The following text has been quoted from Post :352696 .
In sentence #2 past participle opened is used as an adjective and in sentence #3 open is also used as an adjective. Right?
Please consider these comments.
1. The department store will open on Jan. 1 next year. This could simply mean that you can shop there on the New Year holiday.
2. The department store will be opened on Jan. 1 next year. This sounds like it's a new store that will commence business on Jan. 1.
3. You might also consider The department store will be open on Jan. 1, which could mean either #1 or #2.
Best wishes, Clive