Create a date field that auto calculates based on another date field

[RDJHUD]

I am setting up a CDS entity for an app I'm creating.  I have several date fields that I'm putting in statically, but I have some date fields that will need to be calculated off of another field.  So, I create Field A in my entity and it's a date picker.  I then need to create another field that automatically calculates 120 days after the date selected in Field A.  Is there a way to do this?  I have seen references to some ways that have to do with coding, but honestly I'm new to Power Apps and CDS, so I'm not sure where to begin actually inserting that coding as I don't see any "custom" fields that accept the coding.  I'm probably missing something when it comes to that, so forgive my ignorance.  I have no problem coding, I studied coding in college and have done minor coding projects, but I am NOT a developer...which is why I like the "low code" environment here.

Thanks, 
Randy

[ChrisPiasecki · Accepted solution]

Hi @RDJHUD,

A calculated field should do the trick. In the Action, the expression would use the date function:

ADDDAYS(120, 'Field A')

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[EricRegnier · Accepted solution]

Hi @RDJHUD, 

EDIT: I didn't see @ChrisPiasecki post. It is the same as mine, so please discard this.

You can also do this out-of-the-box with calculated fields which I recommend to simplify your app's logic and ability to use it for future needs if required. Here's an example (replace createdon with field A):

Hope this helps!

[RDJHUD]

Thanks to both of you.  I think I was going about this all wrong.  I was trying to do this all in the actual CDS entity, not in the canvas app.  But, now that I think about it and your input it makes sense.  Your input will help me once I move on to making the app. Thanks!  Randy