Help with data manipulation

[LucasIsidoro]

Good morning people,

I have an initial date / time, I have the time to produce a certain item. However I wanted to have this field as marked (in red) in the image.

This date / time initially does not exist in the database, but using the initial date / time + production time, is it possible for me to be able to create this data? Note that the sum of these hours as the days result in the running time.

I am a beginner in the tool, and I am not able to create a solution for this case. Thanks in advance.

Thank you.