What are the doomsday dates for the odd months 5, 7, 9, and 11?

Remember "I work 9-to-5 at the 7-11": the pairs 5/9 & 9/5, and 7/11 & 11/7.

• May → 5/9, September → 9/5 ("9-to-5")
• July → 7/11, November → 11/7 ("7-11")

Each of these also lands on the year's doomsday. The mnemonic pairs a small month with a big day and vice-versa, so you get all four odd months from one phrase.