My b2evolution Version: 2.x

I am getting this error message:

Warning: date() expects parameter 2 to be long, string given in /public_html/inc/_core/_misc.funcs.php on line 345

One of my pages uses a stub that has no min or max date so I can have posts showing from the past and future. A hunt on this site suggests that it may be due to daylight savings; my server is in Sydney and there is no time difference in my regional settings for my blog, but as all the other blog pages use different skins and normal date settings (show posts from past but not future), I think it's to do with the stub/time settings. I can't seem to figure out how to fix it though.

Any help would be very appreciated! Thanks!