wrong time sync in Lightning in Yahoo calendar

[pd1986]

I use Yahoo mail and calendar in my mobile and thunderbird under Linux system. However, the sync of event from Yahoo calendar is always wrong. For example, when I add one event in my mobile. In Yahoo calendar, I could see this event. However, when I sync the event in lightning. The time always starts at 11PM and ends at 11PM no matter what time I set the event in my mobile. Could anyone tell me the cause of this and how to solve it? Thanks.