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Run results for:
Compare performance between Dayjs.tz and Temporal.ZonedDateTime
Get the end of month of an arbitrary month with both.
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<iframe src="https://measurethat.net/Embed?id=615147" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36
Browser:
Chrome 139
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
Create a Temporal.ZonedDateTime
182K/s
Create a Dayjs.tz
22K/s
View exact numbers
Test name
Executions per second
✓
Create a Temporal.ZonedDateTime
182,498 Ops/sec
Create a Dayjs.tz
21,945 Ops/sec
HTML Preparation code:
<script src="https://cdn.jsdelivr.net/npm/dayjs@1/dayjs.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/dayjs@1/plugin/timezone.js"></script> <script src="https://cdn.jsdelivr.net/npm/dayjs@1/plugin/arraySupport.js"></script> <script src="https://cdn.jsdelivr.net/npm/dayjs@1/plugin/utc.js"></script> <script src='https://cdn.jsdelivr.net/npm/temporal-polyfill@0.3.0/global.min.js'></script>
Script Preparation code:
dayjs.extend(window.dayjs_plugin_timezone); dayjs.extend(window.dayjs_plugin_arraySupport); dayjs.extend(window.dayjs_plugin_utc);
Tests:
Create a Dayjs.tz
dayjs.tz([2025, 7, 1], "Europe/London").endOf("month");
Create a Temporal.ZonedDateTime
const dt = Temporal.ZonedDateTime.from({ year: 2025, month: 8, day: 1, timeZone: "Europe/London" }); dt.with({ day: dt.daysInMonth, hour: 24, minute: 59, second: 59, millisecond: 999 });