New error in logs: Windows date support

Hi!

I'm using the latest SVN of Roundcube on Windows with PHP5.

I've started getting the following message in my errors log, it appears since about June 19th. There are 2 line variations:

[13-Jul-2006 12:06:56] PHP Warning: date(): Windows does not support dates prior to midnight (00:00:00), January 1, 1970 in <snip>\program\include\main.inc on line 1523

[13-Jul-2006 12:06:56] PHP Warning: date(): Windows does not support dates prior to midnight (00:00:00), January 1, 1970 in <snip>\program\include\main.inc on line 1567

If this something that needs to be fixed, or just something I should set my error level to ignore? I realize it is just a warning...

Thanks!

Andrew