443

Steps to reproduce:

I'm using a calendar synced via CalDAV to a Horde backend server.

The timezone "America/Sao Paulo" is ordinarily GTM-3, and when DST is active, it's GMT-2. This year, DST is active until February 18th.

I try to create an event on a day when DST is still active, for example February 13th, starting at 9:00 am, and set the timezone to America/Sao Paulo.


Actual results:

The event is created starting at 10:00 am.

Here's what stored in the backend (where the event times are stored in GMT along with the timezone):
+-------------+-------------------+---------------------+
| event_title | event_timezone    | event_start         |
+-------------+-------------------+---------------------+
| DST Test    | America/Sao_Paulo | 2018-02-13 12:00:00 |
+-------------+-------------------+---------------------+

If DST were not active, then 9:00 am local time would indeed be 12:00 pm GMT. But with DST active, as expected for that date, the GMT time should have been 11:00 am.


Expected results:

The proper offset for the timezone when DST is active should have been used, creating an event at 11:00 am GMT, which when converted back to local time is equivalent to the 9:00 am hour selected when creating the event.

Note that the conversion from GMT to local time is correct: an event starting at GMT 12:00 pm starts at 10:00 am local time (when DST is active); it's the conversion to GMT when the event is sent that is wrong.

If instead of a timezone I select "Local Time" when creating the event, everything works fine.

Comment 1

[Eduardo Kalinowski]

Attachment: Event creation window

Comment 2

[Eduardo Kalinowski]

Attachment: The event that is created

Comment 3

[Uwe Mock]

I might have the same problem.

I created an event on October 31st at 8:00. Today, I'm on CEST (CET with DST). On October 31st, I will be on CET (no DST). When I sync my event, it shows up as starting at 7:00 in other calendars. When I correct it to 8:00 in another calendar and sync back, Lightning shows it as starting at 9:00.

Comment 4

[Uwe Mock]

My Lightning version is 6.2.2.1 on TB 60.2.1 (64bit).

Comment 5

[Daniel]

Same problem here.