Errors in Console Log Can't Parse Date Time

[ahalls]

2014-09-08 03:18:18.809 XbICalendar[35557:60b] Error: 93, Can't parse as DATE-TIME value in DTSTAMP property. Removing entire property: 19970901T1300Z
2014-09-08 03:18:18.811 XbICalendar[35557:60b] Error: 93, Can't parse as DATE-TIME value in DTSTAMP property. Removing entire property: 19970324T1200Z