The age calculator on the website sometimes gives an age that is slightly different than if I calculate by hand using the instructions in the User's Guide. Why does this occur?

Jul 30, 2018

1448

The age calculator on the website and in the app stores uses an actual calendar to calculate a child's age. It takes into account which months have 30 days and which months have 31 days, and therefore provides a more precise age calculation. For ease of use, the manual calculation described in the User's Guides assumes that every month has 30 days. Ages calculated by hand may have a difference of a couple of days from ages calculated with the calculator.