From and including: Saturday, 24 March 2012
To, but not including : Sunday, 24 June 2012

It is 92 days from the start date to the end date, but not including the end date

Or 3 months excluding the end date

Alternative time units
92 days can be converted to one of these units:
7,948,800 seconds
132,480 minutes
2208 hours
13 weeks (rounded down)

It is 110 days from the start date to the end date, end date included

Or 3 months, 18 days including the end date

66 days?!