About Julian Date
Julian Date is a free, fast and reliable online tool. Convert a date to a Julian day number. You can configure Date to get the result. Everything runs locally in your browser — no files are uploaded and no data is stored, keeping your information completely private. It works responsively on both desktop and mobile devices.
How to use Julian Date
- 1 Enter Date
- 2 Click "Convert"
- 3 Review the result and click "Copy"
Frequently asked questions
How do I use Julian Date?
Enter Date and the result is calculated instantly in your browser.
Is Julian Date free to use?
Yes — Julian Date is a free online tool. No sign-up or login is required, and there are no hidden charges or usage limits.
Do I need to create an account to use Julian Date?
No. Julian Date runs entirely online in your browser — there is no account to create, no login, and nothing to install.
Does Julian Date upload my data?
No. Everything runs locally in your browser. Your input never leaves your device, is never stored, and is never tracked, so it stays private.
Free, online, and private
Free to use
Julian Date is completely free. There is no account to create, no login, and no hidden charge or usage limit.
Runs online in your browser
It is a free online tool that runs entirely in your browser. Nothing to download or install — open the page and start using it right away.
Your data stays private
All processing happens locally on your device. Your input is never uploaded, stored, or tracked, so it never leaves your browser.