How to create a custom Date field to save last public/private command Date?

[Pusker Ghimire]

I was looking on a way to trace tickets based on last public or private comment.

First i want to create a read only custom field to save current date from automation.
When i try to create a custom field, under type there isn't anything called "date" There is a "date picker" but not "date"

So my question here is, how can i create a custom read only field to save date programmatically, via automation?

I specifically need a Date field so i can create reports based on dates (not based on Text) any suggestions?

We are using Jira cloud.

[John Funk · Accepted solution]

Hi Pusker,

The Date Picker is indeed the Date type field - you should select that. 

You make the field read only by removing it from the Edit screen. 

[Pusker Ghimire]

Thank you @John Funk
I was able to make it work with you suggestion.