Date bug. (BB-4468)

Take local date back, example any date on 2009year.
Create commit.
Push commit.
Go to bitbucket and see what happened.
I dont know, can yo reproduce this or not , but my repo have a strange rollback with some not used merges and other strange things.

And more info:
Its maked some times ago, before this bug :
Create repo. Make some numbers of commit.
Wipe local repo. Push forced for applying changes and dotn loose commit history.

This is just git, i dont know about hg.