In [my previous post](https://superuser.com/questions/472214/how-to-save-a-ntfs-partition-which-suddenly-became-empty), I mentioned I was hit by a complete data loss on a ntfs partition shared by Windows 7 and Ubuntu 12.04, for some unclear reason.

A strange thing happened at the same time is that the time shown by both OSes were changed to be 4 hours in advance at the same time when data loss happened.

1. In Ubuntu, I wanted to change the time back to normal (EDT). To my
surprise, I found the settings are:

```
Location: New York 
Set the time: Automatically from the internet

```

The location is correct for EDT, and I have always been having
internet connection. Just don't understand why the time is 4 hours
in advance?
2. What might possibly be the reason that the time change happened to
both OSes instead of just Windows, when data loss happened during
rebooting from Windows into Ubuntu?

Thanks!