Incorrect date created on photos

[AppleButterfly]

Hi all. Hope there is an easy solution to this. Bought a mac in march 2010 and copied over 3 months worth of new baby photos from my Nokia 6500 mobile phone. The exif data shows the photo creation and modified date as 17th march 2010 which is the date I copied over the photos. Problem is I know photos were taken before this. I don't have the Nokia phone anymore but photos I took on that phone and copied to an older windows computer are showing correct dates.

I only just noticed this as I was making albums of daughters 1st year but I can't figure when some of the photos are taken.

Is there a way around this? Thanks