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1. Editing node.
2. Saving node
Data From date is: 16 February 2009
Data To date is: 16 February 2009
Data From date is invalid. Data To date is invalid.
Probably it's related to different language.
When I'm choosing the date from popup calendar I've got: 16 luty 2009 instead of 16 February 2009
And then when I'm replacing it, it's working.