Hi, would like to know the following:
If i miss the wonder date, can i buy two after 60 days or runs the clock only after i bought one.
Thanks.

No you can't.

You can only buy a wonder every 30 days after you've bought one.

So if you buy one on the 1st, you can buy another on the 31st or later, no earlier.

You cannot buy two wonders in the space of 30 days.

This may be would of been better in the Question Center here: http://forums.cybernations.net/index.php?showforum=16

Anyway, Ursarkar E Creed is right, the days don't add on to each other.