Sometimes I find some cheap flight tickets from Stockholm to Beijing and Shanghai. I know a Swede must have a visa for touristing in China but I don't know when I'd like to go as these cheap tickets aren't availabe all the time (a very special price code).

Can you get a Chinese visa without an arrival date?

The site visaforchina.org says I should submit arrival and departure dates as Supporting Documents - something I can't do as I can only say "within the next 6 months, less than 30 days stay".

I'd also like to be able to go there many times so a multi-entry visa for 1 year or so would be perfect.