Incorrect time using Calendar's "Ranged event"
 

I make the event in Calendar.
Open Calendar.
Click "Ranged Event".
Click "Choose time" (Start string).
Select "11:00".
Click "Choose time" (End string).
Select "18:00".
(Moscow time).
Write the Title* etc.
Click "Save event".

End see the time of my event:
"11:11" and "18:06"

Then:

C create trial account at the other host.
Create new MySQL base.
Install "clean" forum.
Try to create the event in Calendar. Works properly.

Then make MySQL base's dump at the first host and download it at my computer.
Import this dump to the new host.
Try to create the event in Calendar. And see the same error. Instead 11:00 and 18:00 I see "11:11" and "18:06".

In MySQL base I see the follow data in events and datastore tables: dataline_from is 1258279200 and dataline_to is 1258304400.

The hoster's support says that the problem is inside the vB scripts.
The vB support says that this is a server issue.

How no solve this trouble?