RRULE DTSTART Ignores timezone setting on calendar and assumes UTC + testcase

[ganySA]

Reduced Test Case

Test Case
https://codesandbox.io/s/fullcalendar-z-char-issue-forked-06fw0?file=/src/RRuleDemo.js

Bug Description

When interpreting DTSTART it ignores timezone setting on calendar and seems to interpret as UTC.

Background
Database: time saved as UTC.
Fullcalendar: timezone specified as per a database value in my case 'Africa/Johannesburg'.
Luxon library used.

The data in my database is UTC and this works perfectly for normal events the calendar converts them correctly to the correct timezone.

What does RRULE show
Below is my RRULE (7am in UTC)
FREQ=DAILY;INTERVAL=1;DTSTART=20201021T070000Z

When i take the above and use RRULE as follows:

  const rule = RRule.fromString(`FREQ=DAILY;INTERVAL=1;DTSTART=20201021T070000Z` );
  console.log(rule); 

The time is correctly displayed by RRULE as (9am):
Wed Oct 21 2020 09:00:00 GMT+0200 (South Africa Standard Time)

What does the calendar show
When i specify the RRULE string on the fullcalendar object exactly as above displays it 7am. This is UTC and not the timezone of the calendar.
It seems that it is interpreting RRULEs as if the calendar were in UTC mode and not using the timezone.

[ganySA]

Yes? No? Maybe?

[acerix]

I believe this existing ticket captures this need:
#5273
↑
Please visit the above issue, give a 👍 to vote (?), press the 🔈Subscribe button to receive updates.