A lot of users needs to transform dates and time values when presenting the values in their apps. Why not add a field type for Advanced Date/Time.
When you create that field you can first of all add if it should take Today and Now and default values when field is created. Then you can use to add X number to the year, month, week, day, hour, minute and second values and it will automatically calculate the new value.
So when a user submits a form I can have a field calculated so it will take the Today and Now when submission is done but the value that I want to store is + 5 days and then I just select Days in the dropdown and then enter integer 5 in the input field. So thats the value that will get stored.
I can also chose Formatting options here and select between all the formatting options that there is within dates and time. Or I can type in my own using free text field like YYYY-MM-DD and so on.
This field would lighten the burden for many people using Wix Code.