Image to remember how many days a month has. This pattern also correlates to the white & black keys of the twelve notes in the musical scale on a piano.
An alternative hand mnemonic for the months in the Gregorian calendar is here:
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Knuckle mnemonic for the number of days in each month of the Gregorian Calendar.
„Kloubová“ mnemotechnická pomůcka pro počet dní v jednotlivých měsících gregoriánského kalendáře. Každý kloub představuje měsíc o 31 dnech. Když jsme byli malí, kontrolovali jsme takto konce měsíců.