Coca-Cola brand bottles are stamped (typically on the cap) with a sell-by date in MMDDYY format, and stamped (typically on the neck) with a sell-by date in MMMDDYY format. There may be additional codes included with the stamp on the neck that have nothing to do with dating.

What does it mean when you see a yellow cap on a Coca-Cola bottle?

kosher for Passover The yellow cap Coke is kosher for Passover If youre unfamiliar with Passover, its a Jewish religious holiday that occurs during spring and lasts for seven days in total. Because of this, Coke temporarily replaces the corn syrup in its recipe with sugar. This kosher Coke is marked with a sunny yellow cap!