Exit date may not match airport intake form

I have a 10-year tourist L type entry permit with 60 days' validity per visit. When I landed in Beijing, I filled out the immigration intake form with my intended departure date for HK. Now I would like to stay an additional night in mainland China. I will be under 30 days total, so well under my visa max. I am just worried that when I submit my exit form, the date will be off by one day from what the first form said. Is this a problem?