The "doubles": 4/4, 6/6, 8/8, 10/10, 12/12 — each even month has its doomsday on the day equal to the month number.

• April → 4/4
• June → 6/6
• August → 8/8
• October → 10/10
• December → 12/12

All five fall on the year's doomsday. They're the easiest to recall — month number repeated — so they're usually your go-to anchor for the second half of the year.

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.