how to subtract a date form another date to have number of days

[era air]

1. i would like to know how to subtract date from another date to have dyas
2. how to calculate Expected date of Confinment using this formula ( +7 days, -3 months, +1 year) otherwise know as Naegele's Rule

thank you so much

[Taifun]

the methods to calculate with dates you can find in the clock component http://ai2.appinventor.mit.edu/reference/components/sensors.html#Clock

probably it would be easier to just add 40 weeks?

https://en.wikipedia.org/wiki/Naegele%27s_rule

Taifun

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Trying to push the limits of App Inventor! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun. 

[Abraham Getzler]

An interesting post!

Another example of how different applications need different ways to calculate date differences!

ABG