start-finish dates dont match duration

[kim279]

Hi -
I am baffled by this
I am inputting a new project and typing in tasks
this is an independent task - no dependancies
start date 09/02/12 duration 37 days
This should give a end date of 30/03/12
however it doesnt! to get this date I need to put in 42 days?!

I am baffled - its on standard calender, its definately days not edays, no publoc holidays
I just dont know why the number of days and dates dont match

Any ideas what I'm doing wrong?

Also no resources assigned to it yet

Thanks in advance
Kim