I can list the number of PRs for the year made in git in the github PR web page by adding the filter as below
is:pr created:>2020-01-01
How can I do that in the command line?
There is no Git command to do this because GitHub pull requests are not a feature of Git.
There is a command-line interface for GitHub, it has a command gh pr list
which is supposed to list the pull requests based on different criteria.
Currently the documentation lists these options:
-a, --assignee string Filter by assignee
-B, --base string Filter by base branch
-l, --label strings Filter by labels
-L, --limit int Maximum number of items to fetch (default 30)
-s, --state string Filter by state: {open|closed|merged|all} (default "open")
-w, --web Open the browser to list the pull requests
So it seems there is no possibility to filter the pull requests by date, either.