DateTimeZone construct error on login

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Hi all,

I'm about to migrate a website that I created in Concrete version 5.3.3.1 from one host to another. First I'm backing up the website on my local machine, that is a MAC running MAMP version 1.8.4. I've gone through the recommended procedure on moving a sitehttp://www.concrete5.org/documentation/installation/moving_a_site/,... however on my local machine backup version, whenever I log in to the concrete5 dashboard I get the following error:

Site Activity
An unexpected error occurred.
DateTimeZone::__construct() [datetimezone.--construct]: Unknown or bad timezone (localtime)

Someone had a similar problem here:http://www.concrete5.org/community/forums/customizing_c5/wrong_syst... but it doesn't solve my issue.

Does anyone know why I get this error message and a possible solution? Is it a problem with the database export? Thanks in advance.