Govia Thameslink Railway, which runs the Southern and Thameslink franchises, has been embroiled in a row with union RMT over the future role of conductors for the several months.
Since the dispute started, high levels of staff sickness have led to widespread cancellations on a daily basis.
The rail operator confirmed on Tuesday (June 14) that the RMT plans a fresh walkout next week following similar days of industrial action in April and May.
The strike means there will be no Southern services at all running out of Hastings, St Leonards Warrior Square, Ore, Bexhill, Collington, Cooden Beach, Normans Bay, Rye, Winchelsea, Doleham and Three Oaks stations.
Southeastern services on the Hastings to Charing Cross line will be running as usual.
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