Historical clue formulations

• When some local news airs — 2021-05-17
• When dinner may be served — 2019-07-03
• When a happy hour might start — 2018-11-18
• When the first dogwatch ends — 2014-02-28
• When some news airs — 2005-10-31
• When some watch the local news — 2005-06-04
• When dinner may be served — 1997-02-09