Change timestamps on image file from iPhone

[jtabc123]

I used exiftool to extract the metadata from a picture from an iPhone X.
There are several fields in here that I need to change, but I don't understand how to access them to do so. I want to change all of the following fields:

Code Select Expand

[IFD0]          Modify Date
[ExifIFD]       Date/Time Original
[ExifIFD]       Create Date
[ExifIFD]       Offset Time
[ExifIFD]       Offset Time Original
[ExifIFD]       Offset Time Digitized
[Composite]     Create Date
[Composite]     Date/Time Original
[Composite]     Modify Date

to a given date and time.

Any idea how to do this? The example I tried did not modify the file, presumably because I was using the wrong name to access these fields.

[Phil Harvey]

I think that reading FAQs 2 and 3 will help you to figure this out.

- Phil