return Javascript Date object rather than string

Hi,

I have this object returned as:
events : [
            {
                "id":1,
                "start": Thu May 28 2012 14:00:00 GMT-0700 (Pacific Daylight Time),
                "end": Thu May 28 2012 15:00:00 GMT-0700 (Pacific Daylight Time),
                "title":"Lunch with Mike"
            },
            {
                "id":2,
                "start": Thu May 30 2012 16:00:00 GMT-0700 (Pacific Daylight Time),
                "end": Thu May 30 2012 18:30:00 GMT-0700 (Pacific Daylight Time),
                "title":"Dev Meeting"
            }]

But I need to return the "start" and "end" dates as:

events : [
            {
                "id":1,
                "start": new Date(year, month, day, 12),
                "end": new Date(year, month, day, 13, 30),
                "title":"Lunch with Mike"
            },
            {
                "id":2,
                "start": new Date(year, month, day, 14),
                "end": new Date(year, month, day, 14, 45),
                "title":"Dev Meeting"
            }]

How do I convert the string to the Date object? Is there an easy way? I'm drawing the "start" and "end" dates in the string format from the database.

Thanks,
Victor