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Problem importing ics for: "LAST-MODIFIED:00010101T000000Z" and "DTSTAMP:00010101T000000Z" #1523

Description

@nipsgur

Hi all,

When I subscribe an ics with "Add calendar from link" and there is an entry that has LAST-MODIFIED:00010101T000000Z I get into trouble.
The Problem is that the imported data can't be completely synced over activesync to remote devices. It ends in a infinite sync loop with sync attempts every 5 seconds. (This drains the battery of the remote devices)

I can't say, if this is a problem when importing the ics file or an problem of activesync, but it happens reproducible for entries in the ics, that have that strange LAST-MODIFIED:00010101T000000Z

The entry in the ics file typically look like this:


BEGIN:VALARM
TRIGGER:-PT1H
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
BEGIN:VEVENT
LAST-MODIFIED:00010101T000000Z
DTSTAMP:00010101T000000Z
LOCATION:See entry for details 👇
X-ECAL-SCHEDULE:
DTSTART:20260619T061500Z
DTEND:20260619T064500Z
SUMMARY: event description
TRANSP:TRANSPARENT
SEQUENCE:0
UID:6a2fd3cb54aa884cc83a7d50
PRIORITY:5
X-MICROSOFT-CDO-IMPORTANCE:1
CLASS:PUBLIC
DESCRIPTION: event description

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