> I haven't thought much about it, but perhaps we can relax the all-day detection > in the incoming script so that it detects UTC, adds the device's current GMT > offset, and only then compares against 00:00-23:59. Patrick, syncclient_sample_config.xml has the code to implement this feature. see // - detect alldays in vCalendar 1.0 (0:00-0:00 or 23:59 localtime) i = ALLDAYCOUNT(DTSTART,DTEND,TRUE); if (ITEMDATATYPE()=="vCalendar10" && i>0) { // DTSTART and DTEND represent allday event, make them date-only values // - convert start to user zone (or floating) so it represents midnight DTSTART = CONVERTTOUSERZONE(DTSTART); MAKEALLDAY(DTSTART,DTEND,i); } However, as 'DTEND' set as 'AUTOENDDATE', like ddecock said, synthesis converts its value with user timezone before executing incoming script. DTSTART: 20060406T020000Z DTEND: 20060407T015959Z --> DTSTART: 20060406T020000Z DTEND: 20060407T000000Z This conversion causes the above script function 'ALLDAYCOUNT' returns 0 and it is not detected as an 'all-day-event'.