My Chinese L visa (mulitple entry) duration for stay given is 30 days

It is counted 31 days if you arrive Shanghai on 17th Sep. and depart Shanghia on 17th Oct. 2011. The stay duration is counted from the date of entry.

i just realise i mistaken count as 30 infact is actually 31 days stay in china..

My visa duration of stay 30days..& my ticket already bought..entry on sep 17; out oct 17..do I need to extend visa since is only 1 day different .. is that anyway to extend? or can I. request custom officer to extend on my arrival ?

Sheryl, please don't worry, one day overstay is not serious, the immigration officer won't punish you, maybe he/she just gives you a warning when you exit China on Oct.17.