Tool to calculate expected hatch dates

[bel]

http://timeanddate.com/date/dateadd.html

This is a date add tool from timeanddate.com you put in a date, then how many days to add or subtract and it will tell you the answer.

 

[chickenwhisperer]

I just use a calendar . . .
It has big numbers, and if I move 21 squares forward, I can find my hatch date!

Edit- I just used the link, and looks like the calendar was right