Analyze a Calendar Date
Report weekday, day-of-year, ISO week, leap year, zodiac sign, and season for a date. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Analyze a Calendar Date
- 1. Paste a calendar date. Enter a date in YYYY-MM-DD form into the input pane. The tool immediately works out the weekday, day of year, ISO week, quarter, and related facts about that single day.
- 2. Toggle zodiac and season. Turn on Show zodiac sign to append the astrological sign for that date, and Show season (northern hemisphere) to see which of the four seasons the date falls in.
- 3. Read the breakdown. The output lists weekday, day of year, ISO week number, quarter, days in that month, and whether the year is a leap year, all computed directly from the date you entered.
When to use Analyze a Calendar Date
Analyze a Calendar Date reports the weekday, day-of-year, ISO week, leap year status, zodiac sign, and season for any date you give it. Reach for it whenever a single date needs to be understood in full rather than just displayed.
- Filling in a report header. You need to write 'week 29 of 2026' at the top of a status report and want the exact ISO week number for today's date without counting weeks by hand on a calendar.
- Debugging a fiscal calendar bug. A billing system computes quarters incorrectly near year boundaries. Checking a date's day-of-year and quarter here confirms what the correct values should be before you fix the calculation.
- Planning around a birthday. You want to know the zodiac sign and season for a friend's birthday to write a more personal card, without looking it up across separate reference pages.
Examples
A summer Tuesday
Input
2026-07-14
Output
2026-07-14 Weekday: Tuesday Day of year: 195 ISO week: 29 Quarter: Q3 Days in month: 31 Leap year: no Zodiac: Cancer Season: Summer
About the Analyze a Calendar Date tool
Analyze a Calendar Date is a free online tool that works entirely inside your web browser. Report weekday, day-of-year, ISO week, leap year, zodiac sign, and season for a date. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 90 Time utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with 2 settings, including Show zodiac sign and Show season (northern hemisphere), and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Analyze a Calendar Date free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.