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Picklist Administration - Manage Your Picklist Values
Use a formula to define a default picklist value
As an administrator, you want the default value for the macaron flavor to be the flavor of the month for some months, otherwise the default is vanilla.
Use the formula editor to set the Default Value for the Macaron Flavor picklist as follows: CASE(MONTH(TODAY()),1, "Gingerbread",2, "Strawberry",4, "Chocolate",7, "Raspberry",11, "Pumpkin",12, "Mint", "Vanilla")