Date Difference Calculator
More commonly referred to as "Days between dates" calculator, You can you this online tool to find number of months or weeks or days between any two dates.
Sample Calculation for date difference between 1981-05-05 and 2014-09-15
The date difference is 33 years 4 months 10 days
Date interval in months: 400 months 10 days
Date interval in weeks: 1740 weeks 6 days
Date interval in days: 12186 days