Log dialog: Date picker throws multiple error messages when date is before 1.1.1970

By har... on December 30, 2009 22:30 (imported from Google Code)

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What steps will reproduce the problem?

1. Show log
2. Set date 1.1.1970 in "From" date picker
3. Open the calendar view from the button
4. Click previous month

What is the expected output? What do you see instead?

Goto december 1969 or do nothing.

Instead it will display multiple error dialogs, caption 'TortoiseProc' and
message 'The parameter is incorrect'.

What version of the product are you using? On what operating system?

Windows XP. Tortoise GIT 1.2.1.0

Please provide any additional information below.