To and including: Wednesday, 25 November 2009, it is 1,160 days from the start date to the end date.
This is a variable number. You need to state a start and/or end date or time.
No; Sep 3 1991 was a Tuesday.
Nine times since 1949 counting this year.
Including the start and end dates in the calculation, there are 185 days between the two dates.