Question

How to create a list of random dates in JavaScript

Answer 1

// Generate a random date between two years using Date
function randomDate(startYear, endYear) {

    // Convert start and end years to timestamps
    const start = new Date(startYear, 0, 1);   // January = 0
    const end   = new Date(endYear, 11, 31);   // December = 11

    const startTs = start.getTime();
    const endTs   = end.getTime();

    // Uniform distribution over the timestamp range
    const randomTs = Math.floor(Math.random() * (endTs - startTs + 1)) + startTs;

    // Convert back to Date
    return new Date(randomTs);
}

const dates = [];

for (let i = 0; i < 10; i++) {
    dates.push(randomDate(1990, 2030));
}

for (const d of dates) {
    console.log(`${d.getFullYear()}-${d.getMonth() + 1}-${d.getDate()}`);
}



/*
run:

1995-1-9
1993-1-6
1997-10-19
2030-7-2
2004-10-20
2022-2-27
1994-6-22
2008-7-13
2030-5-19
1990-7-3

*/

 

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