[Plugin: More Fields] Order by custom date field??

If I understand the documentation properly then its not possible. Surely I must be able to do this somehow. I have a custom date field I’ve used for a start date I want to order the posts by that date field in an ascending order??

Any ideas how I can do this? Hoping for a clean solution but I’ll do custom sql/query if need be.

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http://codex.wordpress.org/Function_Reference/query_posts#Orderby_Parameters

orderby=meta_value Note: A meta_key=keyname must also be present in the query. Note also that the sorting will be alphabetical which is fine for strings (i.e. words), but can be unexpected for numbers (e.g. 1, 3, 34, 4, 56, 6, etc, rather than 1, 3, 4, 6, 34, 56 as you might naturally expect).