Historical clue formulations

• Fast-food chain with a sunrise in its logo — 2023-12-17
• Fast food chain whose name becomes another company when its last two letters are removed — 2023-05-13
• Fast-food chain with the slogan "UnFreshing Believable" — 2022-02-12
• Chipotle competitor — 2021-02-24
• Fast-food chain with the slogan "Unfreshing believable" — 2015-03-06