Can a employer end your tax year early?

I get paid weekly and I noticed that my check for hrs worked to the 27 dec have started a new tax year. I would expect them to be on my 2009 w2 since I never cut into jan during that week. I work for a struggling Business that could close its doors any min. Is there reason to cut it short to save them money right now b4 they close there doors. Also I thought it was weird that my check was like $115 before taxes for the check b4 and they only took out .01 for federal. If anyone knows the answers please inform me on why these last 2 checks have been so screwy. Ps they do go through an accountant to process there checks.