Date & Day Calculator
Enter one calendar date to see its weekday, weekend status, day of year, remaining days, and leap-year status in one view. This reads one date, not a date range or countdown.
Pick a date
Weekday result
A single date is easier to trust when the weekday and yearly position stay together
This page is not a date-range calculator. Pick one date and it shows the weekday, where that date sits in the year, and how many days remain until year-end.
Read the large weekday first, then use the day-of-year, week, remaining days, leap-year, ISO, and Unix values only when you need the extra detail.
When to use it
The screen is for reading one date quickly. Holidays and days between two dates belong in a different check.
- Adding both date and weekday to a schedule
- Checking whether a due date lands on a weekday
- Copying an ISO date into a document
Use it in screen order
The result updates without a calculate button. The recent-history block was removed so the workspace stays focused on the date and result.
- Choose the date in the input.
- Today, leap example, and random fill comparison dates.
- Use the mini calendar to compare nearby dates in the same month.
How to read the result
For 2024-02-29, the result is Thursday, day 60 / 366, 306 days left, leap year.
- Start with the large weekday badge.
- Use day-of-year and remaining days to understand the year position.
- Use ISO and Unix only for document or developer needs.
Basis and limits
ISO dates and Unix timestamps are supporting values for documents or developer notes. The weekday and day-of-year are calculated from the selected Gregorian date in the browser.
- Day of year counts January 1 as day 1.
- Leap year uses the 4/100/400-year rule.
- Confirm holidays, lunar dates, and legal deadlines with an official calendar.
FAQ
Do I need to press a calculate button?
No. The result updates as soon as the date input or mini calendar selection changes.
Is the week number the same as ISO week?
Not always. This tool uses a simple week count based on January 1 and the day of year.
How should I read the Unix timestamp?
It is the selected date at local midnight in the browser, converted to seconds. The number can differ across time zones.
Does it include holidays or lunar calendar dates?
No. It checks the weekday and year position for one Gregorian date. Use an official calendar for holidays, lunar dates, or legal deadlines.
How is this different from a date difference calculator?
This page reads one date. Use a date difference calculator when you need days between two dates or a date after a number of days.