Julian Date Converter
Free Julian date converter. Convert between Julian Day Numbers, Modified Julian Date, and calendar dates. Used in astronomy, aviation, and military.
How to Convert Julian Dates
- 1 Choose conversion direction: Date to Julian or Julian to Date
- 2 Enter a calendar date and time, or a Julian Day Number
- 3 Click the appropriate Convert button
- 4 View Julian Day Number, Modified Julian Date, and Day of Year
- 5 Use Today or Now buttons for quick current time conversion
Frequently Asked Questions
Is my code or data stored anywhere? ▼
No. All developer tools process data locally in your browser. Nothing is sent to any server or logged.
Can I use these tools offline? ▼
Yes! After the initial page load, most developer tools work without an internet connection.
Are there API limits? ▼
No limits. Since processing happens in your browser, you can use the tools as much as you need.
Is the output compatible with production use? ▼
Yes. Our tools produce standard-compliant output suitable for production environments.
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Last updated: January 15, 2026 · v2.1