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Determine whether a date is jolly.
Determine whether a date is jolly
If no date is provided, the current date is checked.
npm install is-jollyimport isJolly from 'is-jolly';
console.log(isJolly());
// true or false, depending on the jollyiness of the current date
console.log(isJolly(new Date('1/3/2000')));
// false