https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=5456 --- Comment #7 from Marc Véron <veron@veron.ch> --- Hi Jonathan, I tested Magnus' newest patch again (with 2 checkouts), that's what I get: BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.21 BEGIN:VEVENT DESCRIPTION:Your copy of Pfützen schreien so laut ihr Licht (barcode glaupf u-01) is due back at the library today DTSTAMP:20160725T185113Z DTSTART:20160725T215900Z SUMMARY:Pfützen schreien so laut ihr Licht is due UID:issue-9@ END:VEVENT BEGIN:VEVENT DESCRIPTION:Your copy of Der Rattenkönig : (barcode rakoe-01) is due back a t the library today DTSTAMP:20160725T185113Z DTSTART:20160725T215900Z SUMMARY:Der Rattenkönig : is due UID:issue-10@ END:VEVENT END:VCALENDAR If I pass it through http://icalendar.org/validator.html#results, it gives no errors (warnings though about the length of 2 lines). I can import it to Thunderbird Calendar without problem, and Thunderbird shows what I expect regarding time (25.07.2016 23:59 local time) -- You are receiving this mail because: You are watching all bug changes. You are the QA Contact for the bug.