Events shifted 1 hour with cPanel and Hong Kong Time

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  • A

    (Split from https://forums.bitfire.at/topic/1721/calendar-event-times-shifted/)

    I have the same problem, event time shifted by one hour earlier for every event created in Android.

    Events created in other platforms and sync to Android are correct.

    0
  • A

    @rfc2822
    I figured out the time shift of 1 hour occurred with the “Hong Kong” time zone. If I use China or Singapore time zone which are all GMT+8, the time will not shift.

    Please see whether you can reproduce the problem with Hong Kong time zone. The server is Cpanel.

    Thanks.

    0
  • rfc2822
    developer

    @andrew Seems to be a server thing. When creating an event for 15 Apr 2018 18:30:00 (Hong Kong), DAVdroid sends this event to the server:

    BEGIN:VEVENT
DTSTAMP:20180415T101259Z
UID:1961cf67-bd19-4be9-abaf-8ab6e4aa7d7b
SUMMARY:Test
DTSTART;TZID=Asia/Hong_Kong:20180415T183000
DTEND;TZID=Asia/Hong_Kong:20180415T193000
STATUS:CONFIRMED
END:VEVENT
BEGIN:VTIMEZONE
TZID:Asia/Hong_Kong
TZURL:http://tzurl.org/zoneinfo/Asia/Hong_Kong
X-LIC-LOCATION:Asia/Hong_Kong
BEGIN:STANDARD
TZOFFSETFROM:+073642
TZOFFSETTO:+0800
TZNAME:HKT
DTSTART:19041030T000000
RDATE:19041030T000000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0800
TZOFFSETTO:+0900
TZNAME:HKST
DTSTART:19410401T033000
RDATE:19410401T033000
RDATE:19460420T033000
RDATE:19470413T033000
RDATE:19480502T033000
RDATE:19490403T033000
RDATE:19500402T033000
RDATE:19510401T033000
RDATE:19520406T033000
RDATE:19530405T033000
RDATE:19540321T033000
RDATE:19550320T033000
RDATE:19560318T033000
RDATE:19570324T033000
RDATE:19580323T033000
RDATE:19590322T033000
RDATE:19600320T033000
RDATE:19610319T033000
RDATE:19620318T033000
RDATE:19630324T033000
RDATE:19640322T033000
RDATE:19650418T033000
RDATE:19660417T033000
RDATE:19670416T033000
RDATE:19680421T033000
RDATE:19690420T033000
RDATE:19700419T033000
RDATE:19710418T033000
RDATE:19720416T033000
RDATE:19730422T033000
RDATE:19731230T033000
RDATE:19750420T033000
RDATE:19760418T033000
RDATE:19790513T033000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0800
TZNAME:HKT
DTSTART:19410930T033000
RDATE:19410930T033000
RDATE:19450915T000000
RDATE:19461201T033000
RDATE:19471230T033000
RDATE:19481031T033000
RDATE:19491030T033000
RDATE:19501029T033000
RDATE:19511028T033000
RDATE:19521025T033000
RDATE:19531101T033000
RDATE:19541031T033000
RDATE:19551106T033000
RDATE:19561104T033000
RDATE:19571103T033000
RDATE:19581102T033000
RDATE:19591101T033000
RDATE:19601106T033000
RDATE:19611105T033000
RDATE:19621104T033000
RDATE:19631103T033000
RDATE:19641101T033000
RDATE:19651017T033000
RDATE:19661016T033000
RDATE:19671022T033000
RDATE:19681020T033000
RDATE:19691019T033000
RDATE:19701018T033000
RDATE:19711017T033000
RDATE:19721022T033000
RDATE:19731021T033000
RDATE:19741020T033000
RDATE:19751019T033000
RDATE:19761017T033000
RDATE:19791021T033000
END:STANDARD
BEGIN:STANDARD
TZOFFSETFROM:+0800
TZOFFSETTO:+0900
TZNAME:JST
DTSTART:19411225T000000
RDATE:19411225T000000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:HKST
DTSTART:19740421T033000
RDATE:19740421T033000
END:DAYLIGHT
END:VTIMEZONE

    The DST definitions are until 1979 only (when the DST has been eliminated in Hong Kong Time). So the given offset is +0800, so DTSTART;TZID=Asia/Hong_Kong:20180415T183000 is equivalent to 20180415T103000Z (10:30 UTC).

    However, the server immediately rewrites the event to

    BEGIN:VEVENT
DTSTART:20180415T093000Z
DTEND:20180415T103000Z
DTSTAMP:20180415T101313Z
UID:1961cf67-bd19-4be9-abaf-8ab6e4aa7d7b
CREATED:20180415T101259Z
LAST-MODIFIED:20180415T101259Z
SUMMARY:Test
CLASS:PUBLIC
STATUS:CONFIRMED
TRANSP:OPAQUE
END:VEVENT

    As you can see, the server uses DTSTART:20180415T093000Z which is

    1. without time zone information,
    2. at 9:30 UTC instead of 10:30 UTC.

    See also https://bugs.horde.org/ticket/13866 (cPanel is using Horde, as far as I know).

    Can you please report this to cPanel (guess it would be good to provide a link to this thread) and share the report URL here for tracking?

    0
  • A

    @rfc2822 thanks for the troubleshooting.

    I will report to cPanel, possibly via my hosting service provider, and keep everyone posted on the progress.

    E A 2 Replies 1
  • E

    Did the APK that rfc2822 sent you help the problem?

    A 1 Reply 0
  • A

    @executive said in Events shifted 1 hour with cPanel and Hong Kong Time:

    Did the APK that rfc2822 sent you help the problem?

    No, the problem still persists with that APK.

    0
  • A

    @andrew said in Events shifted 1 hour with cPanel and Hong Kong Time:

    @rfc2822 thanks for the troubleshooting.

    I will report to cPanel, possibly via my hosting service provider, and keep everyone posted on the progress.

    The following is the update from the hosting service provider.
    Dear customer,

    According to cPanel reply, the issues was relate to Horde:
    https://bugs.horde.org/ticket/13866

    Once Horde have resolve the issues, cPanel will including the fix in next cPanel update.

    You may consider to add the event at webmail for now.

    Thank you.

    1

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