No upload, 100% local, no account

Date details

Pick a date to see everything about it at a glance.

How Date details works

Date details is the all-in-one overview of a single calendar date. In one place it gives you the weekday, the ISO-8601 week number, the calendar quarter, the day of the year, whether the year is a leap year, the zodiac sign and more, the page to reach for when you don't yet know which specific fact you need.

If you only want one of those answers, Sunasty also has a dedicated, focused tool for each: the day of the week, the ISO week number, the quarter of a date, or a leap-year checker. This page simply gathers them into one quick snapshot, the better starting point when you want the full profile rather than a single value.

Frequently asked questions

How is this different from the day-of-week or week-number tools?

Those each answer one precise question and are ideal when you know exactly what you need. Date details runs every calculation at once and shows the full picture, so it is the better starting point when you want a complete overview rather than a single value.

Which facts does it show for a date?

Weekday, day of the year, ISO-8601 week number and week-year, calendar quarter, leap-year status and the zodiac sign, among others, all derived locally from the date you pick.

Is the date I enter sent anywhere?

No. Every value is computed in your browser, on your device. The date you enter never leaves your machine and nothing is stored between visits.

Does it work offline?

Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.

Is it free? Do I need an account?

It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.