Convert Julian Calendar to Gregorian Calendar

Working with historical data or old calendar formats? The Convert Julian Calendar to Gregorian Calendar Tool helps you accurately convert dates from the Julian calendar into their Gregorian equivalents. Whether you’re studying timelines, documenting religious dates, or dealing with archived records, this tool offers fast and accurate conversion.

You can enter multiple dates, upload a file, and export the results with ease.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .log
Total dates: 0

How to Use:

  1. Enter one Julian date per line using the YYYY-MM-DD format into the Input Julian Dates box.
  2. Or click Choose File to import a .txt, .csv, or .log file.
  3. The Gregorian Calendar Dates output updates instantly.
  4. Click Copy Output to copy the results or Export to File to download them.
  5. Use Clear All to reset the input and output boxes.

What Convert Julian Calendar to Gregorian Calendar Tool can do:

  • Converts valid Julian dates into Gregorian equivalents based on historical shift logic:
    • 10 to 14 day shift depending on the century
  • Supports multiple entries
  • Flags invalid date formats clearly
  • Live output with result count and copy/export buttons
  • Demo output loads automatically on page load

Example:

Input:

2024-02-17
1999-12-19
1582-10-05
1900-12-18
2023-10-23

Output:

2024-02-17 → 2024-03-01
1999-12-19 → 2000-01-01
1582-10-05 → 1582-10-15
1900-12-18 → 1900-12-31
2023-10-23 → 2023-11-05

Common Use Cases:

This tool is ideal for researchers, historians, educators, or developers working with date systems prior to the adoption of the Gregorian calendar. It saves time and removes the complexity of manual date conversion, while ensuring accuracy across different historical timeframes.

Useful Tools & Suggestions:

If you’re working backward, Convert Gregorian Calendar to Julian Calendar switches it the other way. And once your date’s aligned, Convert a Date to a Julian Day gives you a clean number to work with.

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