Date problem. Flash not accepting date string

Hi
I cant get Flash to regonize this string "2007-01-16 19:45:00.0 GMT" as a date.

1. Tried this and got in the trace "Invalid time"
datestring = "2007-01-16 19:45:00.0 GMT";
var newdate:Date = new Date();
newdate.setTime(datestring );
trace(newdate);

2. Then I tried this and got again "Invalid time"
datestring = "2007-01-16 19:45:00.0 GMT";
var newdate:Date = new Date(datestring);
trace(newdate);