The Criminal Bar Association has insisted today's action will not jeopardise trials, but warned that future trials could be at risk if the issue was not resolved.
It has been careful to call the walk out a "non-attendance" rather than a strike.
There will also be protests outside courts in London, Manchester, Liverpool, Leeds, Birmingham, Newcastle, Winchester, Bristol and Cardiff.
The Bar Standards Board has warned that any barristers who stay away from court will almost certainly be in breach of their professional code of conduct with "very serious consequences".
More top news
We spring forward an hour at 1am on Sunday, to mark the start of British Summer Time.