On an average, expected date of delivery is calculated by adding 280 days to the first day of the last menstural period for a cycle duration of 28 days. This is 10 lunar months. A lunar months is 28 days. It is also 40 weeks. Because the number of days in a standard Christian calender varies from 28 to 31, only an approximate value of 9 months and 7 days is given. Assuming 30-day months, then it would be 9 months and 10 days.

The server's time is: 5:14:58 AM.
The server's Date is: 9/5/2010.

First Day of Last Menstrual Period: mm/dd/yyyy

Period Cycle: Range 20-45 days