DateComparePerformanceTest.js

iters = 100000 # limit I reached on firefox: 500000
               # limit I reached on chrome : 125838

subsPerfTable = [];

[...Array(iters).keys()].forEach(() => {
    a = performance.now();
    "2020-08-10".substring(0,10) === "2020-08-10T00:00:55Z".substring(0,10);
    b = performance.now();
    subsPerfTable.push(b-a);
});


datePerfTable = [];
[...Array(iters).keys()].forEach(() => {
    a = performance.now();
    (new Date("2020-08-10").setHours(0,0,0,0)) === (new Date("2020-08-10T00:00:55Z").setHours(0,0,0,0));
    b = performance.now();
    datePerfTable.push(b-a);
});


console.log("substr");
console.log("Min:     ", Math.min(...subsPerfTab));
console.log("Max:     ", Math.max(...subsPerfTab));
console.log("Total:   ", subsPerfTable.reduce((a, b) => a + b));
console.log("Average: ", subsPerfTable.reduce((a, b) => a + b) / iters);
console.log("---------------------------------------------");
console.log("date");
console.log("Min:     ", Math.min(...datePerfTab));
console.log("Max:     ", Math.max(...datePerfTab));
console.log("Total:   ", datePerfTable.reduce((a, b) => a + b));
console.log("Average: ", datePerfTable.reduce((a, b) => a + b) / iters);
console.log("---------------------------------------------");